GridView代码分页保存分页CheckBox的状态
GridView选中，编辑，取消，删除
GridView正反双向排序
GridView和下拉菜单DropDownList结合
GridView和CheckBox结合
鼠标移到GridView某一行时改变该行的背景色方法一
鼠标移到GridView某一行时改变该行的背景色方法二
GridView实现删除时弹出确认对话框
GridView实现自动编号
GridView实现自定义时间货币等字符串格式
GridView实现用“”代替超长字符串
GridView一般换行与强制换行
GridView显示隐藏某一列
GridView弹出新页面/弹出新窗口
GridView固定表头(不用javascript只用CSS，2行代码，很好用)
GridView合并表头多重表头无错完美版（以合并3列3行举例）
GridView突出显示某一单元格（例如金额低于多少，分数不及格等）
GridView加入自动求和求平均值小计
GridView数据导入Excel/Excel数据读入GridView

1.GridView代码分页排序：

效果图：

1.AllowSorting设为True，aspx代码中是AllowSorting="True"；
2.默认1页10条，如果要修改每页条数，修改PageSize即可，在aspx代码中是PageSize="12"。
3.默认的是单向排序的，右击GridView弹出“属性”，选择AllowSorting为True即可。

1：分页保存选中状态

保存CheckBox的值

 GridView在分页过程中并不维护CheckBox的选择状态，幸运的是，我们可以使用Session来维护CheckBox的状态，这个功能使用RememberOldValues完成

private void RememberOldValues()

    {

        ArrayList categoryIDList = new ArrayList();

        int index = -1;

        foreach (GridViewRow row in okZMGV.Rows)

        {

            index =Convert .ToInt32( okZMGV.DataKeys[row.RowIndex].Value);

            bool result = ((CheckBox)row.FindControl("IsCheckBox")).Checked;

            // Check in the Session

            if (Session["state"] != null)

                categoryIDList = (ArrayList)Session["state"];

            if (result)

            {

                if (!categoryIDList.Contains(index))

                    categoryIDList.Add(index);

            }

            else

                categoryIDList.Remove(index);

        }

        if (categoryIDList != null && categoryIDList.Count > 0)

            Session["state"] = categoryIDList;

}

还原CheckBox的状态

   下一步，需要定义一个方法来还原Checkbox的状态值

    private void RePopulateValues()

    {

        ArrayList categoryIDList = (ArrayList)Session["state"];

        if (categoryIDList != null && categoryIDList.Count > 0)

        {

            foreach (GridViewRow row in okZMGV .Rows)

            {

                int index = (int)okZMGV.DataKeys[row.RowIndex].Value;

                if (categoryIDList.Contains(index))

                {

                    CheckBox myCheckBox = (CheckBox)row.FindControl("IsCheckBox");

                    myCheckBox.Checked = true;

                }

            }

        }

    }

最后，在分页事件里调用上面两个方法

protected void page_Click(object sender, ImageClickEventArgs e)

    {

        RememberOldValues();

        string count = ((ImageButton)sender).CommandArgument.ToString().ToLower ();

        switch(count)

        {

            case "prev":

                if (okZMGV.PageIndex > 0)

                {

                    okZMGV.PageIndex -= 1;

                }

                break;

            case "next":

                if (okZMGV.PageIndex < okZMGV.PageCount - 1)

                {

                    okZMGV.PageIndex += 1;

                }

                break;

            case "0":

                   okZMGV.PageIndex=0;

break;

case "last":

okZMGV.PageIndex= okZMGV.pagecount-1;

break;

        }

        BrndOKBind();

        RePopulateValues();

    }

2.GridView选中，编辑，取消，删除：

效果图：

后台代码：
你可以使用sqlhelper,本文没用。代码如下：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{

//清清月儿http://blog.csdn.net/21aspnet
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=(local);Database=数据库名;Uid=帐号;Pwd=密码";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();
        }
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        bind();
    }

//删除
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string sqlstr = "delete from 表 where id=''" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
        sqlcon = new SqlConnection(strCon);
        sqlcom = new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        bind();
    }

//更新
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "update 表 set 字段1=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "'',字段2=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).Text.ToString().Trim() + "'',字段3=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "'' where id=''"
            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
        sqlcom=new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        GridView1.EditIndex = -1;
        bind();
    }

//取消
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        bind();
    }

//绑定
    public void bind()
    {
        string sqlstr = "select * from 表";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "表");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "id" };//主键
        GridView1.DataBind();
        sqlcon.Close();
    }
}

3.GridView正反双向排序：
效果图：点姓名各2次的排序，点其他也一样可以。

后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class Default3 : System.Web.UI.Page
{

//清清月儿的博客http://blog.csdn.net/21aspnet
    SqlConnection sqlcon;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState["SortOrder"] = "身份证号码";
            ViewState["OrderDire"] = "ASC";
            bind();
        }
    }
    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {
        string sPage = e.SortExpression;
        if (ViewState["SortOrder"].ToString() == sPage)
        {
            if (ViewState["OrderDire"].ToString() == "Desc")
                ViewState["OrderDire"] = "ASC";
            else
                ViewState["OrderDire"] = "Desc";
        }
        else
        {
            ViewState["SortOrder"] = e.SortExpression;
        }
        bind();
    }

4.GridView和下拉菜单DropDownList结合：

效果图：

后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class Default4 : System.Web.UI.Page
{
    SqlConnection sqlcon;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        DropDownList ddl;
        if (!IsPostBack)
        {
            string sqlstr = "select top 5 * from 飞狐工作室";
            sqlcon = new SqlConnection(strCon);
            SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
            DataSet myds = new DataSet();
            sqlcon.Open();
            myda.Fill(myds, "飞狐工作室");
            GridView1.DataSource = myds;
            GridView1.DataBind();
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                DataRowView mydrv = myds.Tables["飞狐工作室"].DefaultView[i];
                if (Convert.ToString(mydrv["员工性别"]).Trim() == "True")
                {
                    ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");
                    ddl.SelectedIndex = 0;
                }
                if (Convert.ToString(mydrv["员工性别"]).Trim() == "False")
                {
                    ddl = (DropDownList)GridView1.Rows[i].FindControl("DropDownList1");
                    ddl.SelectedIndex = 1;
                }
            }
            sqlcon.Close();
        }
    }
    public SqlDataReader ddlbind()
    {
        string sqlstr = "select distinct 员工性别 from 飞狐工作室";
        sqlcon = new SqlConnection(strCon);
        SqlCommand sqlcom = new SqlCommand(sqlstr, sqlcon);
        sqlcon.Open();
        return sqlcom.ExecuteReader();
    }

5.GridView和CheckBox结合：

效果图：

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class Default5 : System.Web.UI.Page
{
//清清月儿http://blog.csdn.net/21aspnet
    SqlConnection sqlcon;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();
        }
    }
    protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
    {
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
        {
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
            if (CheckBox2.Checked == true)
            {
                cbox.Checked = true;
            }
            else
            {
                cbox.Checked = false;
            }
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        SqlCommand sqlcom;
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
        {
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
            if (cbox.Checked == true)
            {

                string sqlstr = "delete from 飞狐工作室 where 身份证号码=''" + GridView1.DataKeys[i].Value + "''";
                sqlcom = new SqlCommand(sqlstr, sqlcon);
                sqlcon.Open();
                sqlcom.ExecuteNonQuery();
                sqlcon.Close();
            }
        }
        bind();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        CheckBox2.Checked = false;
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
        {
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
            cbox.Checked = false;
        }
    }
    public void bind()
    {
        string sqlstr = "select top 5 * from 飞狐工作室";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "tb_Member");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "身份证号码" };
        GridView1.DataBind();
        sqlcon.Close();
    }
}

前台主要代码：

6.鼠标移到GridView某一行时改变该行的背景色方法一：

效果图：

做法：
双击GridView的OnRowDataBound事件；
在后台的GridView1_RowDataBound()方法添加代码，最后代码如下所示：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        int i;
        //执行循环，保证每条数据都可以更新
        for (i = 0; i < GridView1.Rows.Count; i++)
        {
            //首先判断是否是数据行
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //当鼠标停留时更改背景色
                e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor=''#00A9FF''");
                //当鼠标移开时还原背景色
                e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
            }
        }

    }

7.鼠标移到GridView某一行时改变该行的背景色方法二：

效果图：

做法：和上面的一样就是代码不同
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        //int i;
        ////执行循环，保证每条数据都可以更新
        //for (i = 0; i < GridView1.Rows.Count; i++)
        //{
        //    //首先判断是否是数据行
        //    if (e.Row.RowType == DataControlRowType.DataRow)
        //    {
        //        //当鼠标停留时更改背景色
        //        e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor=''#00A9FF''");
        //        //当鼠标移开时还原背景色
        //        e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
        //    }
        //}
        //如果是绑定数据行
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //鼠标经过时，行背景色变
            e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor=''#E6F5FA''");
            //鼠标移出时，行背景色变
            e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=''#FFFFFF''");
        }

    }

8.GridView实现删除时弹出确认对话框：

效果图：

实现方法：
双击GridView的OnRowDataBound事件；
在后台的GridView1_RowDataBound()方法添加代码，最后代码如下所示：

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        //如果是绑定数据行
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
             if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
            {
                ((LinkButton)e.Row.Cells[6].Controls[0]).Attributes.Add("onclick", "javascript:return confirm(''你确认要删除：\"" + e.Row.Cells[1].Text + "\"吗?'')");
            }
        }

    }

9.GridView实现自动编号：

效果图：

实现方法：
双击GridView的OnRowDataBound事件；
在后台的GridView1_RowDataBound()方法添加代码，最后代码如下所示：
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        //如果是绑定数据行 //清清月儿http://blog.csdn.net/21aspnet
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            ////鼠标经过时，行背景色变
            //e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor=''#E6F5FA''");
            ////鼠标移出时，行背景色变
            //e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=''#FFFFFF''");

            ////当有编辑列时，避免出错，要加的RowState判断
            //if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
            //{
            //    ((LinkButton)e.Row.Cells[6].Controls[0]).Attributes.Add("onclick", "javascript:return confirm(''你确认要删除：\"" + e.Row.Cells[1].Text + "\"吗?'')");
            //}

        }
        if (e.Row.RowIndex != -1)
        {
            int id = e.Row.RowIndex + 1;
            e.Row.Cells[0].Text = id.ToString();
        }

    }

注意这时最好把前台的第一列的表头该为“编号”，因为以前的第一列被“吃掉”了。
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="3" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing"
                        OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px" OnRowDataBound="GridView1_RowDataBound">
                        <FooterStyle BackColor="White" ForeColor="#000066" />
                        <Columns>
                            <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />
                            <asp:BoundField DataField="姓名" HeaderText="用户姓名" />
                            <asp:BoundField DataField="员工性别" HeaderText="性别" />
                            <asp:BoundField DataField="家庭住址" HeaderText="家庭住址" />
                            <asp:CommandField HeaderText="选择" ShowSelectButton="True" />
                            <asp:CommandField HeaderText="编辑" ShowEditButton="True" />
                            <asp:CommandField HeaderText="删除" ShowDeleteButton="True" />
                        </Columns>
                        <RowStyle ForeColor="#000066" />
                        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
                        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
                    </asp:GridView>

10.GridView实现自定义时间货币等字符串格式：

效果图：
图1-未格式化前

图2-格式化后

解决方法：
在asp.net 2.0中，如果要在绑定列中显示比如日期格式等，如果用下面的方法是显示不了的

<asp :BoundField DataField="CreationDate"
DataFormatString="{0:M-dd-yyyy}"
HeaderText="CreationDate" />

主要是由于htmlencode属性默认设置为true,已防止XSS攻击，安全起见而用的，所以，可以有以下两种方法解决

1、

<asp :GridView ID="GridView1" runat="server">
<columns>
<asp :BoundField DataField="CreationDate"
DataFormatString="{0:M-dd-yyyy}"
HtmlEncode="false"
HeaderText="CreationDate" />
</columns>
</asp>

将htmlencode设置为false即可

另外的解决方法为，使用模版列

<asp :GridView ID="GridView3" runat="server" >
<columns>
<asp :TemplateField HeaderText="CreationDate" >
<edititemtemplate>
<asp :Label ID="Label1" runat="server"
Text=''<%# Eval("CreationDate", "{0:M-dd-yyyy}") %>''>
</asp>
</edititemtemplate>
<itemtemplate>
<asp :Label ID="Label1" runat="server"
Text=’<%# Bind("CreationDate", "{0:M-dd-yyyy}") %>''>
</asp>
</itemtemplate>
</asp>
</columns>
</asp>

前台代码：
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="身份证号码"
            DataSourceID="SqlDataSource1" AllowSorting="True" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="3" Font-Size="12px" OnRowDataBound="GridView1_RowDataBound">
            <Columns>
                <asp:BoundField DataField="身份证号码" HeaderText="身份证号码" ReadOnly="True" SortExpression="身份证号码" />
                <asp:BoundField DataField="姓名" HeaderText="姓名" SortExpression="姓名" />
                <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" SortExpression="邮政编码" />
                <asp:BoundField DataField="出生日期" HeaderText="出生日期" SortExpression="出生日期" />
                <asp:BoundField DataField="起薪" HeaderText="起薪" SortExpression="起薪" />
            </Columns>
            <FooterStyle BackColor="White" ForeColor="#000066" />
            <RowStyle ForeColor="#000066" />
            <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
            <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:北风贸易ConnectionString1 %>"
            SelectCommand="SELECT top 5 [出生日期], [起薪], [身份证号码], [姓名], [家庭住址], [邮政编码] FROM [飞狐工作室]" DataSourceMode="DataReader"></asp:SqlDataSource>

附录-常用格式化公式：
{0:C}  货币；
{0:D4}由0填充的4个字符宽的字段中显示整数；
{0:000.0}四舍五入小数点保留第几位有效数字；
{0:N2}小数点保留2位有效数字；{0:N2}%   小数点保留2位有效数字加百分号；
{0:D}长日期；{0:d}短日期；{0:yy-MM-dd}   例如07-3-25；；{0:yyyy-MM-dd}  例如2007-3-25

 11.GridView实现用“”代替超长字符串：

效果图：

解决方法：数据绑定后过滤每一行即可
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
        {
            DataRowView mydrv;
            string gIntro;
            if (GridView1.PageIndex == 0)
            {
                mydrv = myds.Tables["飞狐工作室"].DefaultView[i];//表名
                gIntro = Convert.ToString(mydrv["家庭住址"]);//所要处理的字段
                GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
            }
            else
            {
                mydrv = myds.Tables["飞狐工作室"].DefaultView[i + (5 * GridView1.PageIndex)];
                gIntro = Convert.ToString(mydrv["家庭住址"]);
                GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
            }
        }

调用的方法：

    public string SubStr(string sString, int nLeng)
    {
        if (sString.Length <= nLeng)
        {
            return sString;
        }
        string sNewStr = sString.Substring(0, nLeng);
        sNewStr = sNewStr + "";
        return sNewStr;
    }

后台全部代码：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

            ////当有编辑列时，避免出错，要加的RowState判断
            //if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
            //{
            //    ((LinkButton)e.Row.Cells[6].Controls[0]).Attributes.Add("onclick", "javascript:return confirm(''你确认要删除：\"" + e.Row.Cells[1].Text + "\"吗?'')");
            //}

        }
        if (e.Row.RowIndex != -1)
        {
            int id = e.Row.RowIndex + 1;
            e.Row.Cells[0].Text = id.ToString();
        }

    }
}

 11.GridView一般换行与强制换行：

效果图：

首先设置<asp:BoundField DataField="家庭住址" HeaderText="家庭住址"  ItemStyle-Width="100" />
gridview里有一列绑定的数据很长，显示的时候在一行里面显示，页面拉得很宽。
原因是连续英文段为一个整体导致的，在RowDataBound中添加上了一句e.Row.Cells[2].Style.Add("word-break", "break-all")就可以。

如果要给所有的列增加此属性：
 protected void Page_Load(object sender, EventArgs e)
    {
        //正常换行
        GridView1.Attributes.Add("style", "word-break:keep-all;word-wrap:normal");
        //下面这行是自动换行
        GridView1.Attributes.Add("style", "word-break:break-all;word-wrap:break-word");
        if (!IsPostBack)
        {
             bind();//调用数据绑定即可
        }
    }
总之：善用CSS的word-break:break-all;word-wrap:break-word属性即可，这个属性是通用的对于顽固的南换行问题都可以解决，不局限于GridView。

 12.GridView显示隐藏某一列：
本方案为月儿独创，不同于网上其他方式，我觉得用一个CheckBox更人性化，这样可以隐藏不必要的列，让用户自己选择需要出现的列，在处理多列时这是一个很好的解决方案！

效果图：
图1-开始

图2-点击显示的CheckBox后

解决方案：
public void bind()
    {
        string sqlstr = "select top 5 * from 飞狐工作室";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "飞狐工作室");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "身份证号码" };
        GridView1.DataBind();
        sqlcon.Close();
        GridView1.Columns[3].Visible = false;//一开始隐藏
        CheckBox1.Checked = false;//如果不这样后面的代码会把他True
    }

双击CheckBox1，在CheckedChanged方法里写上代码，最后代码如下：
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
         GridView1.Columns[3].Visible=! GridView1.Columns[3].Visible;
         Response.Write("GridView1的第4列现在的显示隐藏状态是："+GridView1.Columns[3].Visible.ToString());
    }

注意：CheckBox1的AutoPostBack要True！

后台全部代码如下：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState["SortOrder"] = "身份证号码";
            ViewState["OrderDire"] = "ASC";
            bind();
                   }
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        bind();
    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string sqlstr = "delete from 飞狐工作室 where 身份证号码=''" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
        sqlcon = new SqlConnection(strCon);
        sqlcom = new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        bind();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "update 飞狐工作室 set 姓名=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "'',家庭住址=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "'' where 身份证号码=''"
            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
        sqlcom=new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        GridView1.EditIndex = -1;
        bind();
    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        bind();
    }
    public void bind()
    {
        string sqlstr = "select top 5 * from 飞狐工作室";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "飞狐工作室");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "身份证号码" };
        GridView1.DataBind();
        sqlcon.Close();
        GridView1.Columns[3].Visible = false;
        CheckBox1.Checked = false;
    }
    protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
         GridView1.Columns[3].Visible=! GridView1.Columns[3].Visible;
         Response.Write("GridView1的第4列现在的显示隐藏状态是："+GridView1.Columns[3].Visible.ToString());
    }
}

前台代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>GridView显示隐藏列 清清月儿http://blog.csdn.net/21aspnet </title>
</head>
<body style="font-size=12px">
    <form id="form1" runat="server">
    <div>
                   <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="3" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing"
                        OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px"  >
                        <FooterStyle BackColor="White" ForeColor="#000066" />
                        <Columns>
                            <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />
                            <asp:BoundField DataField="姓名" HeaderText="用户姓名" />
                            <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" SortExpression="邮政编码" />
                            <asp:BoundField DataField="家庭住址" HeaderText="家庭住址"  />
                            <asp:CommandField HeaderText="选择" ShowSelectButton="True" />
                            <asp:CommandField HeaderText="编辑" ShowEditButton="True" />
                            <asp:CommandField HeaderText="删除" ShowDeleteButton="True" />
                        </Columns>
                        <RowStyle ForeColor="#000066" />
                        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
                        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
                    </asp:GridView>
        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" Font-Size="12px"
            OnCheckedChanged="CheckBox1_CheckedChanged" Text="显示隐藏家庭住址" /></div>
    </form>
</body>
</html>

 13.GridView弹出新页面/弹出制定大小位置新窗口：

效果图：

方案一：简单的方法，新窗口不固定大小
 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="3" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing"
                        OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px"  >
                        <FooterStyle BackColor="White" ForeColor="#000066" />
                        <Columns>
                            <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />
                            <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" SortExpression="邮政编码" />
                            <asp:BoundField DataField="家庭住址" HeaderText="家庭住址"  />
                            <asp:HyperLinkField HeaderText="姓名" Text="姓名" DataNavigateUrlFields="姓名" DataNavigateUrlFormatString="Default6.aspx?GoodsID={0}" Target="mainframe" NavigateUrl="~/Default6.aspx" DataTextField="姓名" >
                    </asp:HyperLinkField>
                            <asp:CommandField HeaderText="选择" ShowSelectButton="True" />
                            <asp:CommandField HeaderText="编辑" ShowEditButton="True" />
                            <asp:CommandField HeaderText="删除" ShowDeleteButton="True" />
                        </Columns>
                        <RowStyle ForeColor="#000066" />
                        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
                        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
                    </asp:GridView>
DataNavigateUrlFields是链接的字段名，DataNavigateUrlFormatString是路径。

方案二：精确控制弹出窗口大小位置
<asp:HyperLinkColumn DataNavigateUrlField="EmployeeID" DataNavigateUrlFormatString="javascript:varwin=window.open(''detail.aspx?ID={0}'',null,''width=300,height=200'');window.Close();"
       DataTextField="LastName" HeaderText="LastName"></asp:HyperLinkColumn>

使用的是结合javascript的window.open方法，关于window.open的参数网上有很多帖子，本站也有许多参考
弹出窗口大全 http://blog.csdn.net/21aspnet/archive/2004/10/25/150231.aspx   即可！

  14.GridView固定表头(不用javascript只用CSS!，很好用)：

效果图：

代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    </form>
</body>
</html>

用法：CSS设如上的样式，HeaderStyle加CssClass="Freezing，套住GridView的Div设置高度宽度 <div style="overflow-y: scroll; height: 200px;width:200px" >

15.GridView合并表头多重表头无错完美版（以合并3列3行举例）

效果图：

//这里就是解决方案
    protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
    {
        switch (e.Row.RowType)
        {
            case DataControlRowType.Header:
                //第一行表头
                TableCellCollection tcHeader = e.Row.Cells;
                tcHeader.Clear();
                tcHeader.Add(new TableHeaderCell());
                tcHeader[0].Attributes.Add("rowspan", "3"); //跨Row
                tcHeader[0].Attributes.Add("bgcolor", "white");
                tcHeader[0].Text = "";
                tcHeader.Add(new TableHeaderCell());
                //tcHeader[1].Attributes.Add("bgcolor", "Red");
                tcHeader[1].Attributes.Add("colspan", "6"); //跨Column
                tcHeader[1].Text = "全部信息</th></tr><tr>";

                //第二行表头
                tcHeader.Add(new TableHeaderCell());
                tcHeader[2].Attributes.Add("bgcolor", "DarkSeaGreen");
                tcHeader[2].Text = "身份证号码";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[3].Attributes.Add("bgcolor", "LightSteelBlue");
                tcHeader[3].Attributes.Add("colspan", "2");
                tcHeader[3].Text = "基本信息";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[4].Attributes.Add("bgcolor", "DarkSeaGreen");
                tcHeader[4].Text = "福利";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[5].Attributes.Add("bgcolor", "LightSteelBlue");
                tcHeader[5].Attributes.Add("colspan", "2");
                tcHeader[5].Text = "联系方式</th></tr><tr>";

                //第三行表头
                tcHeader.Add(new TableHeaderCell());
                tcHeader[6].Attributes.Add("bgcolor", "Khaki");
                tcHeader[6].Text = "身份证号码";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[7].Attributes.Add("bgcolor", "Khaki");
                tcHeader[7].Text = "姓名";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[8].Attributes.Add("bgcolor", "Khaki");
                tcHeader[8].Text = "出生日期";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[9].Attributes.Add("bgcolor", "Khaki");
                tcHeader[9].Text = "薪水";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[10].Attributes.Add("bgcolor", "Khaki");
                tcHeader[10].Text = "家庭住址";
                tcHeader.Add(new TableHeaderCell());
                tcHeader[11].Attributes.Add("bgcolor", "Khaki");
                tcHeader[11].Text = "邮政编码";
                break;
        }
    }
}

前台：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    </form>
</body>
</html>

16.GridView突出显示某一单元格（例如金额低于多少，分数不及格等）

效果图：

解决方案：主要是绑定后过滤
 GridView1.DataBind();
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
        {
            DataRowView mydrv = myds.Tables["飞狐工作室"].DefaultView[i];
            string score = Convert.ToString(mydrv["起薪"]);
            if (Convert.ToDouble(score) < 34297.00)//大家这里根据具体情况设置可能ToInt32等等
            {
                GridView1.Rows[i].Cells[4].BackColor = System.Drawing.Color.Red;
            }
        }
        sqlcon.Close();

全部后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Drawing;

public partial class Default7 : System.Web.UI.Page
{
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();

        }
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        bind();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "update 飞狐工作室 set 姓名=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "'',家庭住址=''"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "'' where 身份证号码=''"
            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "''";
        sqlcom = new SqlCommand(sqlstr, sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        GridView1.EditIndex = -1;
        bind();
    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        bind();
    }
    public void bind()
    {
        string sqlstr = "select top 10 * from 飞狐工作室";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "飞狐工作室");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "身份证号码" };
        GridView1.DataBind();
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
        {
            DataRowView mydrv = myds.Tables["飞狐工作室"].DefaultView[i];
            string score = Convert.ToString(mydrv["起薪"]);
            if (Convert.ToDouble(score) < 34297.00)//大家这里根据具体情况设置可能ToInt32等等

            {
                GridView1.Rows[i].Cells[4].BackColor = System.Drawing.Color.Red;
            }
        }
        sqlcon.Close();
    }
}

前台代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    </form>
</body>
</html>

 17.GridView加入自动求和求平均值小计

后台全部代码：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Drawing;

public partial class Default7 : System.Web.UI.Page
{
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();

 18.GridView数据导入Excel/Excel数据读入GridView

效果图：

解决方案：
页面增加一个按钮，单击事件添加如下方法：
protected void Button1_Click(object sender, EventArgs e)
    {
        Export("application/ms-excel", "学生成绩报表.xls");
    }

    private void Export(string FileType, string FileName)
    {
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        Response.ContentType = FileType;
        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);
        Response.Write(tw.ToString());
        Response.End();
    }
//如果没有下面方法会报错类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
    public override void VerifyRenderingInServerForm(Control control)
    {
    }
还有由于是文件操作所以要引入名称空间IO和Text

后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Text;
public partial class Default7 : System.Web.UI.Page
{
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();

    protected void Button1_Click(object sender, EventArgs e)
    {
        Export("application/ms-excel", "学生成绩报表.xls");
    }

读取Excel数据的代码：这个很简单的
private DataSet CreateDataSource()
    {
        string strCon;
        strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("excel.xls") + "; Extended Properties=Excel 8.0;";
        OleDbConnection olecon = new OleDbConnection(strCon);
        OleDbDataAdapter myda = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", strCon);
        DataSet myds = new DataSet();
        myda.Fill(myds);
        return myds;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        GridView1.DataSource = CreateDataSource();
        GridView1.DataBind();

   }

如果GridView存在模板列，其中包含子控件，例如CheckBox等，导出EXCEL后就会出现该区域的不规律。所以要对模板列单独处理（转载）

 public static void PrepareGridViewForExport(Control gv)//模式化特殊元素 flashcong
    {

        LinkButton lb = new LinkButton();
        Literal l = new Literal();
        string name = String.Empty;

        for (int i = 0; i < gv.Controls.Count; i++)
        {

            if (gv.Controls[i].GetType() == typeof(LinkButton))
            {

                l.Text = (gv.Controls[i] as LinkButton).Text;
                gv.Controls.Remove(gv.Controls[i]);
                gv.Controls.AddAt(i, l);

            }

            else if (gv.Controls[i].GetType() == typeof(DropDownList))
            {

                l.Text = (gv.Controls[i] as DropDownList).SelectedItem.Text;
                gv.Controls.Remove(gv.Controls[i]);
                gv.Controls.AddAt(i, l);

            }

            else if (gv.Controls[i].GetType() == typeof(CheckBox))
            {

               l.Text = (gv.Controls[i] as CheckBox).Checked ? "True" : "False";
               gv.Controls.Remove(gv.Controls[i]);
               gv.Controls.AddAt(i, l);

            }

            else if (gv.Controls[i].GetType() == typeof(ImageButton))
            {
              l.Text = "图片";
              gv.Controls.Remove(gv.Controls[i]);
              gv.Controls.AddAt(i, l);
            }

            if (gv.Controls[i].HasControls())
            {
                PrepareGridViewForExport(gv.Controls[i]);
            }

        }

    }

GridView隐藏列
在Asp.net 2.0中增加了一个新的数据绑定控件：GridView，其目的用来取代Asp.net1.x中的DataGrid控件。
获取GridView中的某列值的方法为
   protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        string id = GridView1.Rows[e.NewEditIndex].Cells[0].Text;
        Response.Redirect("TempletEdit.aspx?id=" + id);
    }
同理，获取GridView中的键值的方法为
   protected void GridView1_SelectChanging(object sender, GridViewEditEventArgs e)
    {
        string id = GridView1.DataKeys[e.NewSelectIndex].Value.ToString();
        Response.Redirect("TempletEdit.aspx?id=" + id);
    }
但这种方法无法获取隐藏列和模板列的值。
但有一点很不爽的是，如果把某列设置为visible=false，则不会进行数据绑定，也就是说无法直接从GridView中取到这个列内的文本。
这一功能在DataGrid时代几乎是必须的，在对列表进行批量选中操作时非常有用（比如批量删除），隐藏列通常用于存储DataGrid行对应数据记录 的关键字的值，而现在在GridView中却行不通，着实令一大批人头疼不已，网上也有了其解决方案，其中一个如下，其原理是在行创建时设置其css样式 为不可见，这样可以避免直接设置列的visible=false带来的数据不绑定问题：

void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
//让索引为0的列不可见，实际上是产生的css代码
e.Row.Cells[0].Visible = false;
//other code if neccecary
}
个人认为此方法不够优雅，Asp.net 1.x年代本人就尽量避免使用事件，宁可在数据源DataTable中做循环遍历来进行一些或烦或简的处理。一来因为vs2003对web标准支持欠佳， 而我习惯于在Html源码模式下工作，所以为DataGrid添加一个事件是极其麻烦的事情；二来因为其性能我也不大放心，毕竟每一行都要触发一次事件。 因而在GridView中仍然不喜欢事件，而且即使vs2005对web标准的支持大大改善，但添加一个事件容易，删除一个事件还是要在两个文件中进行手 动删除才能同步，比较麻烦。

就事论事，回到标题，现提供我对这个问题的解决方案，基本思想仍然是用css使得单元格不可见，而不妨碍它的数据绑定，但我的方法却不需要在cs文件中多加一行代码，其思路如下：
（1）设置一个css类：

.hidden { display:none;}

在web标准横行的现在，我想为每个aspx链接一个common.css是基本的素质，呵呵
（2）随后在GridView的列编辑对话框中，对需要进行隐藏的列进行设置，分别设置FootStyle，HeaderStyle，ItemStyle的CssClass属性为“hidden”
Ok，这样我们就实现了隐藏列的目的，同时又能保证对其进行数据绑定。

好了，看到这里，如果你有所收获，并很高兴的马上赶回去，为你的GridView添加此设置，避免了使用事件来隐藏列，并实现了批量删除的功能。那你就大错特错了，呵呵
很可惜的是，在网上看到很多人关于GridView的这个功能的讨论，很大一部分人都是为了这个功能而来的。

是的，在DataGrid中，要实现这个功能，隐藏列来存储键值是必须的，甚至是一个初学者需要摸索才能知道的技巧。然而现在GridView是用来替代 DataGrid的，微软所作的考虑更加周全。针对DataGrid无法提供行主键的问题，它提供了两个全新的属性：DataKeys和 DataKeyNames！其SDK中的描述如下：
DataKeyNames：获取或设置一个数组，该数组包含了显示在 GridView 控件中的项的主键字段的名称。
DataKeys：获取一个 DataKey 对象集合，这些对象表示 GridView 控件中的每一行的数据键值。

看到这里，也许你会有所明白，针对批量选中操作的问题，我们有了新的方案，现在来看一个简单的实现，假设主键字段是id：

//设置主键字段名称数组，可以多个字段，
//你也可以在设计器中直接设置主键字段，多个字段用逗号隔开
GridView1.DataKeyNames = new string[] { "id" };
这样，当进行数据绑定时，GridView会自动用键值填充DataKeys集合，从而在绑定或者回传后可以通过DataKeys集合来获取某一行的键值，例如假设想获取第i行的id键值，其代码如下：

//获取第i行的id键值，注意该索引即行的索引，从header到footer都算在内
string id=GridViews1.DataKeys[i]["id"].ToString();
//通过键值对数据进行处理……
由此可见，GridView提供了新的机制来绑定额外的数据到每一行。这使得可以完全放弃原来DataGrid通过隐藏列来绑定键值的做法，显然，现在的 方案要优雅的多。当然，如果你实在需要在GridView中使用隐藏列并能够进行取值，我上面的方法不防一试，虽然我很难想到有这样的需求^_^ 

/// <summary>
    /// 导出文件
    /// </summary>
    /// <param name="FileType">导出文件的类型，如:"application/ms-excel"</param>
    /// <param name="FileName">导出文件的名称,"报表.xls"</param>
    /// <param name="gv">从gridview导出</param>
    private void Export(string FileType, string FileName,GridView gv)
    {
        try
        {
            Response.Charset = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.UTF7;       // 如果设置为 GetEncoding("GB2312");导出的文件将会出现乱码！！！
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8).ToString());       //防止中文文件名乱码
            Response.ContentType = FileType;        //导出的文件类型,表格 application/ms-excel，文档 application/ms-word
            this.EnableViewState = false;
            System.IO.StringWriter tw = new System.IO.StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(tw);
            gv.RenderControl(hw);
            Response.Write(tw.ToString());
            Response.End();
        }
        catch (Exception ex)
        {
            Response.Write("<script language=javascript>alert('导出数据出错！" + ex.Message + "')</script>");
        }
    }
    //必须的，否则会报错
    public override void VerifyRenderingInServerForm(Control control)
    {
        // base.VerifyRenderingInServerForm(control);
    }

在GridView表头显示排序方向
代码如下：

//在GridView的RowCreated事件中

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)

{ 

  if (e.Row.RowType == DataControlRowType.Header) //如果是表头

    foreach (TableCell MyHeader in e.Row.Cells) //对每一单元格     

      if (MyHeader.HasControls())

        if (((LinkButton)MyHeader.Controls[0]).CommandArgument == GridView1.SortExpression)
        //是否为排序列

          if (GridView1.SortDirection == SortDirection.Ascending) //依排序方向加入方向箭头

            MyHeader.Controls.Add(new LiteralControl("↓"));

          else

            MyHeader.Controls.Add(new LiteralControl("↑"));

}

GridView控件笔记
1、无数据依然显示表头

    // 参数：所要绑定的GridView      所要绑定的数据集 
    public void BindNoRecords(GridView gridView, DataSet ds)
    {
        if(ds.Tables[0].Rows.Count == 0)
        {
            ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());
            gridView.DataSource = ds;
            gridView.DataBind();
            int columnCount = gridView.Rows[0].Cells.Count;
            gridView.Rows[0].Cells.Clear();
            gridView.Rows[0].Cells.Add(new TableCell());
            gridView.Rows[0].Cells[0].ColumnSpan = columnCount;
            gridView.Rows[0].Cells[0].Text = "没有任何记录！";
            gridView.RowStyle.HorizontalAlign = System.Web.UI.WebControls.HorizontalAlign.Center;
        }
    }

2、BoundField的格式化字符串

     DataFormatString="{0:F}" 还要加上HtmlEncode="false"才会生效。
     至于{0:F}格式请参照 String.Format格式说明

3、分页

     给GridView1添加GridView1_PageIndexChanging事件
     写入代码如：
      protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        if (GridView1.EditIndex != -1)
        {
            e.Cancel = true;
        }
        else
        {
            GridView1.PageIndex = e.NewPageIndex;
            dataBind();
        }
    }
    注：dataBind();是你绑定数据的函数，接触过GridView的程序员都应该知道怎么写吧。

    这样一个有分页功能的gridview就实现了

如何GridView动态改变行列的背景色？
Posted on 2007-07-23 15:34 赣江源 阅读(251) 评论(0)  编辑 收藏 所属分类: ASP.NET2.0 GridView 
当GridView希望依据单元格的值来动态改变行列的背景色时，可以将判断写在RowDataBound 事件中，在此事件中可以取得该单元格的值来做判断并改变显示的颜色；

例如有一个 value列，要依此列的值大小来決定列的颜色，当value大于0时背景色为蓝色，反之为红色；后台代码如下(*.aspx.cs)：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        DataRowView oRow;

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            oRow = (DataRowView)e.Row.DataItem;
            //依 value 值来决定单元格的颜色，>0,蓝色色；<0,红色；
            if (Convert.ToDouble(oRow["value"].ToString()) < 0)
            {
                e.Row.BackColor = System.Drawing.Color.Red;
            }
            else
            {
                e.Row.BackColor = System.Drawing.Color.Blue;
            }

            //或者对某一单元格着色,最后一列
            if (Convert.ToDouble(oRow["value"].ToString()) < 0)
            {
                e.Row.Cells[e.Row.Cells.Count - 1].BackColor = System.Drawing.Color.Red;
            }
            else
            {
                e.Row.Celle[e.Row.Cells.Count - 1].BackColor = System.Drawing.Color.Blue;
            }
        }

    }

如何对GridView行自动编号？
Posted on 2007-07-23 15:11 赣江源 阅读(346) 评论(0)  编辑 收藏 所属分类: ASP.NET2.0 GridView 
有时候会遇到这样的情况，就是需要对GridView表格显示的结果增加一列自动递增编号列，以标示每一行的序号。要实现这一功能，首先在 GridView 第一列加入一个 TemplateField，并在 TemplateField 的 ItemTemplate 加入一个 Label (ID=lblNo)，*.aspx 对应代码如下：

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False" 
    DataKeyNames="Flag,ID" DataSourceID="SqlDataSource1" EmptyDataText="无记录。">  
    <Columns>  
        <asp:TemplateField HeaderText="编号">  
            <ItemTemplate>  
                <asp:Label ID="lblNo" runat="server" Text="Label"></asp:Label>  
            </ItemTemplate>  
            <ItemStyle Wrap="True" />  
            <HeaderStyle Wrap="False" />  
        </asp:TemplateField>  
    </Columns>  
</asp:GridView>

然后在 GridView 的 RowDataBound 事件中，设定每一列的 lblNo 的 Text 属性值为 RowIndex + 1（因为 RowIndex 起始编号为 0 ，所以每一行的自动编号为 RowIndex + 1） 。

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        Label olabel;
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            olabel = (Label)e.Row.Cells[0].FindControl("lblNo");
            olabel.Text = Convert.ToString(e.Row.RowIndex + 1);
        }
    }
如果遇到有分页时，以上代码对每一页都是从1开始编号，所以对于有分页的情况需要修改成：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        Label olabel;
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            olabel = (Label)e.Row.Cells[0].FindControl("lblNo");
            olabel.Text = Convert.ToString(GridView1.PageIndex * GridView1.PageSize + e.Row.RowIndex + 1);
        }
    }