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    最近写的一个程序中需要用到DataGridView的多列排序，参考了一下MSDN上的东西，似乎只能用于两列而且不是很灵活（也许是我没有真正弄明白），由于时间的关系，没有仔细去研究。想到了下面这个方法：

代码

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Drawing;
  4 using System.Windows.Forms;
  5 
  6 namespace DataGridViewColumnSort
  7 {
  8     /// <summary>
  9     /// Description of MainForm.
 10     /// </summary>
 11     public partial class MainForm : Form
 12     {
 13         public MainForm()
 14         {
 15             //
 16             // The InitializeComponent() call is required for Windows Forms designer support.
 17             //
 18             InitializeComponent();
 19             
 20             //
 21             // TODO: Add constructor code after the InitializeComponent() call.
 22             //
 23             this.BuildSortInfoTable();
 24             this.FillDataGridView();
 25             this.SetColumnSortMode();
 26         }
 27         
 28         private System.Data.DataTable dtSort;
 29         private System.Data.DataView dv;
 30         
 31         private void BuildSortInfoTable()
 32         {
 33             dtSort=new System.Data.DataTable();
 34             dtSort.Columns.Add("Field",System.Type.GetType("System.String"));
 35             dtSort.Columns.Add("Sort",System.Type.GetType("System.String"));
 36             dtSort.Columns.Add("ColumnText",System.Type.GetType("System.String"));
 37             dtSort.Columns.Add("ColumnIndex",System.Type.GetType("System.String"));
 38         }
 39         
 40         private void FillDataGridView()
 41         {
 42             System.Data.SqlClient.SqlConnection cn=new System.Data.SqlClient.SqlConnection();
 43             cn.ConnectionString="Server=.;User ID=sa;Password=;Database=Northwind";
 44             string strSQL="select LastName,FirstName,Title,BirthDate,Address,City from Employees";
 45             System.Data.SqlClient.SqlDataAdapter ad=new System.Data.SqlClient.SqlDataAdapter(strSQL,cn);
 46             System.Data.DataSet ds=new System.Data.DataSet();
 47             ad.Fill(ds);
 48             dv=ds.Tables[0].DefaultView;
 49             this.dataGridView1.DataSource=dv;
 50         }
 51         
 52         private void SetColumnSortMode()
 53         {
 54             for(int i=0;i<this.dataGridView1.Columns.Count;i++)
 55             {
 56                 this.dataGridView1.Columns[i].SortMode= DataGridViewColumnSortMode.Programmatic;
 57             }
 58         }
 59         
 60         void DataGridView1ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
 61         {
 62             for(int i=0;i<this.dataGridView1.Columns.Count;i++)
 63             {
 64                 this.dataGridView1.Columns[i].ToolTipText=null;
 65             }
 66             string strField=this.dataGridView1.Columns[e.ColumnIndex].DataPropertyName;
 67             if(dtSort.Rows.Count==0)
 68             {
 69                 System.Data.DataRow dr=dtSort.NewRow();
 70                 dr[0]=strField;
 71                 dr[1]="ASC";
 72                 dr[2]=this.dataGridView1.Columns[e.ColumnIndex].HeaderText;
 73                 dr[3]=e.ColumnIndex;
 74                 dtSort.Rows.Add(dr);
 75             }
 76             else
 77             {
 78                 if(dtSort.Select("Field='"+strField+"'").Length==0)
 79                 {
 80                     System.Data.DataRow dr=dtSort.NewRow();
 81                     dr[0]=strField;
 82                     dr[1]="ASC";
 83                     dr[2]=this.dataGridView1.Columns[e.ColumnIndex].HeaderText;
 84                     dr[3]=e.ColumnIndex;
 85                     dtSort.Rows.Add(dr);
 86                 }
 87                 else
 88                 {
 89                     for(int i=0;i<dtSort.Rows.Count;i++)
 90                     {
 91                         if(dtSort.Rows[i][0].ToString()==strField)
 92                         {
 93                             if(dtSort.Rows[i][1].ToString()=="ASC")
 94                             {
 95                                 dtSort.Rows[i][1]="DESC";
 96                                 break;
 97                             }
 98                             else
 99                             {
100                                 dtSort.Rows.RemoveAt(i);
101                             }
102                         }
103                     }
104                 }
105             }
106             dv.Sort=null;
107             for(int i=0;i<dtSort.Rows.Count;i++)
108             {
109                 if(i==0)
110                     dv.Sort=dtSort.Rows[i][0].ToString()+" "+dtSort.Rows[i][1].ToString();
111                 else
112                     dv.Sort+=","+dtSort.Rows[i][0].ToString()+" "+dtSort.Rows[i][1].ToString();
113                 int iIndex=Convert.ToInt32(dtSort.Rows[i][3]);
114                 if(dtSort.Rows[i][1].ToString()=="ASC")
115                     this.dataGridView1.Columns[iIndex].ToolTipText=dtSort.Rows[i][2].ToString()+" 升序 "+(i+1).ToString();
116                 else
117                     this.dataGridView1.Columns[iIndex].ToolTipText=dtSort.Rows[i][2].ToString()+" 降序 "+(i+1).ToString();
118             }
119         }
120     }
121 }
122 

     大致的思路就是利用DataGridView绑定数据源DataView对象的Sort方法来实现，还是通过点击DataGridView的列头来实现。为了显示列排序的方式和顺序使用了ToolTip。

    方法还有缺陷有待改进，先贴出来和大家分享。