使用ExcelHelper 封装类，将DataSet 输出成Excel文件的多个Sheet 页。
使用代码如下：
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
btn.Click += new EventHandler(btn_Click);
Button1.Click += new EventHandler(Button1_Click);
}
void Button1_Click(object sender, EventArgs e)
{
var ds = new DataSet();
var dt = new DataTable("TableName For Sheet1");
dt.Columns.Add("col1");
dt.Columns.Add("col2");
dt.Rows.Add("Value1", "Value2");
var dt2 = new DataTable("TableName For Sheet2");
dt2.Columns.Add("col1");
dt2.Columns.Add("col2");
dt2.Rows.Add("Value1", "Value2");
ds.Tables.Add(dt);
ds.Tables.Add(dt2);
ExcelHelper.ToExcel(ds, "test.xls", Page.Response);
}
void btn_Click(object sender, EventArgs e)
{
var ds = new DataSet();
DataTable dt = new DataTable();
dt.Columns.Add("col");
ds.Tables.Add(dt);
ExcelHelper.ToExcel(ds, "test.xls", Page.Response);
}
}
ExcelHelper.cs 封装类，源代码如下：
//ExcelHelper.cs
public class ExcelHelper
{
//Row limits older Excel version per sheet
const int rowLimit = 65000;
private static string getWorkbookTemplate()
{
var sb = new StringBuilder();
sb.Append("<xml version>\r\n<Workbook
xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n");
sb.Append(" xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n
xmlns:x=\"urn:schemas- microsoft-com:office:excel\"\r\n
xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\">\r\n");
sb.Append(" <Styles>\r\n
<Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n
<Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>");
sb.Append("\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>\r\n
<Protection/>\r\n </Style>\r\n
<Style ss:ID=\"BoldColumn\">\r\n <Font ");
sb.Append("x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n
<Style ss:ID=\"s62\">\r\n <NumberFormat");
sb.Append(" ss:Format=\"@\"/>\r\n </Style>\r\n
<Style ss:ID=\"Decimal\">\r\n
<NumberFormat ss:Format=\"0.0000\"/>\r\n </Style>\r\n ");
sb.Append("<Style ss:ID=\"Integer\">\r\n
<NumberFormat ss:Format=\"0\"/>\r\n </Style>\r\n
<Style ss:ID=\"DateLiteral\">\r\n <NumberFormat ");
sb.Append("ss:Format=\"mm/dd/yyyy;@\"/>\r\n </Style>\r\n
<Style ss:ID=\"s28\">\r\n");
sb.Append("<Alignment ss:Horizontal=\"Left\" ss:Vertical=\"Top\"
ss:ReadingOrder=\"LeftToRight\" ss:WrapText=\"1\"/>\r\n");
sb.Append("<Font x:CharSet=\"1\" ss:Size=\"9\"
ss:Color=\"#808080\" ss:Underline=\"Single\"/>\r\n");
sb.Append("<Interior ss:Color=\"#FFFFFF\" ss:Pattern=\"Solid\"/>
</Style>\r\n</Styles>\r\n {0}</Workbook>");
return sb.ToString();
}
private static string replaceXmlChar(string input)
{
input = input.Replace("&", "&");
input = input.Replace("<", "<");
input = input.Replace(">", ">");
input = input.Replace("\"", """);
input = input.Replace("'", "'");
return input;
}
private static string getWorksheets(DataSet source)
{
var sw = new StringWriter();
if (source == null || source.Tables.Count == 0)
{
sw.Write("<Worksheet ss:Name=\"Sheet1\"><Table><Row>
<Cell ss:StyleID=\"s62\"><Data ss:Type=\"String\"></Data>
</Cell></Row></Table></Worksheet>");
return sw.ToString();
}
foreach (DataTable dt in source.Tables)
{
if (dt.Rows.Count == 0)
sw.Write("<Worksheet ss:Name=\"" + replaceXmlChar(dt.TableName) +
"\"><Table><Row><Cell ss:StyleID=\"s62\">
<Data ss:Type=\"String\"></Data></Cell></Row>
</Table></Worksheet>");
else
{
//write each row data
var sheetCount = 0;
for (int i = 0; i < dt.Rows.Count; i++)
{
if ((i % rowLimit) == 0)
{
//add close tags for previous sheet of the same data table
if ((i / rowLimit) > sheetCount)
{
sw.Write("</Table></Worksheet>");
sheetCount = (i / rowLimit);
}
sw.Write("<Worksheet ss:Name=\"" +
replaceXmlChar(dt.TableName) +
(((i / rowLimit) == 0) ? "" :
Convert.ToString(i / rowLimit)) + "\"><Table>");
//write column name row
sw.Write("<Row>");
foreach (DataColumn dc in dt.Columns)
sw.Write(
string.Format(
"<Cell ss:StyleID=\"BoldColumn\">
<Data ss:Type=\"String\">{0}</Data></Cell>",
replaceXmlChar(dc.ColumnName)));
sw.Write("</Row>\r\n");
}
sw.Write("<Row>\r\n");
foreach (DataColumn dc in dt.Columns)
sw.Write(
string.Format(
"<Cell ss:StyleID=\"s62\"><Data ss:Type=\"String\">
{0}</Data></Cell>",
replaceXmlChar
(dt.Rows[i][dc.ColumnName].ToString())));
sw.Write("</Row>\r\n");
}
sw.Write("</Table></Worksheet>");
}
}
return sw.ToString();
}
public static string GetExcelXml(DataTable dtInput, string filename)
{
var excelTemplate = getWorkbookTemplate();
var ds = new DataSet();
ds.Tables.Add(dtInput.Copy());
var worksheets = getWorksheets(ds);
var excelXml = string.Format(excelTemplate, worksheets);
return excelXml;
}
public static string GetExcelXml(DataSet dsInput, string filename)
{
var excelTemplate = getWorkbookTemplate();
var worksheets = getWorksheets(dsInput);
var excelXml = string.Format(excelTemplate, worksheets);
return excelXml;
}
public static void ToExcel
(DataSet dsInput, string filename, HttpResponse response)
{
var excelXml = GetExcelXml(dsInput, filename);
response.Clear();
response.AppendHeader("Content-Type", "application/vnd.ms-excel");
response.AppendHeader
("Content-disposition", "attachment; filename=" + filename);
response.Write(excelXml);
response.Flush();
response.End();
}
public static void ToExcel
(DataTable dtInput, string filename, HttpResponse response)
{
var ds = new DataSet();
ds.Tables.Add(dtInput.Copy());
ToExcel(ds, filename, response);
}
}
来源：http://www.codeproject.com/KB/office/ExportDataSetToExcel.aspx
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