怎么将 DataTable 直接生成 Excel

/// <summary>/// 生成Excel文件/// </summary>/// <param name="ds">数据集</param>/// <param name="fileName">生成文件名</param>private void CreateExcel(DataTable dt, string fileName){    HttpResponse resp;    resp = Page.Response;    resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");    resp.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);    string colHeaders = "", ls_item = "";    ////定义表对象与行对象，同时用DataSet对其值进行初始化    //DataTable dt = ds.Tables[0];    DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的    int i = 0;    int cl = dt.Columns.Count;    //取得数据表各列标题，各标题之间以t分割，最后一个列标题后加回车符    for (i = 0; i < cl; i++)    {        if (i == (cl - 1))//最后一列，加n        {            colHeaders += dt.Columns[i].Caption.ToString() + "\n";        }        else        {            colHeaders += dt.Columns[i].Caption.ToString() + "\t";        }    }    resp.Write(colHeaders);    //向HTTP输出流中写入取得的数据信息    //逐行处理数据     foreach (DataRow row in myRow)    {        //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据           for (i = 0; i < cl; i++)        {            if (i == (cl - 1))//最后一列，加n            {                ls_item += row[i].ToString() + "\n";            }            else            {                ls_item += row[i].ToString() + "\t";            }        }        resp.Write(ls_item);        ls_item = "";    }    resp.End(); }
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public static bool ExportToExcel(DataTable table, string excelName, int[] columnIndexs, string[] columnHeads)
   {
        Excel.ApplicationClass oExcel = new Excel.ApplicationClass();
       Excel.Workbook obook = null;
       Excel.Worksheet oSheet = null;
       Excel.Range range = null;
       #endregion
       try
       {
           obook = oExcel.Workbooks.Add("");
           oSheet = (Excel.Worksheet)obook.Worksheets[1];
           int rCount, cCount;
           rCount = table.Rows.Count;
           cCount = table.Columns.Count;
           object obj = System.Reflection.Missing.Value;

           if (cCount < columnIndexs.Length || cCount < columnHeads.Length)
           {
               throw new ArgumentOutOfRangeException("columnIndexs 与 columnHeads 长度必须一致。");
           }
           for (int i = 1; i <= columnIndexs.Length; i++)
           {
              
               range = (Excel.Range)oSheet.Columns.get_Item(i, obj);
               range.NumberFormatLocal = "@";
           }
           for (int c = 0; c < columnIndexs.Length; c++)
           {
               oSheet.Cells[1, c + 1] = columnHeads[c];
               for (int r = 1; r <= rCount; r++)
               {
                   oSheet.Cells[r + 1, c + 1] = table.Rows[r - 1][columnIndexs[c]].ToString();
               }
           }
           obook.SaveCopyAs(excelName);
          obook.Close(false, System.Reflection.Missing.Value, System.Reflection.Missing.Value);
           return true;
       }
       catch (Exception ex)
       {
           throw ex;
       }
       finally
       {
            ystem.Runtime.InteropServices.Marshal.ReleaseComObject(range);
           System.Runtime.InteropServices.Marshal.ReleaseComObject(oSheet);
           System.Runtime.InteropServices.Marshal.ReleaseComObject(obook);
          
           oExcel.Quit();
           System.Runtime.InteropServices.Marshal.ReleaseComObject(oExcel);
   
           GC.Collect();
       }
   }
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http://www.cnblogs.com/ghostljj/archive/2008/09/05/629336
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参考
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C# code
DataTable dt=ds.Tables["table1"];             StringWriter sw=new StringWriter();             sw.WriteLine("自动编号\t姓名\tSid");              foreach(DataRow dr in dt.Rows)             {                 sw.WriteLine(dr["pID"]+"\t"+dr["pName"]+"\t"+dr["pSexID"]);             }              sw.Close();             Response.AddHeader("Content-Disposition", "attachment; filename=test.xls");             Response.ContentType = "application/ms-excel";             Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");             Response.Write(sw);             Response.End();