ASP.NET导出Excel数据：代码详解

1、由dataset生成 

public void CreateExcel(DataSet ds,string typeid,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=""; 
   int i=0; 
 
   //定义表对象与行对像，同时用DataSet对其值进行初始化 
   DataTable dt=ds.Tables[0]; 
   DataRow[] myRow=dt.Select("");  
   // typeid=="1"时导出为EXCEL格式文件；typeid=="2"时导出为XML格式文件 
   if(typeid=="1") 
   { 
    //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     colHeaders+=dt.Columns[i].Caption.ToString()+"\t"; 
    colHeaders +=dt.Columns[i].Caption.ToString() +"\n";    
    //向HTTP输出流中写入取得的数据信息 
    resp.Write(colHeaders);  
    //逐行处理数据   
    foreach(DataRow row in myRow) 
    { 
     //在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n 
     for(i=0;i      ls_item +=row[i].ToString() + "\t";      
     ls_item += row[i].ToString() +"\n"; 
     //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据     
     resp.Write(ls_item); 

     ls_item=""; 
    } 
   } 
   else 
   { 
    if(typeid=="2") 
    {  
     //从DataSet中直接导出XML数据并且写到HTTP输出流中 
     resp.Write(ds.GetXml()); 
    }     
   } 
   //写缓冲区中的数据到HTTP头文件中 
   resp.End(); 
 
 
  } 


2、由datagrid生成 

public void ToExcel(System.Web.UI.Control ctl)   
  { 
   HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=Excel.xls"); 
   HttpContext.Current.Response.Charset ="UTF-8";     
   HttpContext.Current.Response.ContentEncoding =System.Text.Encoding.Default; 
   HttpContext.Current.Response.ContentType ="application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword 
   ctl.Page.EnableViewState =false;    
   System.IO.StringWriter  tw = new System.IO.StringWriter() ; 
   System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter (tw); 
   ctl.RenderControl(hw);