读取DataGrid或GridView等WebControls控件，导出Excel 读取Excel到dataTable中

最近的项目中有用到数据导出到Excel中，在网上也看了，几乎都是一些危言耸听的话，于是我把自己的代码和大家分享一下，供学习使用。

首先添加对Excel的引用NOPI.DLL

///<summary>
///导出Excel
///</summary>
///<paramname="Page">导出Excel时的页面</param>
///<paramname="parames">在Excel中增加的数据</param>
///<paramname="dg">需要导出的数据源控件</param>
///<paramname="fileName">导出Excel的文件名</param>
///<paramname="typeName">导出的文件类型</param>此处类型为：application/vnd.xls

publicstaticvoidExport(System.Web.UI.PagePage,stringparames,System.Web.UI.WebControls.DataGriddg,stringfileName,stringtypeName)
{
System.Web.HttpResponsehttpResponse=Page.Response;
httpResponse.AppendHeader("Content-Disposition","attachment;filename="HttpUtility.UrlEncode(fileName,System.Text.Encoding.UTF8));
httpResponse.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
httpResponse.ContentType=typeName;
System.IO.StringWritertw=newSystem.IO.StringWriter();
System.Web.UI.HtmlTextWriterhw=newSystem.Web.UI.HtmlTextWriter(tw);
dg.RenderControl(hw);
tw.WriteLine("<b>"parames"</b>");
stringfilePath=Page.Server.MapPath("..")fileName;
System.IO.StreamWritersw=System.IO.File.CreateText(filePath);
sw.Write(tw.ToString());
sw.Close();
DownFile(httpResponse,fileName,filePath);
httpResponse.End();
}

///<summary>
///下载问价
///</summary>
///<paramname="Response">文件流</param>
///<paramname="fileName">文件名</param>
///<paramname="fullPath">文件路径</param>
///<returns></returns>
publicstaticboolDownFile(System.Web.HttpResponseResponse,stringfileName,stringfullPath){
boolres=false;
System.IO.FileStreamfs=System.IO.File.OpenRead(fullPath);
try{
Response.ContentType="application/octet-stream";
Response.AppendHeader("Content-Disposition","attachment;filename="+
HttpUtility.UrlEncode(fileName,System.Text.Encoding.UTF8)+";charset=GB2312");

longfLen=fs.Length;
intsize=102400;//每100K同时下载数据
byte[]readData=newbyte[size];//指定缓冲区的大小
if(size>fLen)size=Convert.ToInt32(fLen);
if(size==0)thrownewException("文件生成失败！");
longfPos=0;
boolisEnd=false;
while(!isEnd){
if((fPos+size)>fLen){
size=Convert.ToInt32(fLen-fPos);
readData=newbyte[size];
isEnd=true;
}
fs.Read(readData,0,size);//读入一个压缩块
if(readData.Length>0){
Response.BinaryWrite(readData);
fPos+=size;
}
}
res=true;
}catch{
res=false;
}finally{
fs.Close();
System.IO.File.Delete(fullPath);
}
returnres;
}

//读取excel填充到dataset

publicDataSetExcelToDS(stringPath)
{
stringstrConn="Provider=Microsoft.Jet.OLEDB.4.0;"+"DataSource="+Path+";"+"ExtendedProperties='Excel8.0;HDR=YES;IMEX=1;'";
OleDbConnectionconn=newOleDbConnection(strConn);
conn.Open();
stringstrExcel="";
OleDbDataAdaptermyCommand=null;
DataSetds=null;
strExcel="select*from[Sheet1$]";
myCommand=newOleDbDataAdapter(strExcel,strConn);
ds=newDataSet();
myCommand.Fill(ds,"table1");
returnds;
}
excel2003使用的驱动是：
strConn="Provider=Microsoft.Jet.OLEDB.4.0;DataSource="+filePath+";ExtendedProperties='Excel8.0;HDR=False;IMEX=1'";

Excel2010，2007使用的驱动
strConn="Provider=Microsoft.ACE.OLEDB.12.0;DataSource="+filePath+";ExtendedProperties='Excel8.0;HDR=False;IMEX=1'";
//HDR=Yes　　表示Excel表的第一行为标题行，No则表示为数据行。
//IMEX=1;”通知驱动程序始终将“互混”数据列作为文本读取。