ASP.NET下载文件出现提示框或者直接显示在浏览器中

ASP.NET下载文件出现提示框或者直接显示在浏览器中

技术交流 2008-06-20 11:44 阅读42 评论0
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1：出现文件下载提示框

string strFile="F://a.doc";//路径根据实际情况而定
if(!System.IO.File.Exists(strFile))
{
Response.Write("<script language='javascript'>alert('对不起，文件不存在！');</script>");
return;
}
Response.Clear();
Response.ClearHeaders();
Response.Charset = "GB2312";
Response.ContentEncoding =System.Text.Encoding.UTF8;
Response.ContentType = "application/octet-stream";
FileInfo fi=new FileInfo(strFile);
Response.AddHeader("Content-Disposition","attachment; filename=" + HttpUtility.UrlEncode(fi.Name)) ;
Response.AddHeader("Content-Length",fi.Length.ToString());
byte[] tmpbyte=new byte[1024*8];
FileStream fs=fi.OpenRead();
int count;
while((count=fs.Read(tmpbyte,0,tmpbyte.Length))>0)
{
Response.BinaryWrite(tmpbyte);
Response.Flush();
}
fs.Close();
Response.End();

2：直接在浏览器中打开

string strFile="F://a.doc";//路径根据实际情况而定
Response.Clear();
Response.ClearHeaders();
Response.Charset = "GB2312";
Response.ContentEncoding =System.Text.Encoding.UTF8;
Response.ContentType = "application/msword";
Response.WriteFile(strFile);

3：封装成类的文件下载方法的写法

///
/// 在页面中显示下载对话框并下载指定的文件，webPage为页面对象引用（一般赋值Page)，filePath为下载文件虚拟路径，fileName为对话框中显示的文件名
///
public static void DownloadFile(Page webPage, string filePath, string fileName)
{
HttpResponse Response = webPage.Response;
FileInfo aFile = new FileInfo(webPage.Server.MapPath(filePath));
Response.Clear();
Response.ClearHeaders();
Response.BufferOutput = false;
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.AddHeader("Content-Length", aFile.Length.ToString());
Response.WriteFile(filePath);
Response.Flush();
Response.End();
}