ASP.NET中下载文件的几种实例代码

 //TransmitFile实现下载 
 protected void Button1_Click(object sender, EventArgs e)
 {
 /* 
 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite 
 下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。 
 代码如下： 
 */ 
 Response.ContentType = "application/x-zip-compressed";
 Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
 string filename = Server.MapPath("DownLoad/z.zip");
 Response.TransmitFile(filename);
 }

 //WriteFile实现下载 
 protected void Button2_Click(object sender, EventArgs e)
 {
 /* 
 using System.IO;
 */
 string fileName = "asd.txt";//客户端保存的文件名 
 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
 FileInfo fileInfo = new FileInfo(filePath);
 Response.Clear();
 Response.ClearContent();
 Response.ClearHeaders();
 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
 Response.AddHeader("Content-Length", fileInfo.Length.ToString());
 Response.AddHeader("Content-Transfer-Encoding", "binary");
 Response.ContentType = "application/octet-stream";
 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
 Response.WriteFile(fileInfo.FullName);
 Response.Flush();
 Response.End();
 }
 //WriteFile分块下载 
 protected void Button3_Click(object sender, EventArgs e)
 {
 string fileName = "aaa.txt";//客户端保存的文件名 
 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
 if (fileInfo.Exists == true)
 {
 const long ChunkSize = 102400;//100K 每次读取文件，只读取100K，这样可以缓解服务器的压力 
 byte[] buffer = new byte[ChunkSize];
 Response.Clear();
 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
 long dataLengthToRead = iStream.Length;//获取下载的文件总大小 
 Response.ContentType = "application/octet-stream";
 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
 while (dataLengthToRead > 0 && Response.IsClientConnected)
 {
 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小 
 Response.OutputStream.Write(buffer, 0, lengthRead);
 Response.Flush();
 dataLengthToRead = dataLengthToRead - lengthRead;
 }
 Response.Close();
 }
 }
 //流方式下载 
 protected void Button4_Click(object sender, EventArgs e)
 {
 string fileName = "aaa.txt";//客户端保存的文件名 
 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
 //以字符流的形式下载文件 
 FileStream fs = new FileStream(filePath, FileMode.Open);
 byte[] bytes = new byte[(int)fs.Length];
 fs.Read(bytes, 0, bytes.Length);
 fs.Close();
 Response.ContentType = "application/octet-stream";
 //通知浏览器下载文件而不是打开 
 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
 Response.BinaryWrite(bytes);
 Response.Flush();
 Response.End();
 }
//----------------------------------------------------------
public void DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )
{
　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires = 0;
　　WebForm.Response.Buffer = true;
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");
　　//'文件名称
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");
　　WebForm.Response.ContentType = "Application/octet-stream";
　　//'文件内容
　　WebForm.Response.Write(FileBody);//-----------
 WebForm.Response.End();
}

//上面这段代码是下载一个动态产生的文本文件，若这个文件已经存在于服务器端的实体路径，则可以通过下面的函数：
public void DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )
{
　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires = 0;
 WebForm.Response.Buffer = true;
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");
　　//文件名称
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );
　　WebForm.Response.ContentType = "Application/octet-stream";
　　//文件内容
　　WebForm.Response.Write(System.IO.File.ReadAllBytes(FilePath));//---------
　　WebForm.Response.End();
}
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
--保存文档 
string docName, docExtended; 
Stream doc = fuDoc.FileContent; 
int docLength = fuDoc.PostedFile.ContentLength; 
byte[] docData = new byte[docLength]; 
doc.Read(docData, 0, docLength); 
docExtended = fuDoc.FileName.Substring(fuDoc.FileName.IndexOf(".")); 
if (string.IsNullOrEmpty(tbDoc.Text)) 
docName = fuDoc.FileName; 
else 
docName = tbDoc.Text + docExtended; 
SafetyDocInfo data = new SafetyDocInfo(ddlSort.Text, docName, fuDoc.PostedFile.ContentType, docData); 
SafetyDoc safety = new SafetyDoc(); 
safety.Insert(data); 
tbDoc.Text = string.Empty; 
－－打开文档 
public void ViewSafetyDoc(string pDocSort, string pDocName) 
{ 
OracleParameter[] parms = GetSafetyDocParm(SQL_View_SafetyDoc); 
parms[0].Value = pDocSort; 
parms[1].Value = pDocName; 
using (OracleDataReader rdr = OracleHelper.ExecuteReader(OracleHelper.ConnectionString, CommandType.Text, SQL_View_SafetyDoc, parms)) 
{ 
while (rdr.Read()) 
{ 
HttpContext.Current.Response.Clear(); 
HttpContext.Current.Response.Buffer = true; 
HttpContext.Current.Response.Charset = "GB2312"; 
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); 
HttpContext.Current.Response.ContentType = rdr.GetString(1); 
HttpContext.Current.Response.BinaryWrite((byte[])rdr["Doc"]); 
string FileName = rdr.GetString(0); 
FileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8); 
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + FileName); 
} 
} 
}

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