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【Asp.Net】 .net 下载文件
作者:Dezai.CN / 发布于2013/6/12/ 589

	protected void Button1_Click1(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：
	 */
	 string strFileName = "三部闲置设备管理系统操作手册IEMS.ppt";
	 Response.ContentType = "application/x-zip-compressed";
	 //Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
	 string filename = BLL.Config.PART_EM_UPLOAD_DOC + strFileName;
	 //BLL.Config.PART_EM_UPLOAD_DOC 为路径 ("D:/EMUploadDoc/")
	 Response.AddHeader("Content-Disposition", "attachment;filename=" +Server.UrlPathEncode(strFileName));
	 //Server.UrlPathEncode()解决文件名的乱码问题.
	
	 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();
	 }
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