test

using System.IO void Download() { System.IO.FileStream r = new System.IO.FileStream(FileName, System.IO.FileMode.Open); //文件下载实例化 //设置基本信息 Response.Buffer= false; Response.AddHeader("Connection", "Keep-Alive"); Response.ContentType = "application/octet-stream"; Response.AddHeader("Content-Disposition", "attachment;filename=" + System.IO.Path.GetFileName(FileName)); // 此处文件名如果是中文在浏览器默认是筹码,应该加HttpUtility.UrlEncode(filename) Response.AddHeader("Content-Length", r.Length.ToString()); while (true) //如果文件大于缓冲区，通过while循环多次加载文件 { //开辟缓冲区空间 byte[] buffer = new byte[1024]; //读取文件的数据 int leng = r.Read(buffer, 0, 1024); if(leng == 0) //到文件尾，结束 break; if (leng == 1024) //读出的文件数据长度等于缓冲区长度，直接将缓冲区数据写入 Response.BinaryWrite(buffer); //向客户端发送数据流 else { //读出文件数据比缓冲区小，重新定义缓冲区大小，只用于读取文件的最后一个数据块 byte[] b = new byte[leng]; for (int i = 0; i < leng; i++) b[i] = buffer[i]; Response.BinaryWrite(b); } } r.Close();//关闭下载文件 Response.End();//结束文件下载 }