//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); } } }