一、//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); } 二、//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(); } 三、 //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(); } } 四、//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.Rea}dAllBytes(FilePath));//--------- WebForm.Response.End(); ｝
/// <summary> /// c#,.net 下载文件 /// </summary> /// <param name="URL">下载文件地址</param> /// /// <param name="Filename">下载后的存放地址</param> /// <param name="Prog">用于显示的进度条</param> /// public void DownloadFile(string URL, string filename, System.Windows.Forms.ProgressBar prog, System.Windows.Forms.Label label1) { if (URL == "") { MessageBox.Show("URL为空","消息提示",MessageBoxButtons.OK,MessageBoxIcon.Information); return; } float percent = 0; try { System.Net.HttpWebRequest Myrq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL); System.Net.HttpWebResponse myrp = (System.Net.HttpWebResponse)Myrq.GetResponse(); long totalBytes = myrp.ContentLength; if (prog != null) { prog.Maximum = (int)totalBytes; } System.IO.Stream st = myrp.GetResponseStream(); System.IO.Stream so = new System.IO.FileStream(filename, System.IO.FileMode.Create); long totalDownloadedByte = 0; byte[] by = new byte[1024]; int osize = st.Read(by, 0, (int)by.Length); while (osize > 0) { totalDownloadedByte = osize + totalDownloadedByte; System.Windows.Forms.Application.DoEvents(); so.Write(by, 0, osize); if (prog != null) { prog.Value = (int)totalDownloadedByte; } osize = st.Read(by, 0, (int)by.Length); percent = (float)totalDownloadedByte / (float)totalBytes * 100; label1.Text = "当前下载进度" + percent.ToString("00.00") + "%"; System.Windows.Forms.Application.DoEvents(); //必须加注这句代码，否则label1将因为循环执行太快而来不及显示信息 if (percent == 100) { MessageBox.Show("下载完成", "消息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } } so.Close(); st.Close(); } catch (System.Exception ee) { //throw; MessageBox.Show(ee.Message, "消息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } }