突然感觉现在爱上了博客园,在这里可以看到许多网友的分享,可以一起平复受伤的心,所以,我也要充分利用博客园,将自已之前零零散散记录在记事本中的总结,记录在这里。与大家一起学习,也方便自己使用。
本节总结,几种下载文件的方法,也是从网上搜到的。
//TransmitFile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.Clear(); Response.ClearContent(); Response.ClearHeaders(); Response.ContentType = "application/octet-stream"; Response.AddHeader("Content-Disposition", "attachment;filename="+HttpUtility.UrlEncode("中国建设银行E路护航网银安全组件(大明).rar",Encoding.UTF8)); string filename = Server.MapPath("中国建设银行E路护航网银安全组件(大明).rar"); Response.TransmitFile(filename); } //流下载 protected void Button2_Click(object sender, EventArgs e) { string fileName = "下载文件.rar";//客户端保存的文件名 string filePath = Server.MapPath(fileName);//转化为当前项目下的路径 FileInfo fileInfo = new FileInfo(filePath); Response.Clear(); Response.ClearContent(); Response.ClearHeaders(); Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8)); 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(); } /// <summary> /// 分块下载文件 /// </summary> /// <param name="strPath">文件的相对路径</param> /// <param name="fileName">文件名称</param> protected void fileDown(string strPath, string fileName) { string filePath = Server.MapPath(strPath);//转化为当前项目下的路径 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath); if (fileInfo.Exists == true) { //文件存在 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, Encoding.UTF8)); 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.Flush(); Response.End(); Response.Close(); } else { Response.Write("<script>window.opener=null;window.open('','_top');alert('文件不存在!');window.top.close();</script>"); } }
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(); }