ASP.NET中通过对话框方式下载文件

1;通过探出对话框提示文件下载或打开2;通过自定义Header让特定的应用程序打开文件使用的方法：Response.TransmitFile()例程：以下是引用片段：Response.ContentType;=;“image/jpeg;;Response.AppendHeader(“Content-Disposition,attachment;;filename=SailBig.jpg);;Response.TransmitFile(;Server.MapPath(“~/images/sailbig.jpg););;流传送所使用的方法：Response.BinaryWrite()和Response.OutputStream();例程：以下是引用片段：Bitmap;bmp;=;wwWebUtils.CornerImage(backcolor,;color,;c,;Radius,;Height,;Width);;Response.ContentType;=;“image/jpeg;;Response.AppendHeader(“Content-Disposition,attenment;;filename=LeftCorner.jpg);;bmp.Save(Response.OutputStream,;ImageFormat.Jpeg);;关于Content;Type(MIME;Type)的参考URL：http://www.w3.org/TR/html4/types.html;(概述)http://www.iana.org/assignments/media-types/;(详细列表)常见问题解决方案：;1、当从资源文件或者数据库BLOB字段载入图像出现错误错误内容：A;generic;error;occurred;in;GDI+代码：以下是引用片段：Bitmap;bmp;=;this.GetGlobalResourceObject(“Resource,_BitMap);as;Bitmap;;Response.ContentType=image/jpeg;;bmp.Save(Response.OutputStream,;ImageFormat.Jpeg);;Response.End();;解决方法，再创建一个实例接收从资源文件或者数据库BLOB字段读入的图像内容。解决方案代码：以下是引用片段：Bitmap;bmp;=;this.GetGlobalResourceObject(“Resource,;_BitMap);as;Bitmap;Bitmap;temp;=;new;Bitmap(bmp);Response.ContentType;=;“image/jpeg;Temp.Save(Response.OutputStream,;ImageFormat.Jpeg);bmp.Dispose();temp.Dispose();Response.End();;2、无法直接把PNG图像存入到输出流;原因：PNG是特殊的图片格式解决方案代码：以下是引用片段：Bitmap;bmp;=;this.GetGlobalResourceObject(;“Resource,;“_BitMap);as;Bitmap;Bitmap;temp;=;new;Bitmap(bmp);MemoryStream;ms;=;new;MemoryStream();Response.ContentType=image/png;temp.Save(ms,;System.Drawing.Imaging,;ImageFormat.Png);Ms.WriteTo(Response.OutputStream);bmp.Dispose();temp.Dispose();Response.End();;3、解决缓存问题以下是引用片段：Response.ContentType=image/png;Response.Buffer;=;false;Response.Clear();MemoryStream;stream1;=;new;MemoryStream();//;DrawPie;method;return;an;ImageThis.DrawPie(table1).Save(stream1,ImageFormat.Png);Response.BinaryWrite(stream1.ToArray());Base.OnPreInit(e);;可以参考的资料：Build;Smarter;ASP.NET;File;Downloading;Into;Your;Web;Applicationshttp://msdn.microsoft.com/msdnmag/issues/06/09/webdownloads/default.aspxHow;to:;Download;file;from;ASP.Net;2.0;Pagehttp://geekswithblogs.net/rachit/archive/2007/04/20/How-to-ASP.Net-File-Download.aspx