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 Image
This.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 Applications
http://msdn.microsoft.com/msdnmag/issues/06/09/webdownloads/default.aspx
How to: Download file from ASP.Net 2.0 Page
