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System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
return ms.ToArray();
HttpResponse Response = context.Response;
Response.ClearContent();
Response.ContentType = "image/jpeg";
System.Drawing.Image img;//填充img
img.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
img.Dispose();
如果你想用jpg,直接上传的图片存下来啊,然后用jpg