将 bitmap.Save(page.Response.OutputStream, ImageFormat.Png);
改为:
MemoryStream MemStream = new MemoryStream();
bitmap.Save(MemStream, ImageFormat.Png);
MemStream.WriteTo(page.Response.OutputStream);
将 bitmap.Save(page.Response.OutputStream, ImageFormat.Png);
改为:
MemoryStream MemStream = new MemoryStream();
bitmap.Save(MemStream, ImageFormat.Png);
MemStream.WriteTo(page.Response.OutputStream);