wcf http 返回图片

[ServiceContract]
public interface IImageServer
{
[OperationContract, WebGet]
Stream GetImage(int width, int height);
}

public class Service : IImageServer
{
public Stream GetImage(int width, int height)
{
Bitmap bitmap = new Bitmap(width, height);
for (int i = 0; i < bitmap.Width; i++)
{
for (int j = 0; j < bitmap.Height; j++)
{
bitmap.SetPixel(i, j, (Math.Abs(i - j) < 2) ? Color.Blue : Color.Yellow);
}
}
MemoryStream ms = new MemoryStream();
bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
ms.Position = 0;
WebOperationContext.Current.OutgoingResponse.ContentType = "image/jpeg";//可以换成其它格式的图片
return ms;
}
}