Question

我正在使用JSON格式运行WCF Web服务，如下所示。我的问题是响应格式是json或XML，但对于GetImage，我想将图像作为mime-type image-png返回。知道如何在WCF中执行此操作吗？提前谢谢。

[ServiceContract]
public interface IEditor
{
    [OperationContract]
    [WebInvoke(Method = "GET", UriTemplate = "/GetImage", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
    byte[] GetImage();

[OperationContract]
[WebInvoke(Method = "GET", UriTemplate = "/GetBounds", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
void GetBounds(out Rectangle bounds, out Point[] viewport);

Answer 1

使用WebOperationContext.Current
返回Stream

你的方法应该是这样的

[OperationContract]
[WebInvoke(Method = "GET", UriTemplate = "/GetImage", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
public Stream GetImage()
{
    var m = new MemoryStream();
    //Fill m

    // very important!!! otherwise the client will receive content-length:0
    m.Position = 0;

    WebOperationContext.Current.OutgoingResponse.ContentType = "image/png";
    WebOperationContext.Current.OutgoingResponse.ContentLength = m.Length;
    return m;
}

C＃WCF JSON WebService返回mime-type image / png

1 个答案: