WCF Web API 预览 6：无“MediaTypeFormatter”可用

发布于 2024-12-19 14:19:17 字数 600 浏览 2 评论 0原文

我正在考虑在 WCF Web API Preview 6 中使用 HttpClient 来使用第三方服务。该第三方服务接受并返回 XML 格式的数据。它们的 HTTP 响应的 Content-Type 标头设置为 text/plain。看来将响应 Content-Type 设置为 text/plain 会导致问题。我按如下方式向服务发出请求：

Task<HttpResponseMessage> result = client.PostAsync(apiEndpoint, new ObjectContent(typeof (LeaveAccrualRequest), request));

使用 Fiddler，我可以看到请求发送到服务，并返回适当的预期响应。但是，当我尝试访问响应时，最终出现以下 InvalidOperationException：

没有“MediaTypeFormatter”可用于读取媒体类型为“text/plain”的“LeaveAccrualResponse”类型的对象。

是有没有办法告诉 HttpClient，即使 HTTP 响应说内容类型是 text/plain，它也应该将其处理为 application/xml？

原文

I'm looking at using HttpClient in WCF Web API Preview 6 to consume a third party service. This third party service accepts and returns XML formatted data. Their HTTP responses have the Content-Type header set to text/plain. It appears that having the response Content-Type set to text/plain is causing problems. I'm making the request to the service as follows:

Task<HttpResponseMessage> result = client.PostAsync(apiEndpoint, new ObjectContent(typeof (LeaveAccrualRequest), request));

Using Fiddler, I can see the request go to the service and an appropriate, expected response come back. However when I try to access the response, I end up with the following InvalidOperationException:

No 'MediaTypeFormatter' is available to read an object of type 'LeaveAccrualResponse' with the media type 'text/plain'.

Is there a way to tell HttpClient that even though the HTTP response says the content type is text/plain, it should handle it as application/xml?

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半世晨晓 2024-12-26 14:19:17

您可以从 XmlMediaTypeFormatter 派生并添加“text/plain”标头：

public class TextPlainXmlMediaTypeFormatter : XmlMediaTypeFormatter {
    public TextPlainXmlMediaTypeFormatter() {
        SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/plain"));
    }
}

根据您的要求，在添加“text/plain”之前删除所有其他支持的媒体类型可能是有意义的：

SupportedMediaTypes.Clear();

[更新]

访问您的请求内容并使用 ReadAsAsync; 接受 IEnumerable的方法覆盖。

You could derive from XmlMediaTypeFormatter and add your "text/plain" header:

public class TextPlainXmlMediaTypeFormatter : XmlMediaTypeFormatter {
    public TextPlainXmlMediaTypeFormatter() {
        SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/plain"));
    }
}

Depending on your requirements it could make sense to remove all other supported media types before adding "text/plain: