Web API:HttpResponseMessage 中的内容 [英] Web API: Content in HttpResponseMessage

问题描述

在我的一个 Get 请求中，我想返回一个包含一些内容的 HttpResponseMessage.目前我的工作方式如下:

var header = new MediaTypeHeaderValue("text/xml");Request.CreateResponse(HttpStatusCode.OK, myObject, header);

然而，由于我使用的是静态请求，这变得非常难以测试.根据我的阅读，我应该能够做到以下几点:

return new HttpResponseMessage(objectInstance);

但是，似乎无法做到这一点.是不是因为我使用的是旧版本的 WebApi/.NET?

<小时>

顺便说一句，我发现您可能会创建如下响应:

var response = new HttpResponseMessage();response.Content = new ObjectContent(typeof(T), objectInstance, mediaTypeFormatter);

令我困惑的是为什么我必须在这里添加一个 mediaTypeFormatter.我在 global.asax 级别添加了媒体类型格式化程序.

谢谢！

解决方案

HttpResponseMessage 在 Beta 版之后被移除.现在，我们有一个类型化的 ObjectContent

而不是类型化的 HttpResponseMessage

如果您使用其默认的无参数构造函数手动创建 HttpResponseMessage，则没有可用于执行内容协商的请求上下文 - 这就是您需要指定格式化程序或手动执行内容协商的原因.>

我知道你不想这样做 - 所以改用这个:

HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, objInstance);

这将创建依赖于针对请求执行的内容协商的响应消息.

最后，您可以在此处阅读有关内容协商的更多信息 在这个链接上

In one of my Get request, I want to return an HttpResponseMessage with some content. Currently I have it working as follows:

var header = new MediaTypeHeaderValue("text/xml");
Request.CreateResponse(HttpStatusCode.OK, myObject, header);

However, since I am using the static Request, this becomes really difficult to test. From what I have read, I should be able to do the following:

return new HttpResponseMessage<T>(objectInstance);

However, seem to not be able to do this. Is it because I am using a older version of WebApi / .NET?

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On a side note, I found that you could potentially create a response as follows:

var response = new HttpResponseMessage();
response.Content = new ObjectContent(typeof(T), objectInstance, mediaTypeFormatter);

What puzzled me is why do I have to add a mediaTypeFormatter here. I have added the media type formatter at the global.asax level.

Thanks!

解决方案

HttpResponseMessage<T> was removed after Beta. Right now, instead of a typed HttpResponseMessage we have a typed ObjectContent

If you manually create HttpResponseMessage using its default parameterless constructor, there is no request context available to perform content negotiation - that's why you need to specify the formatter, or perform content negotiation by hand.

I understand you don't want to do that - so use this instead:

HttpResponseMessage response = Request.CreateResponse<MyObject>(HttpStatusCode.OK, objInstance);

That would create the response message relying on the content negotiation performed against the request.

Finally, you can read more about content negotiation here On this link

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