是否可以仅将一个类的MediaTypeFormatter更改为JSON? [英] Is it possible to change the MediaTypeFormatter to JSON for only one class?

问题描述

我有一个Web API，其中全局配置配置为使用:XmlMediaTypeFormatter

I have a web api, where the global configuration is configured to use: XmlMediaTypeFormatter

我的问题是我不会使用新的控制器来扩展此Web api，而是使用JsonMediaTypeFormatter.

My problem is I wont to extend this web api with a new controller, that uses the JsonMediaTypeFormatter instead.

是否可以仅将一个API控制器类的MediaTypeFormatter更改为JSON?

Is it possible to change the MediaTypeFormatter to JSON for only one API Controller class?

我的问题不是返回JSON，我通过返回HttpResponseMessage对此进行了放大:

My problem is not returning JSON, I have accumplished this with returning HttpResponseMessage:

return new HttpResponseMessage
{
    Content = new ObjectContent<string>("Hello world", new JsonMediaTypeFormatter()),
    StatusCode = HttpStatusCode.OK
};

这是我提出的要求.如果我有一个具有两个属性的对象:

It's on the request I get the problem. If I have an object with two properties:

public class VMRegistrant 
{
    public int MerchantId { get; set; }
    public string Email { get; set; }
}

我的控制器操作将VMRegistrant作为参数:

And my controller action takes the VMRegistrant as argument:

public HttpResponseMessage CreateRegistrant(VMRegistrant registrant)
{
    // Save registrant in db...
}

但是问题是当我使用JSON调用动作时，它失败了.

But the problem is when I call the action with JSON it fails.

推荐答案

您可以让控制器返回 IHttpActionResult 并使用扩展方法

You can have your controller return an IHttpActionResult and use the extension method HttpRequestMessageExtensions.CreateResponse<T> and specify the formatter you want to use:

public IHttpActionResult Foo()
{
    var bar = new Bar { Message = "Hello" };
    return Request.CreateResponse(HttpStatusCode.OK, bar, new MediaTypeHeaderValue("application/json"));
}

另一种可能性是使用 ApiController.Content 方法:

Another possibility is to use the ApiController.Content method:

public IHttpActionResult Foo()
{
    var bar = new Bar { Message = "Hello" };
    return Content(HttpStatusCode.OK, bar, new JsonMediaTypeFormatter(), new MediaTypeHeaderValue("application/json"));
}

一种可能性是，通过从流中读取并使用JSON解析器(例如Json.NET)从JSON中创建对象，来从 Request 对象自己读取和反序列化内容:

One possibility is to read and deserialize the content yourself from the Request object via reading from the stream and using a JSON parser such as Json.NET to create the object from JSON:

public async Task<IHttpActionResult> FooAsync()
{
      var json = await Request.Content.ReadAsStringAsync();
      var content = JsonConvert.DeserializeObject<VMRegistrant>(json);
}

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