Asp.net mvc 4 从控制台创建WebAPI post以在json数据中包含$type

我正在创建对象并将它们发布到webapi。基本上，我就是无法将该死的东西序列化，以便在json中包含$type信息。下面是我试图编写的代码。之后就是我所期望的json

       var cds = new List<CreditDefaultSwaps>()
        {
            new CreditDefaultSwaps() { ModelNumber = "SP8A1ETA", BrokerSpread = 0},
            new CreditDefaultSwaps() { ModelNumber = "SP3A0TU1", BrokerSpread = 0},
            new CreditDefaultSwaps() { ModelNumber = "SP4A102V", BrokerSpread = 0}
        };

        var client = new HttpClient {BaseAddress = new Uri("http://localhost/BloombergWebAPI/api/")};

        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        // set up request object
        var oContract = new WebApiDataServiceRequest
        {
            RequestType = ReferenceDataRequestServiceTypes.ReferenceDataRequest,
            SwapType = BloombergWebAPIMarshal.SwapType.CDS,
            SecurityList = cds
        };

        Tried something like this and the var content was formatted as I would expect
        however I couldn't post the data using postasjsonasync

        //var content = JsonConvert.SerializeObject(oContract, Formatting.Indented,
        //    new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Objects });

           Console.ReadLine();

        var response = client.PostAsJsonAsync("bloombergapi/processbloombergrequest", oContract).Result;

---

创建了另一个重载，使用此调用生成正确的请求：

var response = client.PostAsJsonAsync("processbloombergrequest", oContract, TypeNameHandling.Objects).Result

这是新的过载

public static Task<HttpResponseMessage> PostAsJsonAsync<T>(this HttpClient client, string requestUri, T value, TypeNameHandling typeNameHandling)
{

    return client.PostAsJsonAsync<T>(requestUri, value, CancellationToken.None, typeNameHandling);
}

public static Task<HttpResponseMessage> PostAsJsonAsync<T>(this HttpClient client, string requestUri, T value, CancellationToken cancellationToken, TypeNameHandling typeNameHandling)
{
    var formatter = new JsonMediaTypeFormatter
    {
        SerializerSettings = new JsonSerializerSettings()
        {
            TypeNameHandling = typeNameHandling
        }
    };

    return client.PostAsync<T>(requestUri, value, formatter, cancellationToken);
}

公共静态任务PostAsJsonAsync（此HttpClient客户端，字符串请求URI，T值，TypeNameHandling TypeNameHandling）
{
返回client.PostAsJsonAsync（requestUri，value，CancellationToken.None，typenameholling）；
}
公共静态任务PostAsJsonAsync（此HttpClient客户端，字符串请求URI，T值，CancellationToken CancellationToken，TypeNameHandling TypeNameHandling）
{
var formatter=新的JsonMediaTypeFormatter
{
SerializerSettings=新JsonSerializerSettings（）
{
TypeNameHandling=TypeNameHandling
}
};
返回client.PostAsync（requestUri、值、格式化程序、cancellationToken）；
}

public static Task<HttpResponseMessage> PostAsJsonAsync<T>(this HttpClient client, string requestUri, T value, TypeNameHandling typeNameHandling)
{

    return client.PostAsJsonAsync<T>(requestUri, value, CancellationToken.None, typeNameHandling);
}

public static Task<HttpResponseMessage> PostAsJsonAsync<T>(this HttpClient client, string requestUri, T value, CancellationToken cancellationToken, TypeNameHandling typeNameHandling)
{
    var formatter = new JsonMediaTypeFormatter
    {
        SerializerSettings = new JsonSerializerSettings()
        {
            TypeNameHandling = typeNameHandling
        }
    };

    return client.PostAsync<T>(requestUri, value, formatter, cancellationToken);
}