为什么我的C#客户端,POST到我的WCF REST服务,返回(400)错误请求？

我正在尝试向我编写的简单WCF服务发送POST请求,但我一直收到400错误请求.我正在尝试将JSON数据发送到服务.谁能发现我做错了什么？:-)

这是我的服务界面:

public interface Itestservice
{
    [OperationContract]
    [WebInvoke(
        Method = "POST",
        UriTemplate = "/create",
        RequestFormat = WebMessageFormat.Json,
        ResponseFormat = WebMessageFormat.Json)]
    String Create(TestData testData);
}

实施:

public class testservice: Itestservice
{
    public String Create(TestData testData)
    {
        return "Hello, your test data is " + testData.SomeData;
    }
}

DataContract:

[DataContract]
public class TestData
{
    [DataMember]
    public String SomeData { get; set; }
}

最后我的客户端代码:

private static void TestCreatePost()
{
    Console.WriteLine("testservice.svc/create POST:");
    Console.WriteLine("-----------------------");

    Uri address = new Uri("http://localhost:" + PORT + "/testweb/testservice.svc/create");

    // Create the web request  
    HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;

    // Set type to POST  
    request.Method = "POST";
    request.ContentType = "application/x-www-form-urlencoded";
    //request.ContentType = "text/x-json";

    // Create the data we want to send  
    string data = "{\"SomeData\":\"someTestData\"}";

    // Create a byte array of the data we want to send  
    byte[] byteData = UTF8Encoding.UTF8.GetBytes(data);

    // Set the content length in the request headers  
    request.ContentLength = byteData.Length;

    // Write data  
    using (Stream postStream = request.GetRequestStream())
    {
        postStream.Write(byteData, 0, byteData.Length);
    }

    // Get response  
    using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
    {
        // Get the response stream  
        StreamReader reader = new StreamReader(response.GetResponseStream());

        // Console application output  
        Console.WriteLine(reader.ReadToEnd());
    }

    Console.WriteLine();
    Console.WriteLine();
}

谁能想到我可能做错了什么？正如你在C#客户端中看到的那样,我已经尝试了applicationType/x-www-form-urlencoded和text/x-json for ContentType,认为它可能与它有关,但它似乎没有.我已经尝试了这个相同服务的GET版本,它工作正常,并返回一个JSON版本的TestData没有问题.但是对于POST,好吧,我现在相当坚持这个:-(

你有没有试过"application/json"而不是"text/x-json".根据此 Stack Overflow问题,应用程序/ json是唯一有效的json媒体类型.