不能处理消息，因为内容类型是“应用程序/json”;charset=utf-8'不是预期的类型'文本/xml;charset = utf - 8 '

I am get the above response when calling a WCF service via ajax json. My calling code is:

当通过ajax json调用WCF服务时，我得到上述响应。我的调用代码是:

<script type="text/javascript">
    $(document).ready(function () {
        $.ajax
        ({
            type: "POST",
            contentType: "application/json; charset=utf-8",
            url: "http://localhost:90/WebServices/UserService.svc/Calculate",
            data: "{}",
            timeout: 10000,
            dataType: "json",
            success: function (response) {
                alert(response)
            },
            error: function (xhr, ajaxOptions, thrownError) {
                alert(xhr.statusText);
                alert(thrownError);
            }
        });
    });
</script>

My service is:

我的服务是:

[ServiceContract]
public interface IUserService
{
    [OperationContract]
    [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Json
     )]
    Answer Calculate();
}

[DataContract]
public class Answer
{
    [DataMember]
    public string answer { get; set; }
}

My method is :

我的方法是:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(IncludeExceptionDetailInFaults = true)]
public class UserService : IUserService
{
    public Answer Calculate()
    {
        Answer answer = new Answer();
        answer.answer="Hello World";
        return answer;
    }
}

I have been battling with for sometime, I see other people have had the same type problem and I tried all there suggestions but still nothing is working.

我一直在和别人争论，我发现其他人也有同样的问题，我尝试了所有的建议，但仍然没有任何效果。

Where is the problem? How can I solve it?

问题在哪里?我该怎么解决呢?

2 个解决方案

#1

I'm guessing here since you didn't show how you defined your endpoint, but I'm pretty sure it's the case. Your endpoint is not defined for web consumption - it's likely using basicHttpBinding. To consume the endpoint via jQuery (or other web/REST clients in general) you need to define an endpoint with the WebHttpBinding, and apply the WebHttpBehavior to it.

我猜是因为你没有展示你是如何定义你的端点的，但我很确定是这样的。您的端点不是为web消费定义的——它很可能使用basicHttpBinding。要使用jQuery(或其他web/REST客户端)使用端点，您需要使用WebHttpBinding定义一个端点，并将WebHttpBehavior应用到它。

There are different ways to define the endpoint correctly. The easiest one is to use the WebServiceHostFactory in your .svc file:

正确定义端点有不同的方法。最简单的方法是使用.svc文件中的WebServiceHostFactory:

UserService.svc:

UserService.svc:

<%@ ServiceHost Language="C#" Debug="true" Service="YourNamespace.UserService"
                Factory="System.ServiceModel.Activation.WebServiceHostFactory" %>

#2

For anyone who lands here by searching: 'content type 'application/json; charset=utf-8' was not the expected type 'text/xml; charset=utf-8'

对于任何通过搜索登录到这里的人:“内容类型”应用程序/json;charset=utf-8'不是预期的类型'文本/xml;charset = utf - 8 '

A similar error was caused in my case by building and running a service without proper attributes. I got this error message when I tried to update the service reference in my client application. It was resolved when I correctly applied '[DataContract]' and '[DataMember]' attributes to my custom classes.

在我的案例中，一个类似的错误是建立和运行一个没有适当属性的服务。当我尝试在我的客户端应用程序中更新服务引用时，我得到了这个错误消息。当我正确地将“[DataContract]”和“[DataMember]”属性应用到我的自定义类时，它就得到了解决。

Edit: This would most likely be applicable if your service was set up and working and then it broke after you edited it.

编辑:如果你的服务是建立和工作的，并且在你编辑它之后它就坏了，这很有可能是适用的。

#1