抱歉，这有点长，但我相信所有信息都是必需的：
- .NET 4.5，内置 JSON.NET
- 我定义了以下行为：
即：
<behaviors>
<endpointBehaviors>
<behavior name="WebBehavior">
<webHttp helpEnabled="true" automaticFormatSelectionEnabled="true" />
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior name="ServiceBehaviour">
<serviceMetadata httpGetEnabled="true" httpGetBinding="" httpGetBindingConfiguration="" />
<serviceDebug includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
</behaviors>
为我服务：
[ServiceContract]
public interface IWebServiceSrms
{
//-- Countries --------------------------------------------------------
[OperationContract]
[WebInvoke(Method = "GET", BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "/Countries")]
[return: MessageParameter(Name = "Countries")]
List<Country> Countries();
[OperationContract]
[WebInvoke(Method = "GET", BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "/Countries/{aId}")]
[return: MessageParameter(Name = "Country")]
Country Country(string aId);
//-- /Countries -------------------------------------------------------
}
我已经实现了 IErrorHandler，然后实现了以下ErrorResponse以将 JSON 响应返回给客户端：
[DataContract(IsReference = false)]
public class ErrorResponse
{
public ErrorResponse(ErrorTypes aErrorType, ErrorNumber aErrorNumber, string aMessage)
{
ApiErrorBase = new ApiErrorBase {ErrorNumber = aErrorNumber, ErrorType = aErrorType, Message = aMessage};
}
public ErrorResponse(IApiErrorBase aApiErrorBase)
{
ApiErrorBase = aApiErrorBase as ApiErrorBase;
}
[DataMember(Name = "ApiError")]
public ApiErrorBase ApiErrorBase { get; set; }
并且IApiErrorBase定义为：
public interface IApiErrorBase
{
ErrorNumber ErrorNumber { get; set; }
ErrorTypes ErrorType { get; set; }
string Message { get; set; }
}
和一个具体的ApiErrorNase定义为：
[DataContract(IsReference = false)]
public class ApiErrorBase : IApiErrorBase
{
[DataMember(Name = "ErrorType")]
private string ErrType
{
get { return ErrorType.ToString(); }
set { return; }
}
public ApiErrorBase()
{
ErrorNumber = ErrorNumber.ErrUnknown;
ErrorType = ErrorTypes.UnknownError;
Message = "";
}
[DataMember]
public ErrorNumber ErrorNumber { get; set; }
[IgnoreDataMember]
public ErrorTypes ErrorType { get; set; }
[DataMember]
public string Message { get; set; }
}
然后我有一个辅助方法来引发异常，最终将错误返回给客户端：
public static class ErrorHelper
{
public static void ReturnErrorToClient<T>(ErrorNumber aErrorNumber, ErrorTypes aErrorType, string aMessage, HttpStatusCode aHttpStatusCode = HttpStatusCode.BadRequest) where T : IApiErrorBase, new()
{
T apiErrorBase = new T {ErrorNumber = aErrorNumber, ErrorType = aErrorType, Message = aMessage};
ErrorResponse errorResponse = new ErrorResponse(apiErrorBase);
throw new WebFaultException<ErrorResponse>(errorResponse, aHttpStatusCode);
}
}
在我创建以下ApiErrorAnotherOne 后代类之前，这一切都运行良好并且符合预期：
[DataContract(IsReference = false)]
[KnownType(typeof(ApiErrorAnotherOne))]
public class ApiErrorAnotherOne : ApiErrorBase
{
[DataMember]
public string Homer { get; set; }
public ApiErrorAnotherOne()
{
Homer = "You don't make friends with salad.";
}
}
第一个问题是我必须添加[KnownType(typeof(ApiErrorAnotherOne))]因为我收到以下错误：
aError = {"Type 'WebService_SRMS.Errors.ApiErrorSomeOtherOne' with data contract name 'ApiErrorSomeOtherOne:http://schemas.datacontract.org/2004/07/WebService_SRMS.Errors' is not expected. Consider using a DataContractResolver or add any types not known statically to the list of kn...
但是现在我的 JSON 响应包括__type如下：
{
"ApiError": {
"__type": "ApiErrorDono:#WebService_SRMS.Errors",
"ErrorNumber": 1,
"ErrorType": "UnknownError",
"Message": "",
"Homer": "You don't make friends with salad."
}
}
所以我的问题是：
- 为什么 __type 出现在响应中？（其余的响应是我想要的）
- 如何从 JSON 响应中删除 __type？