关于c#：WCF服务将不会返回500 Internal Server Error。相反，只有400错误请求

WCF service will not return 500 Internal Server Error. Instead, only 400 Bad Request

我已经创建了一个简单的RESTful WCF文件流服务。发生错误时，我希望生成一个500 Interal Server Error响应代码。而是，仅生成400个错误请求。
当请求有效时，我会收到正确的响应(200 OK)，但是即使抛出异常，我也会得到400。

IFileService：

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[ServiceContract]
public interface IFileService
{
[OperationContract]
[WebInvoke(Method ="GET",
BodyStyle = WebMessageBodyStyle.Bare,
ResponseFormat = WebMessageFormat.Json,
UriTemplate ="/DownloadConfig")]
Stream Download();
}

FileService：

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[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
public class GCConfigFileService : IGCConfigFileService
{
public Stream Download()
{
throw new Exception();
}
}

Web.Config

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简单的：

尝试throw new WebFaultException(HttpStatusCode.InternalServerError);

要指定错误详细信息：

1	throw new WebFaultException<string>("Custom Error Message!", HttpStatusCode.InternalServerError);

先进的：

如果要通过为每个异常定义HTTP状态来更好地处理异常，则需要创建一个自定义ErrorHandler类，例如：

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class HttpErrorHandler : IErrorHandler
{
public bool HandleError(Exception error)
{
return false;
}

public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
{
if (fault != null)
{
HttpResponseMessageProperty properties = new HttpResponseMessageProperty();
properties.StatusCode = HttpStatusCode.InternalServerError;
fault.Properties.Add(HttpResponseMessageProperty.Name, properties);
}
}
}

然后，您需要创建服务行为以附加到您的服务：

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class ErrorBehaviorAttribute : Attribute, IServiceBehavior
{
Type errorHandlerType;

public ErrorBehaviorAttribute(Type errorHandlerType)
{
this.errorHandlerType = errorHandlerType;
}

public void Validate(ServiceDescription description, ServiceHostBase serviceHostBase)
{
}

public void AddBindingParameters(ServiceDescription description, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection parameters)
{
}

public void ApplyDispatchBehavior(ServiceDescription description, ServiceHostBase serviceHostBase)
{
IErrorHandler errorHandler;

errorHandler = (IErrorHandler)Activator.CreateInstance(errorHandlerType);
foreach (ChannelDispatcherBase channelDispatcherBase in serviceHostBase.ChannelDispatchers)
{
ChannelDispatcher channelDispatcher = channelDispatcherBase as ChannelDispatcher;
channelDispatcher.ErrorHandlers.Add(errorHandler);
}
}
}

附加到行为：

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[ServiceContract]
public interface IService
{
[OperationContract(Action ="*", ReplyAction ="*")]
Message Action(Message m);
}

[ErrorBehavior(typeof(HttpErrorHandler))]
public class Service : IService
{
public Message Action(Message m)
{
throw new FaultException("!");
}
}