"此错误的创建者未指定原因"例外

Question

我在WCF服务中有以下代码,根据某些情况抛出自定义错误.我得到一个"这个错误的创建者没有指定原因"例外.我究竟做错了什么？

//source code
if(!DidItPass)
{
    InvalidRoutingCodeFault fault = new InvalidRoutingCodeFault("Invalid Routing Code - No Approval Started");
    throw new FaultException<InvalidRoutingCodeFault>(fault);
}

//operation contract
[OperationContract]
[FaultContract(typeof(InvalidRoutingCodeFault))]
bool MyMethod();

//data contract
[DataContract(Namespace="http://myuri.org/Simple")]
public class InvalidRoutingCodeFault
{
    private string m_ErrorMessage = string.Empty;

    public InvalidRoutingCodeFault(string message)
    {
        this.m_ErrorMessage = message;
    }

    [DataMember]
    public string ErrorMessage
    {
        get { return this.m_ErrorMessage; }
        set { this.m_ErrorMessage = value; }
    }
}

Answer 1

经过一些额外的研究,以下修改后的代码有效:

if(!DidItPass)
{    
    InvalidRoutingCodeFault fault = new InvalidRoutingCodeFault("Invalid Routing Code - No Approval Started");    
    throw new FaultException<InvalidRoutingCodeFault>(fault, new FaultReason("Invalid Routing Code - No Approval Started"));
}

Answer 2

简短的回答是你没有做错什么,只是错误地读取结果.

在客户端捕获错误时,捕获的是类型System.ServiceModel.FaultException<InvalidRoutingCodeFault>.
您的InvalidRoutingCodeFault对象实际上.detail是FaultException 的属性.所以....

//客户端代码

private static void InvokeMyMethod() 
{ 
    ServiceClient service = new MyService.ServiceClient(); 

    try 
    { 
        service.MyMethod(); 
    } 
    catch (System.ServiceModel.FaultException<InvalidRoutingCodeFault> ex) 
    { 
        // This will output the "Message" property of the System.ServiceModel.FaultException
        // 'The creator of this fault did not specify a Reason' if not specified when thrown
        Console.WriteLine("faultException Message: " + ex.Message);    
        // This will output the ErrorMessage property of your InvalidRoutingCodeFault type
        Console.WriteLine("InvalidRoutingCodeFault Message: " + ex.Detail.ErrorMessage);    
    } 
}

FaultException的Message属性是错误页面上显示的内容,因此如果它没有像John Egerton的帖子那样填充,您将看到"此错误的创建者未指定原因"消息.要轻松填充它,请在服务中抛出错误时使用两个参数构造函数,如下所示,从您的错误类型传递错误消息:

InvalidRoutingCodeFault fault = new InvalidRoutingCodeFault("Invalid Routing Code - No Approval Started");                                          
throw new FaultException<InvalidRoutingCodeFault>(fault, new FaultReason(fault.ErrorMessage));                                      

Answer 3

serviceDebug includeExceptionDetailInFaults="true"

不是解决方案

以下代码甚至可以使用 serviceDebug includeExceptionDetailInFaults="false"

// data contract 

[DataContract]
public class FormatFault
{
    private string additionalDetails;

    [DataMember]
    public string AdditionalDetails
    {
        get { return additionalDetails; }
        set { additionalDetails = value; }
    }
}

// interface method declaration

    [OperationContract]
    [FaultContract(typeof(FormatFault))]
    void DoWork2();

// service method implementation

    public void DoWork2()
    {
        try
        {
            int i = int.Parse("Abcd");
        }
        catch (FormatException ex)
        {
            FormatFault fault = new FormatFault();
            fault.AdditionalDetails = ex.Message;
            throw new FaultException<FormatFault>(fault);
        }
    }

// client calling code

    private static void InvokeWCF2()
    {
        ServiceClient service = new ServiceClient();

        try
        {
            service.DoWork2();
        }
        catch (FaultException<FormatFault> e)
        {
            // This is a strongly typed try catch instead of the weakly typed where we need to do -- if (e.Code.Name == "Format_Error")
            Console.WriteLine("Handling format exception: " + e.Detail.AdditionalDetails);   
        }
    }

如果不需要,则无需添加故障原因.只需确保FaultContract属性正确即可

Answer 4

我使用两个参数构造函数解决了这个问题.

// service method implementation

 throw new FaultException<FormatFault>(fault,new FaultReason(fault.CustomFaultMassage)); 

CustomFaultMassage是数据合同的属性.