企业库,异常处理块:不能使用自定义异常来包装WrapHandler

时间:2013-02-22 15:57:01

标签: c# .net exception-handling enterprise-library

我想使用企业库异常处理块来进行异常处理。 为了尝试它,我编写了一个简单的应用程序,它抛出并处理异常,在玩它时我遇到了以下内容:

当我使用像System.ApplicationException这样的BCL异常时,抛出的异常会被包装起来:

策略:

<exceptionPolicies>
    <add name="DalPolicy">
        <exceptionTypes>
            <add name="DbPrimitiveHandledException" type="Exceptions.DbPrimitiveHandledException, Exceptions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
                postHandlingAction="ThrowNewException">
                <exceptionHandlers>
                    <add name="DAL Wrap Handler" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.WrapHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                        exceptionMessage="Dal Wrapper Exception" wrapExceptionType="System.ApplicationException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
                </exceptionHandlers>
            </add>
        </exceptionTypes>
    </add>
    ...
</exceptionPolicies>

控制台输出:

  

System.ApplicationException:Dal Wrapper Exception ---&gt;   Exceptions.DbPrimitiveHandledException:Db Handled Policed exception ...

但是当我尝试使用自己的例外时:

public class DalWrapperException : Exception
{
    public DalWrapperException()
    { }

    public DalWrapperException(string message)
        : base(message)
    { }
}

策略:

<exceptionPolicies>
    <add name="DalPolicy">
        <exceptionTypes>
            <add name="DbPrimitiveHandledException" type="Exceptions.DbPrimitiveHandledException, Exceptions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
                postHandlingAction="ThrowNewException">
                <exceptionHandlers>
                    <add name="DAL Wrap Handler" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.WrapHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                        exceptionMessage="Dal Wrapper Exception" wrapExceptionType="Exceptions.DalWrapperException, Exceptions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
                </exceptionHandlers>
            </add>
        </exceptionTypes>
    </add>
    ...
</exceptionPolicies>

包装不起作用 - 我收到ExceptionHandlingException:

Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionHandlingException: Unable to handle exception: 'WrapHandler'.

有人可以告诉我我的异常或配置有什么问题吗? 提前致谢

1 个答案:

答案 0 :(得分:3)

问题在于异常类。它必须实现一个接受内部异常的构造函数:

public class DalWrapperException : Exception
{
    public DalWrapperException()
    { }

    public DalWrapperException(string message)
        : base(message)
    { }

    public DalWrapperException(string message, Exception innerException)
        : base(message, innerException)
    { }
}