扩展方法需要动态泛型类型的异常 [英] Extension method to Exception requiring dynamic generic type

问题描述

此问题以前以不同的方式提出，但答案并不能帮助我，因为（1）我无法控制内置的异常类，和（2） Activator.CreateInstance（）返回一个对象/实例，我需要一个真正的动态类型。

This question has been asked in different ways before, but the answers don't help me, because (1) I don't have control over the built-in Exception classes, and (2) Activator.CreateInstance() returns an object/instance, where I need a true dynamic type.

我正在尝试创建一个扩展方法，允许我从我的WCF服务中抛出一个 FaultException ，这是基于我捕获的异常。例如：

I'm trying to create an extension method that allows me to throw a FaultException out of my WCF service, based off the exception I catch. For example:

try {
    ...
}
catch (ArgumentNullException exc) {
    throw new FaultException<ArgumentNullException>(exc);
}

是直截了当的。但是，如果我想以一般的方式来扩展它，我会使用扩展类，例如：

is straight-forward. But if I want to extend this in a general way, I'd use an extension class, like:

try {
    ...
}
catch (Exception exc) {
    exc.ThrowFaultException();
}

我挂断了，当然是扩展方法的实现：

Where I get hung up, of course, is the implementation of the extension method:

public static void ThrowFaultException(this Exception exc) {

    //  Gives me the correct type...
    Type exceptionType = exc.GetType();

    //  But how the heck do I use it?
    throw new FaultException<???>(exc);
}

答案 here 和这里没有帮助。任何想法？

The answers here and here don't help. Any ideas?

推荐答案

尝试这样：

public static void ThrowFaultException<TException>(this TException ex) where TException : System.Exception
{
    throw new FaultException<TException>(ex);
}

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