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C#中的种姓例外
原标题:Casting Exceptions in C#

在试图做到这一点时,我为什么会收到<条码>。

throw (ArgumentNullException)(new Exception("errormessage", null));

这是以下职能的简化版本。

public static void Require<T>(bool assertion, string message, Exception innerException) where T: Exception
    {
        if (!assertion)
        {
            throw (T)(new Exception(message, innerException));
        }
    }

完整的错误信息是:

System.InvalidCastException: Unable to emect of category System. 除类型系统外。 ArgumentNullException .

最佳回答

我的印象是,你正在对一个基类进行即时处理,并试图把它当作一个衍生的类别。 我不认为你能够这样做,因为例外比阿古特努勒特约多。 你们可以通过其他方式来做到这一点。

问题回答

您不妨尝试:

public static void Require<T>(bool assertion, string message,
    Exception innerException) where T: Exception
{
    if (!assertion)
    {
        throw (Exception) System.Activator.CreateInstance(
            typeof(T), message, innerException);
    }
}

系统。 例外不是你所投的标语,而是简单明了。 如果你想要提高这种类型,则直接属于不同类型的例外情况。





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