C#:预期某种类型时抛出的异常

Question

我知道这种代码不是最佳实践，但在某些情况下我发现它是一种更简单的解决方案:

if (obj.Foo is Xxxx)
{
   // Do something
}
else if (obj.Foo is Yyyy) 
{
   // Do something
}
else
{
    throw new Exception("Type " + obj.Foo.GetType() + " is not handled.");
}

有人知道在这种情况下是否可以抛出内置异常吗？

Answer 1

如果 obj 是方法的参数，你应该抛出 ArgumentException :

throw new ArgumentException("Type " + obj.Foo.GetType() + " is not handled.", "obj");

否则，您可能应该抛出 InvalidOperationException或创建您自己的异常(exception)，如下所示:

///<summary>The exception thrown because of ...</summary>
[Serializable]
public class MyException : Exception {
    ///<summary>Creates a MyException with the default message.</summary>
    public MyException () : this("An error occurred") { }

    ///<summary>Creates a MyException with the given message.</summary>
    public MyException (string message) : base(message) { }
    ///<summary>Creates a MyException with the given message and inner exception.</summary>
    public MyException (string message, Exception inner) : base(message, inner) { }
    ///<summary>Deserializes a MyException .</summary>
    protected MyException (SerializationInfo info, StreamingContext context) : base(info, context) { }
}