使用 Case/Switch 和 GetType 确定对象

问题描述

可能重复:
C# - 有没有更好的替代开启类型"?

如果你想切换一种对象，最好的方法是什么?

If you want to switch on a type of object, what is the best way to do this?

private int GetNodeType(NodeDTO node)
{
    switch (node.GetType())
    { 
        case typeof(CasusNodeDTO):
            return 1;
        case typeof(BucketNodeDTO):
            return 3;
        case typeof(BranchNodeDTO):
            return 0;
        case typeof(LeafNodeDTO):
            return 2;
        default:
            return -1;
    }
}

我知道这样不行，但我想知道你如何解决这个问题.if/else 语句在这种情况下是否合适?

I know this doesn't work that way, but I was wondering how you could solve this. Is an if/else statement appropriate in this case?

或者你是用开关把.ToString()加到类型里面?

Or do you use the switch and add .ToString() to the type?

推荐答案

如果我真的必须switch对象的类型，我会使用.ToString().但是，我会不惜一切代价避免它:IDictionary<Type, int> 会做得更好，visitor 可能有点矫枉过正，但除此之外它仍然是一个完美的解决方案.

If I really had to switch on type of object, I'd use .ToString(). However, I would avoid it at all costs: IDictionary<Type, int> will do much better, visitor might be an overkill but otherwise it is still a perfectly fine solution.

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