在c＃多变量switch语句 [英] Multi-variable switch statement in c#

问题描述

我想用一个switch语句这需要几个变量，看起来是这样的：

I would like use a switch statement which takes several variables and looks like this:

switch (intVal1, strVal2, boolVal3)
{
   case 1, "hello", false:
      break;
   case 2, "world", false:
      break;
   case 2, "hello", false:

   etc ....
}

就我个人来说，这是不可能在C＃纯，问题是：有任何3D党库它实现了这样的事情在一个不错的和有效的方法。 （我不希望使用的原因很明显嵌套switch语句）。

As far as I am concerned this is not possible in c# pure, the question is: is there any 3d party library which implements something like this in a nice and efficient way. (And I do not want to use nested switch statements for obvious reasons).

推荐答案

有没有内置的功能，要做到这一点在C＃中，我不知道任何图书馆这样做。

There is no built-in functionality to do this in C#, and I don't know about any library to do this.

下面是另一种方法，使用元组和扩展方法：

Here is an alternative approach, using Tuple and extension methods:

using System;

static class CompareTuple {
    public static bool Compare<T1, T2, T3>(this Tuple<T1, T2, T3> value, T1 v1, T2 v2, T3 v3) {
        return value.Item1.Equals(v1) && value.Item2.Equals(v2) && value.Item3.Equals(v3); 
    }
}

class Program {
    static void Main(string[] args) {
        var t = new Tuple<int, int, bool>(1, 2, false);
        if (t.Compare(1, 1, false)) {
            // 1st case
        } else if (t.Compare(1, 2, false)) {
            // 2nd case
        } else { 
            // default
        }
    }
}

这基本上是做无非就是提供了一个方便的语法检查多个值 - 与使用开关的多个IFS而不是

This is basically doing nothing more than providing a convenient syntax to check for multiple values - and using multiple ifs instead of a switch.

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