是否可以在变量中存储数学运算(+)并调用该变量，就像您直接使用该运算本身一样 [英] Is it possible to store a math operation (+) in a variable and call on that variable as if you were directly using the operation itself

问题描述

我知道这是一个很奇怪的问题，但是这里有一段代码可以更好地解释我要做什么.

I know this is a weird question but here is a chunk of code to better explain what I am trying to do.

char plus = '+'; //Creating a variable assigning it to the + value.
//Instead of using + we use the variable plus and expect the same outcome.     
Console.WriteLine(1 + plus + 1); 
Console.ReadLine(); //Read the line.

但是由于某种原因，控制台读取了45 ...很奇怪，对吗?因此，如果您了解我的工作意图，您可以解释一下并向我展示如何做吗?

But for some reason the console reads out 45... Weird right? So if you understand what I am trying to do can you explain and show me how?

推荐答案

您可以为此使用委托:

 void int Add( int a, int b ) { return a + b; }
 void int Subtract( int a, int b ) { return a - b; }


 delegate int Operation( int a, int b );

 Operation myOp = Add;
 Console.WriteLine( myOp( 1, 1 ) ); // 2

 myOp = Subtract;
 Console.WriteLine( myOp( 1, 1 ) ); // 0

此外，您可以使用lambda代替命名方法:

Also, you could use lambdas instead of named methods:

 myOp = (a,b) => a + b;

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