当“另一侧"发生时，不执行任何操作三元运算符到达? [英] Do nothing when "other side" of ternary operator is reached?

问题描述

注意:我之前曾经看过这个问题( a ， b ， c )，但这些都不是在C#中也无济于事.

Note: I've seen this question asked sometimes before (a, b, c), but neither of these was in C#, nor helpful.

假设我正在使用?:这样的三元运算符(在 false 情况下不执行任何操作):

Assume I'm using the ? : ternary operator like this (to do nothing when false is the case):

r==5? r=0 : <nothing> ;

我遇到一个错误.在此放置一些东西显然可以解决问题.我该如何在不做任何随机空函数的情况下让另一端保持空状态?

I'm getting an error. Putting something there will obviously solve the problem. How can I still keep the other side empty without making some random empty function?

推荐答案

您不能.条件?:运算符的全部要点是它对 expression 求值.您甚至不能只使用:

You can't. The whole point of the conditional ?: operator is that it evaluates an expression. You can't even just use:

Foo() ? Bar() : Baz();

...因为这不是声明.您必须对结果做些事情...例如，就像访问属性一样.

... because that isn't a statement. You have to do something with the result... just like when you access a property, for example.

如果只想在满足特定条件时才执行一段代码，则?:运算符不是您想要的-您需要 if 语句:

If you want to only execute a piece of code when a specific condition is met, the ?: operator isn't what you want - you want an if statement:

if (foo)
{
    bar();
}

就这么简单.请勿试图将条件运算符扭曲为原本不应该的东西.

It's as simple as that. Don't try to twist the conditional operator into something it's not meant to be.

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