C#-在一行代码中将一个值与多个值进行比较的更漂亮的方法 [英] C# - Prettier way to compare one value against multiple values in a single line of code

问题描述

我有这段代码:

if (filter != RECENT &&
    filter != TODAY &&
    filter != WEEK &&
    filter != MONTH &&
    filter != ALLTIME)
{
    filter = RECENT;
}

请注意， filter 是一个 string ，并将其与 const string 类型进行比较.有什么方法可以内联地进行并使其更具可读性吗?使用三元运算符并不能使它变得更好，因为我仍然必须重复 filter！= XXXXX

Note that filter is a string and it's compared against const string types. Is there any way to do this inline and have it be more readable? Doing it with the ternary operator doesn't make it much better since I still have to repeat filter != XXXXX

filter = filter != RECENT &&
         filter != TODAY &&
         filter != WEEK &&
         filter != MONTH &&
         filter != ALLTIME ? RECENT : filter;

这显然行不通

filter = filter != RECENT && TODAY && WEEK && MONTH && ALLTIME ? RECENT : filter;

是否有任何更漂亮的方法(更漂亮的==所有逻辑都必须在一行代码中)进行此比较?更具体地说，是防止 filter！= XXXXX 重复.

Is there any prettier way (prettier == all of the logic must be in a single line of code) to do this comparison? More specifically to prevent filter != XXXXX repetition.

请注意，性能并不是我对此问题的主要关注.

推荐答案

我更喜欢创建扩展方法.

I Prefer create an extension method .

  public static bool NotIn(this string filter , params string[] valuesToCompare)
    {
        var result = true;
        foreach (var item in valuesToCompare)
        {
            if (filter == item) return false;
        }
        return result;
    }

并使用类似

if( filter.NotIn("RECENT", "TODAY ", "WEEK ", "MONTH", "ALLTIME"))
  {
     filter = "RECENT";
  }

这篇关于C#-在一行代码中将一个值与多个值进行比较的更漂亮的方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！