c# - 在 IF 子句中 OR'ing 多个值选项的替代方法是什么？

Question

是否有任何 C# 语法可以使此 if 语句更清晰/更短？

if (token == "(" || token == ")" || token == "+" || token == "-" || token == "*" || token == "/")
{
     //do something
}

Answer 1

像这样:

// create a string with the valid chars
var tokens = "()+-*/";

// this will call the Contains method of the String class
if(tokens.Contains(token))
{
     //do something
}

或者使用数组:(这样您就可以在一个匹配项中验证多个字符。(不包括在此示例中))

// create an array with the valid strings
var tokens = new [] { "(", ")", "+", "-", "*", "/" };

// this will call Contains method of the Enumerable class
if(tokens.Contains(token))
{
     //do something
}