C# 字符串比较 : Difference between CurrentCultureIgnoreCase and InvariantCultureIgnoreCase

Question

在C#中做字符串比较时，和a有什么区别

string test = "testvalue";
test.Equals("TESTVALUE", StringComparison.CurrentCultureIgnoreCase);

和

string test = "testvalue";
test.Equals("TESTVALUE", StringComparison.InvariantCultureIgnoreCase);

...无论如何，包含该额外参数是否重要？

Answer 1

其他帖子给出了很好的建议，但我认为展示一个例子可能会更好:

using System;
using System.Globalization;
using System.Threading;

class Test
{
    static void Main()
    {
        CultureInfo turkish = CultureInfo.CreateSpecificCulture("tr");
        Thread.CurrentThread.CurrentCulture = turkish;                

        // In Turkey, "i" does odd things
        string lower = "i";
        string upper = "I";
        
        // Prints False
        Console.WriteLine(lower.Equals(upper, 
            StringComparison.CurrentCultureIgnoreCase));
        // Prints True
        Console.WriteLine(lower.Equals(upper, 
            StringComparison.InvariantCultureIgnoreCase));
    }
}

(毫无疑问，还有很多其他情况 - 这只是我想到的第一个。)