从Dictionary<>中以区域性不变/大小写不变的方式查找值

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary<string, string> dictionary = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);
        dictionary.Add("Key1", "Value1");
        dictionary.Add("Key2", "Value2");
        dictionary.Add("Key3", "Value3");

        string keyToFind = "key2";
        string value;

        if (dictionary.TryGetValue(keyToFind, out value))
        {
            Console.WriteLine("找到了键 '{0}' 对应的值：{1}", keyToFind, value);
        }
        else
        {
            Console.WriteLine("未找到键 '{0}'", keyToFind);
        }
    }
}