C# 获取环境变量

using System;
using System.Collections;

namespace DemoConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            // 打印表头
            Console.WriteLine("环境变量名\t=\t环境变量值");

            // 把环境变量中所有的值取出来，放到变量environments中
            IDictionary environments = Environment.GetEnvironmentVariables();

            // 遍历environments中所有键值
            foreach (string environmentKey in environments.Keys)
            {
                // 打印出所有环境变量的名称和值
                Console.WriteLine("{0}\t=\t{1}", environmentKey, environments[environmentKey].ToString());
            }

            Console.Read();
        }
    }
}