using System;
using System.Collections;
class ForeachApp
{
public static void Main()
{
// 把环境变量中所有的值取出来，放到变量environment中
IDictionary environment = Environment.GetEnvironmentVariables();
// 打印表头
Console.WriteLine("环境变量名\t=\t环境变量值");
// 遍历environment中所有键值
foreach (string environmentKey in environment.Keys)
{
// 打印出所有环境变量的名称和值
Console.WriteLine("{0}\t=\t{1}", environmentKey, environment[environmentKey].ToString());
}
}
}
