System.Environment使用一例

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace Chapter3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Current OS: {0}", Environment.OSVersion);
            Console.WriteLine("Current Directory: {0}", Environment.CurrentDirectory);
            string[] drivers = Environment.GetLogicalDrives();
            int i = 1;
            foreach (string str in drivers)
            {
                Console.WriteLine("Driver " + i++ + ": " + str);
            }
            Console.WriteLine("Executed version of .NET: {0}", Environment.Version);
            Console.WriteLine("Current Username: " + Environment.UserName);
            Console.WriteLine("Current UserDomainName: " + Environment.UserDomainName);
            //Dictionary<object, object> dict = (Dictionary<object, object>)Environment.GetEnvironmentVariables();
            //Console.WriteLine("Current Environment: ");
            //foreach (KeyValuePair<object, object> keyPair in dict)
            //{
            //    Console.WriteLine("{0}:{1}", keyPair.Key, keyPair.Value);
            //}
            Hashtable ht = (Hashtable)Environment.GetEnvironmentVariables();
            ICollection keys = ht.Keys;
            ArrayList al = new ArrayList(keys);
            al.Sort();
            foreach (object var in al)
            {
                Console.WriteLine("{0}:{1}", var, ht[var]);
            }
            Console.Read();
        }
    }
}