C# 调用cmd.exe的方法

网上有很多用C#调用cmd的方法，大致如下：

private void ExecuteCmd(string command)
        {
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";

            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.CreateNoWindow = true;

            p.Start();
            p.StandardInput.WriteLine(command);
            p.StandardInput.WriteLine("exit");
            p.WaitForExit();
            this.textBox1.Text=textBox1.Text+ p.StandardOutput.ReadToEnd();
            p.Close();
        }

上面代码有几个不足，一是必须要exit那一句，否则就会死循环。再就是每次执行Execute执行cmd后，都必须等到cmd执行完且

cmd.exe进程退出，才能读到结果。有时候这样会让我们的应用程序失去操作的连续性。
事实上，通过两个线程，一个访问输入管道，一个访问输出管道，可以很容易实现持续性的效果，下面是一个Console程序：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Diagnostics;

namespace cmdtest
{
    class Program
    {
        public static string cmd_str;
        public static string cmd_outstr;

        public static Process p = new Process();

        static void Main(string[] args)
        {
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = true;
            p.Start();


            cmd_str = "";
            cmd_outstr = "";

            Thread t1 = new Thread(new ThreadStart(DoCmdThread));
            t1.Start();

            Thread t2 = new Thread(new ThreadStart(OutCmdThread));
            t2.Start();

            while(true)
            {
                cmd_str = Console.ReadLine();
                Thread.Sleep(10);

                if (cmd_str == "exit")
                    break;
            }
        }

        public static void DoCmdThread()
        {
            while (true)
            {
                if (cmd_str == "exit")
                    break;
                if (cmd_str != "")
                {
                    p.StandardInput.WriteLine(cmd_str);
                    //p.StandardInput.WriteLine("cd");
                    cmd_str = "";
                }

                Thread.Sleep(1);
            }
        }

        public static void OutCmdThread()
        {
            while (true)
            {
                if (cmd_str == "exit")
                {
                    p.StandardInput.WriteLine("exit");
                    p.WaitForExit();
                    p.Close();
                    break;
                }
                cmd_outstr = p.StandardOutput.ReadLine();

                while(cmd_outstr != "")
                {
                    Console.WriteLine(cmd_outstr);
                    cmd_outstr = p.StandardOutput.ReadLine();
                }

                char[] ch = new char[256];
                int c = p.StandardOutput.Read(ch, 0, 256);
                if (c > 0)
                {
                  
                    Console.Write(ch,0,c);
                }

                Thread.Sleep(1);
            }
        }
    }
}