[转]在C#里，如何执行cmd里的常用dos命令

using System;
using System.Diagnostics;

namespace Tipo.Tools.Utility
{
 /// <summary>
 /// 常用Dos命令操作
 /// </summary>
 public class DosCommand
 {
  private Process process=null;
  private string _errmsg;

  public DosCommand()
  {
   process = new Process();
   process.StartInfo.FileName = "cmd.exe";
   process.StartInfo.UseShellExecute = false;
   process.StartInfo.RedirectStandardInput = true;
   process.StartInfo.RedirectStandardOutput = true;
   process.StartInfo.RedirectStandardError = true;
   process.StartInfo.CreateNoWindow = false;
   process.Start();
  }

  //检测文件或目录是否存在
  public string exist(string path)
  {
   process.StandardInput.WriteLine(string.Format("dir \"{0}\"",path));
   process.StandardInput.WriteLine("exit");
   _errmsg = process.StandardError.ReadToEnd();
   return _errmsg;
  }
 }
}