C#执行CMD.exe命令并根据执行结果判断是否成功

    public static void RunCmd(string cmd, out string output)
    {
        cmd = cmd.Trim().TrimEnd('&') + "&exit";//说明：不管命令是否成功均执行exit命令，否则当调用ReadToEnd()方法时，会处于假死状态
        using (System.Diagnostics.Process p = new System.Diagnostics.Process())
        {
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false; //是否使用操作系统shell启动
            p.StartInfo.RedirectStandardInput = true; //接受来自调用程序的输入信息
            p.StartInfo.RedirectStandardOutput = true; //由调用程序获取输出信息
            p.StartInfo.RedirectStandardError = true; //重定向标准错误输出
            p.StartInfo.CreateNoWindow = true; //不显示程序窗口
            p.Start();//启动程序

            //向cmd窗口写入命令
            p.StandardInput.WriteLine(cmd);
            p.StandardInput.AutoFlush = true;

            //获取cmd窗口的输出信息
            output = p.StandardOutput.ReadToEnd();
            p.WaitForExit();//等待程序执行完退出进程
            p.Close();
        }
    }

 private void button3_Click(object sender, EventArgs e)
    {
        string cmd = @"ipconfig /flushdns";
        string output = "";
        try
        {
            RunCmd(cmd, out output);
            Regex reg = new Regex("Successfully|成功");//提取执行结果正则判断是否成功
            Match match = reg.Match(output);
            if (match.Success)
            {
                MessageBox.Show("Successfully flushed the DNS Resolver Cache.", "OK", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("发生错误请重试", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }
        }
        catch
        {
            MessageBox.Show("发生错误此功能故障", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

    }