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以下的代码为new Process() 调用cmd命令，并将结果异步回显到Form的例子：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace CmdCallbackShow
{
    // 1.定义委托
    public delegate void DelReadStdOutput(string result);
    public delegate void DelReadErrOutput(string result);

    public partial class Form1 : Form
    {
        // 2.定义委托事件
        public event DelReadStdOutput ReadStdOutput;
        public event DelReadErrOutput ReadErrOutput;

        public Form1()
        {
            InitializeComponent();
            Init();
        }

        private void Init()
        {
            //3.将相应函数注册到委托事件中
            ReadStdOutput += new DelReadStdOutput(ReadStdOutputAction);
            ReadErrOutput += new DelReadErrOutput(ReadErrOutputAction);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // 启动进程执行相应命令,此例中以执行ping.exe为例
            RealAction("ping.exe", textBox1.Text);
        }
        
        private void RealAction(string StartFileName, string StartFileArg)
        {
            Process CmdProcess = new Process();
            CmdProcess.StartInfo.FileName = StartFileName;      // 命令
            CmdProcess.StartInfo.Arguments = StartFileArg;      // 参数

            CmdProcess.StartInfo.CreateNoWindow = true;         // 不创建新窗口
            CmdProcess.StartInfo.UseShellExecute = false;
            CmdProcess.StartInfo.RedirectStandardInput = true;  // 重定向输入
            CmdProcess.StartInfo.RedirectStandardOutput = true; // 重定向标准输出
            CmdProcess.StartInfo.RedirectStandardError = true;  // 重定向错误输出
            //CmdProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

            CmdProcess.OutputDataReceived += new DataReceivedEventHandler(p_OutputDataReceived);
            CmdProcess.ErrorDataReceived += new DataReceivedEventHandler(p_ErrorDataReceived);

            CmdProcess.EnableRaisingEvents = true;                      // 启用Exited事件
            CmdProcess.Exited += new EventHandler(CmdProcess_Exited);   // 注册进程结束事件

            CmdProcess.Start();
            CmdProcess.BeginOutputReadLine();
            CmdProcess.BeginErrorReadLine();

            // 如果打开注释，则以同步方式执行命令，此例子中用Exited事件异步执行。
            // CmdProcess.WaitForExit();     
        }

        private void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
        {
            if (e.Data != null)
            {
                // 4. 异步调用，需要invoke
                this.Invoke(ReadStdOutput, new object[] { e.Data });
            }
        }

        private void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)
        {
            if (e.Data != null)
            {
                this.Invoke(ReadErrOutput, new object[] { e.Data });
            }
        }

        private void ReadStdOutputAction(string result)
        {
            this.textBoxShowStdRet.AppendText(result + "\r\n");
        }

        private void ReadErrOutputAction(string result)
        {
            this.textBoxShowErrRet.AppendText(result + "\r\n");
        }

        private void CmdProcess_Exited(object sender, EventArgs e)
        {
            // 执行结束后触发
        }
    }
}