C process runs the asynchronous echo of CMD command

The following code is new Process() call cmd command , And asynchronously echo the result to Form Example ：

using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Input;
using System.Xml;

namespace CmdCallbackShow
{
// 1. Define the entrusted
public delegate void DelReadStdOutput(string result);
public delegate void DelReadErrOutput(string result);

public partial class MainWindow : Window
{  
    // 2. Define delegate events   
    public event DelReadStdOutput ReadStdOutput;  
    public event DelReadErrOutput ReadErrOutput;  

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

    private void Init()  
    {  
        //3. Register the corresponding function in the delegate event   
        ReadStdOutput += new DelReadStdOutput(ReadStdOutputAction);  
        ReadErrOutput += new DelReadErrOutput(ReadErrOutputAction);  
    }  

    private void button1_Click(object sender, EventArgs e)  
    {  
        //  Start the process and execute the corresponding command , In this example, execute ping.exe For example   
        RealAction("ping.exe", textBox1.Text);  
    }  
    public Process CmdProcess=null;
    private void RealAction(string StartFileName, string StartFileArg)  
    {  
        CmdProcess = new Process();  
        CmdProcess.StartInfo.FileName = StartFileName;      //  command   
        CmdProcess.StartInfo.Arguments = StartFileArg;      //  Parameters   

        CmdProcess.StartInfo.CreateNoWindow = true;         //  Do not create a new window   
        CmdProcess.StartInfo.UseShellExecute = false;  
        CmdProcess.StartInfo.RedirectStandardInput = true;  //  Redirect input   
        CmdProcess.StartInfo.RedirectStandardOutput = true; //  Redirect standard output   
        CmdProcess.StartInfo.RedirectStandardError = true;  //  Redirect error output   
        //CmdProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;  

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

        CmdProcess.EnableRaisingEvents = true;                      //  Enable Exited event   
        CmdProcess.Exited += new EventHandler(CmdProcess_Exited);   //  Registration process end event   

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

        //  If you open the comment , Execute the command in a synchronous manner , Used in this example Exited Events execute asynchronously .  
        // CmdProcess.WaitForExit();       
    }  
   // 4.  Asynchronous call , need invoke 
    private void p_OutputDataReceived(object sender, DataReceivedEventArgs e)  
    {  
        if (e.Data != null)  
        {  
            // Switch between different threads   Context operations 
            Dispatcher.Invoke(ReadStdOutput, new object[] { e.Data });  // This is a wpf Need to use dispatcher, If it is winform The project is this.
        }  
    }  

    private void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)  
    {  
        if (e.Data != null)  
        {  
            Dispatcher.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)  
    {  
         if (CmdProcess != null)
                CmdProcess.Close();
    }  
}  

reference ： turn C# Process function cmd Asynchronous echo of command - ssboy - Blog Garden (cnblogs.com)