C# uses named pipe Pipe for process communication example

1. New solution NamedPipeExample

1. Create two new projects: Client and Server, both output types are "Windows Application". The structure of the entire program is shown in the figure below.
   
   This Form1 is the form of Client, as shown in the figure below.
   
   The back-end code is as follows.

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

using System.IO;
using System.IO.Pipes;
using System.Security.Principal;

namespace Client
{
    
    
    public partial class Form1 : Form
    {
    
    
        NamedPipeClientStream pipeClient =
            new NamedPipeClientStream("localhost", "testpipe", PipeDirection.InOut, PipeOptions.Asynchronous, TokenImpersonationLevel.None);
        StreamWriter sw = null;
        public Form1()
        {
    
    
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
    
    
            try
            {
    
    
                pipeClient.Connect(5000);
                sw = new StreamWriter(pipeClient);
                sw.AutoFlush = true;
            }
            catch (Exception ex)
            {
    
    
                MessageBox.Show("连接建立失败，请确保服务端程序已经被打开。");
                this.Close();
            }
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
    
    
            if (sw != null)
            {
    
    
                sw.WriteLine(this.txtMessage.Text);
            }
            else
            {
    
    
                MessageBox.Show("未建立连接，不能发送消息。");
            }
        }
    }
}

This Form1 is the server form, as shown in the following figure, the

back-end code is as follows.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Server
{
    
    
    public partial class Form1 : Form
    {
    
    
        NamedPipeServerStream pipeServer =
            new NamedPipeServerStream("testpipe", PipeDirection.InOut, 1, PipeTransmissionMode.Message, PipeOptions.Asynchronous);
        public Form1()
        {
    
    
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
    
    

        }

        private void Form1_Load(object sender, EventArgs e)
        {
    
    
            ThreadPool.QueueUserWorkItem(delegate
            {
    
    
                pipeServer.BeginWaitForConnection((o) =>
                {
    
    
                    NamedPipeServerStream pServer = (NamedPipeServerStream)o.AsyncState;
                    pServer.EndWaitForConnection(o);
                    StreamReader sr = new StreamReader(pServer);
                    while (true)
                    {
    
    
                        this.Invoke((MethodInvoker)delegate {
    
     lsvMessage.Text = sr.ReadLine(); });

                    }
                }, pipeServer);
            });
        }

        private void maskedTextBox1_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
        {
    
    

        }
    }
}

Run Server first and then Client