本实例演示定义委托，并利用委托把来自串口接收到的数据显示在文本框中！熟悉委托的定义和串行数据收发的简单功能！

项目代码：

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; namespace WindowsFormsApplication1 { /// 
 /// QQ 458978 无名 c#开发技术 欢迎和我交流探讨 /// 
 public partial class Form1 : Form { /// 
 /// 定义委托 /// 
 ///public delegate void ShowString(string a); /// 
 /// 字符显示在文本框 /// 
 ///public void ShowTxt(string a) { this.textBox1.AppendText(DateTime.Now.ToString() + | + a + ); if (textBox1.TextLength > 2000) { textBox1.Clear(); } } /// 
 /// 定义委托并初始化 /// 
 ShowString AA; /// 
 /// 接收字符串存储 /// 
 string ReadStr = ; public Form1() { InitializeComponent(); serialPort1.Open(); AA = new ShowString(ShowTxt);//初始化委托 } //串口收到数据并回发 private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { ReadStr = serialPort1.ReadExisting(); byte[] ReadBuffer; ReadBuffer= System.Text.ASCIIEncoding.ASCII.GetBytes(ReadStr); this.Invoke(AA, ReadStr); serialPort1.Write(ReadBuffer, 0, ReadBuffer.Length); } } } 

运行效果图片：