Biegral Blog

namespace SerialPort
{
    public partial class Form3 : Form
    {
        delegate void UpdateTextEventHandler(string text);  //委托，此为重点  
        public static readonly string connStr = AppHelper.GetConfigValue("SqliteStr");
        public Form3()
        {
            InitializeComponent();
        }

        #region 窗体加载
        private void Form3_Load(object sender, EventArgs e)
        {
            serialPort1.PortName = "COM1";
            serialPort1.BaudRate = 9600;
            serialPort1.Open();
            serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
            //txtReceive.Text = "1.25";
        }
        #endregion

        #region 关闭窗体
        private void btnClose_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen) { serialPort1.Close(); }
            this.Close();
        }
        #endregion

        #region 委托侦测
        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            string SDateTemp = this.serialPort1.ReadExisting();
            if (!string.IsNullOrEmpty(SDateTemp))
            {
                SDateTemp = GetValue(SDateTemp, "GS", "kg").Trim(); //多少kg
            }
            this.Invoke(new UpdateTextEventHandler(UpdateTextBox), new string[] { SDateTemp });
        }

        private void UpdateTextBox(string text)
        {
            if (!string.IsNullOrEmpty(text))
            {
                txtReceive.Text = text;
            }
        }

        #endregion

        #region 获得字符串中开始和结束字符串之间的值
        /// <summary>
        /// 获得字符串中开始和结束字符串之间的值
        /// </summary>
        /// <param name="str">字符串</param>
        /// <param name="s">开始</param>
        /// <param name="e">结束</param>
        /// <returns></returns> 
        public static string GetValue(string str, string s, string e)
        {
            Regex rg = new Regex("(?<=(" + s + "))[.\\s\\S]*?(?=(" + e + "))", RegexOptions.Multiline | RegexOptions.Singleline);
            return rg.Match(str).Value;
        }
        #endregion

    }
}

有form1与form2两个窗体，启动form1 form1的button.click打开form2，在form2的textbox中输入文本在form1的textbox中同步显示

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 Demo0003
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 fr2 = new Form2();
            //即便你不用实时监控但你也要知道你委托给谁去办事了吧  
            //他会带来你需要的信息 然后你该干吗就干吗  
            fr2.fangfa += fuzhi;
            fr2.Show();
        }

        public void fuzhi(string str)
        {
            this.textBox1.Text = str;
        }

    }
}

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 Demo0003
{
    public delegate void delegateclass(string str);
    public partial class Form2 : Form
    {
        //哦明白了  
        public event delegateclass fangfa;

        public Form2()
        {
            InitializeComponent();
        }

        private void textBox1_KeyUp(object sender, KeyEventArgs e)
        {
            string str = this.textBox1.Text;
            Form1 f1 = new Form1();
            //我变化啦  
            fangfa(str);
            //多窗体间为多线程传递只能使用委托亲  
        }
    }
}