代码篇C#网络编程之回调

╰半夏微凉° 2022-08-05 10:24 155阅读 0赞

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    
    namespace _002_回调
    {
        public partial class Form1 : Form
        {
            //---回调一般是在线程中使用
            //--定义回调
            private delegate void SetProgressBarValueCallBack(int value);
            //--声明回调
            private SetProgressBarValueCallBack setProgressBarValueCallBack;
            public Form1()
            {
                InitializeComponent();
            }
    
            private void btn_start_Click(object sender, EventArgs e)
            {
                //--Form1.CheckForIllegalCrossThreadCalls = false;
                //--实例化委托
                setProgressBarValueCallBack = new SetProgressBarValueCallBack(SetValue);
    
                Thread setValueThread = new Thread(SetProgressBarValue);
                setValueThread.Start();
    
                for(int i =0; i <= 100; i++)
                {
                    Application.DoEvents();
                    Thread.Sleep(50);
                    pg_progressBar1.Value = i;
                }
            }
    
            //---设置进度条2的值
            private void SetProgressBarValue()
            {
                for(int i =0; i <= 100; i++)
                {
                    Thread.Sleep(50);
                    pg_progressBar2.Invoke(setProgressBarValueCallBack, i);
                    //---pg_progressBar2.Value = i;
                }
            }
    
            //--设置进度条2的委托的方法
            private void SetValue(int value)
            {
                pg_progressBar2.Value = value;
            }
        }
    }