BackgroundWorker学习笔记

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics.CodeAnalysis;

namespace BackgroundWorkerForm
{
    public struct CalcInput
    {
        public CalcInput(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
        public int x;
        public int y;
    }

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

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            CalcInput input = (CalcInput)e.Argument;
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(300);
                if (backgroundWorker1.CancellationPending)
                {
                    e.Cancel = true;
                    return;
                }
                backgroundWorker1.ReportProgress(i);
            }
           
            e.Result = input.x * input.y;
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                textBox3.Text = "Cancelled";
            }
            else
            {
                textBox3.Text = e.Result.ToString();
            }
            button1.Enabled = true;
            button2.Enabled = false;
            progressBar1.Value = 100;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            button2.Enabled = true;
            backgroundWorker1.RunWorkerAsync(new CalcInput(int.Parse(textBox1.Text),int.Parse(textBox2.Text)));
        }

        private void button2_Click(object sender, EventArgs e)
        {
            backgroundWorker1.CancelAsync();
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
        }
    }

}