BackgroundWorker 线程

最新推荐文章于 2025-03-10 21:38:00 发布

原创最新推荐文章于 2025-03-10 21:38:00 发布 · 468 阅读

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CC 4.0 BY-SA版权

文章标签：

#object #exception #button #null #class

本文介绍了一个使用线程来显示繁忙窗口的示例，通过BackgroundWorker组件实现了后台任务的执行与进度更新，展示了如何在任务完成后关闭窗口。

这是一个用线程打开繁忙窗口的例子

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

namespace WindowsApplication5.线程
{
    public partial class 线程 : Form
    {
        frmbusy frm = new frmbusy();
        public 线程()
        {
            frm = new frmbusy();

            InitializeComponent();
        }
        ///// <summary>
        ///// 全部导出操作完成后，触发此事件。
        ///// </summary>
        //public event RunWorkerCompletedEventHandler ExportingCompleted;
        //private void OnRunWorkerCompleted(object sender, DoWorkEventArgs e)
        //{
        //    frm.Close();
        //}
        ///// <summary>
        ///// 每处理完成一行，即触发此事件。
        ///// </summary>
        //public event ProgressChangedEventHandler ExportingProgressChanged;
        //private void OnExportingProgressChanged(object sender, DoWorkEventArgs e)
        //{
        //    frm.Close();
        //}

        private void button16_Click(object sender, EventArgs e)
        {
            BackgroundWorker worker = new BackgroundWorker();
            worker.WorkerReportsProgress = true;
            worker.DoWork += new DoWorkEventHandler(worker_DoWork);

            //if (ExportingProgressChanged != null)
            //{
            //    worker.ProgressChanged += new ProgressChangedEventHandler(ExportingProgressChanged);
            //}

            //if (ExportingCompleted != null)
            //{
            //    worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(ExportingCompleted);
            //}

            worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);线程执行的百分比
            worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
            worker.RunWorkerAsync();

System.Threading.Thread.Sleep(1000);

            worker.ReportProgress(100);
        }

        private void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            frm = new frmbusy();
            frm.ShowDialog ();
        }

        private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            MessageBox.Show("thead exit");
        }
        private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
            try
            {
                if (e.ProgressPercentage == 100)
                    frm.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

    }
}