Question

这是一个非常接近我的问题（我认为）：Running a method in BackGroundWorker and Showing ProgressBar

这是我的代码，它不再冻结我的主表单，但功能不起作用。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using YoutubeSearch;


namespace searchyoutubeTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            myBGWorker.WorkerReportsProgress = true;
        }

        void myBGWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            myProgressBar.Value = e.ProgressPercentage;
        }

        void myBGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            btnSearch.Enabled = true;
            MessageBox.Show("Done");


        }


        private void myBGWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            VideoSearch items = new VideoSearch();
            List<Video> list = new List<Video>();
            foreach (var item in items.SearchQuery(txtSearch.Text, 1))
            {
                Video video = new Video();
                video.Title = item.Title;
                video.Author = item.Author;
                video.Url = item.Url;
                byte[] imageBytes = new WebClient().DownloadData(item.Thumbnail);
                using (MemoryStream ms = new MemoryStream(imageBytes))
                {
                    video.Thumbnail = Image.FromStream(ms);
                }

                list.Add(video);

            }
            e.Result = list;
        }


        private void btnSearch_Click(object sender, EventArgs e)
        {
            btnSearch.Enabled = false;
            myBGWorker.RunWorkerAsync();

            //VideoSearch items = new VideoSearch();
            //List<Video> list = new List<Video>();
            //foreach (var item in items.SearchQuery(txtSearch.Text, 1))
            //{
            //    Video video = new Video();
            //    video.Title = item.Title;
            //    video.Author = item.Author;
            //    video.Url = item.Url;
            //    byte[] imageBytes = new WebClient().DownloadData(item.Thumbnail);
            //    using (MemoryStream ms = new MemoryStream(imageBytes))
            //    {
            //        video.Thumbnail = Image.FromStream(ms);
            //    }

            //    list.Add(video);

            //}
            //videoBindingSource.DataSource = list;
        }

        private void txtSearch_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                btnSearch_Click(this, new EventArgs());
            }
        }


    }
}

但如果我只做这个功能，那就有效：

 //VideoSearch items = new VideoSearch();
        //List<Video> list = new List<Video>();
        //foreach (var item in items.SearchQuery(txtSearch.Text, 1))
        //{
        //    Video video = new Video();
        //    video.Title = item.Title;
        //    video.Author = item.Author;
        //    video.Url = item.Url;
        //    byte[] imageBytes = new WebClient().DownloadData(item.Thumbnail);
        //    using (MemoryStream ms = new MemoryStream(imageBytes))
        //    {
        //        video.Thumbnail = Image.FromStream(ms);
        //    }

        //    list.Add(video);

        //}
        //videoBindingSource.DataSource = list;

知道我做错了吗？

Answer 1

我假设您正确添加了按钮和表格上传的事件你没有附上BackgroundWorker的事件。当您单击搜索按钮时，工作程序将启动，并在单独的线程上调用DoWork方法。

public Form1()
{
    InitializeComponent();

    myBGWorker.WorkerReportsProgress = true;
    myBGWorker.DoWork += myBGWorker_DoWork;
    myBGWorker.ProgressChanged += myBGWorker_ProgressChanged;
    myBGWorker.RunWorkerCompleted += myBGWorker_RunWorkerCompleted;
}

YoutubeSearch Nuget in a bgworker and progressbar not working

1 个答案: