c# - ReportProgress 是否必须在c# 的DoWork Ba​​ckground 方法中完成？

Question

我有一个应用程序可以收集视频列表中的数据。我希望实时更新进度和文件名。我是否必须将检查这些文件的所有代码都放在 bw_DoWork 方法中？

目前我有这个方法，但是 bw.ReportProgress 不能正常工作。

private void GetMovieData(List<FileInfo> completeMovieList)
    {
        List<string> movieLists = new List<string>();

        int counter = 0;
        foreach (FileInfo movie in completeMovieList)
        {
            counter++;
            string[] movieData = new string[3];

            bw.ReportProgress(counter / completeMovieList.Count);


            // get last modified date
            string movieLastModified = string.Concat(movie.LastWriteTime.Year + "/" + movie.LastWriteTime.Month + "/" + movie.LastWriteTime.Day);

            // get duation of video
            string lengthOfVideo = Program.GetDetails(movie);

            if (!movieListWithData.ContainsKey(movie.Name))
            {
                movieData[0] = lengthOfVideo;
                movieData[1] = movieLastModified;
                movieData[2] = movie.FullName;
                movieListWithData.Add(movie.Name, movieData);

            }

            movieLists.Add(movie.FullName + "|" + lengthOfVideo + "|" + movieLastModified);

        }

        StringBuilder sb = new StringBuilder();

        foreach (KeyValuePair<string, string[]> key in movieListWithData)
        {
            sb.AppendLine(key.Key + "|" + key.Value[0] + "|" + key.Value[1] + "|" + key.Value[2]);
        }

        File.WriteAllText(Program.movieTxtFileLocalPath, sb.ToString());
    }

我的 DoWork 方法如下所示:

private void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;

            if ((worker.CancellationPending == true))
            {
                e.Cancel = true;

            }

Answer 1

Do I have to place all the code that examines those files in the bw_DoWork method?

不，代码不必实际存在，但您必须从 DoWork 中调用代码。目前您的 DoWork 方法没有做任何事情。

还记得设置属性 WorkerReportsProgress在您的 BackgroundWorker 上设置为 true。您可以在设计器中执行此操作。