Question

我不确定这是否是合适的地方，但这个网站在其他方面对我来说一直是一种极好的帮助。

我正在编写一个小型的个人Winforms应用程序中有一个完美的背景线程候选者，我正在寻求帮助，试图正确/正确地实现它。

这是来自表示层的调用：

    private void btnGetSeasonSchedule_Click(object sender, EventArgs e){
        Cursor.Current = Cursors.WaitCursor;
        objSchedule.RetreiveSeasonSchedule();
        MessageBox.Show("Finished");
        Cursor.Current = Cursors.Default;
    }

这是BLL中的代码：

    public class SeasonSchedule{
        public ForumAssistantDAL.SeasonSchedule objSchedule = new ForumAssistantDAL.SeasonSchedule();

        public void RetreiveSeasonSchedule(){
            DataTable dtData = GetGamesInRange(DateTime.Parse("2015-10-07"), DateTime.Parse("2016-04-30"));

            // this call is to an SQLBulkUpdate function in the DAL
            objSchedule.UploadSchedule(dtData);
        }

        // ***** BackgroundWorker Candidate #1 *****
        // my first thought is to have the entire function below as a backgroundworker process
        //as it is used in a few other locations in the application *****

        private DataTable GetGamesInRange(DateTime startDate, DateTime endDate){
            DataTable dtScheduleTable = objSchedule.CreateScheduleTable();

            // ***** BackgroundWorker Candidate #1 *****
            // instead of the entire function, just put this ForEach loop in a BackgroundWorker

            foreach (DateTime day in EachDay(DateTime.Parse(startDate.ToString("yyyy-MM-dd")), DateTime.Parse(endDate.ToString("yyyy-MM-dd")))){
                //build proper URL using URIBuilder
                //...URL requires a formatted date, hence the necessity of re-building it in a foreach loop
                var uriBuilder = new UriBuilder();
                uriBuilder.Scheme = "http";
                uriBuilder.Host = "my.datasource.address";
                uriBuilder.Path = "path_part_1/path_part_2/" + day.ToString("yyyy-MM-dd") + ".jsonp";
                var uri = uriBuilder.Uri;

                try{
                    string json = new WebClient().DownloadString(uri);

                    json = json.Replace("loadScoreboard(", "");
                    json = json.Replace(")", "");

                    GameCollection gameDay = objSchedule.ParseGames(json);

                    // ***** BackgroundWorker Candidate #2 *****
                    // each GameCollection can contain from zero to N games
                    // each game is added to a temporary DataTable
                    // when the ForEach loop is complete, the entire DataTable is returned, and the DataTable is SQLBulkCopy-ied to the database server

                    foreach (DeserializedGame game in gameDay.Games){
                        objSchedule.InsertGame(game, dtScheduleTable, day);
                    }
                }
                catch (WebException ex){
                    if (ex.Status == WebExceptionStatus.ProtocolError && ex.Response != null){
                        var resp = (HttpWebResponse)ex.Response;
                        if (resp.StatusCode == HttpStatusCode.NotFound){
                            // HTTP 404 - the page was not found, continue with next in the for loop
                            continue;
                        }
                    }
                    //throw any other exception - this should not occur
                    throw;
                }
            }

            return dtScheduleTable;
        }

        private IEnumerable<DateTime> EachDay(DateTime from, DateTime thru){
            for (var day = from.Date; day.Date <= thru.Date; day = day.AddDays(1))
                yield return day;
        }
    }

我的目标如下：

正确地多线程此应用程序
一旦多线程到位，我就实现了两个ProgressBars：
- 一个用于ForEach循环（用于跟踪每天的处理）
- ForEach循环中每个DeserializedGame一个（BackgroundWorker Candidate＃2）

我已经看过ThreadStart和ParameterizedThreadStart（我相信它是正确使用的），但是当我正确和正确地实现线程时，我觉得我非常失败。线程对我来说是一个新概念，所以任何＆＃34;对于假人而言＃34;非常感谢您提供的帮助。

后台工作人员安置

0 个答案: