每5秒执行一次按钮点击，直到后台worker停止运行并关闭

Question

我创建了一个调用 SQL table 的按钮，用户可以查看 table 的行。基本上，像

这样的查询

SELECT * FROM table1

按钮的名称为 View。

此外，我还创建了以下后台工作程序，它执行 4 分钟的长运行查询：

using System.Windows;
using System.ComponentModel;
using System.Threading;
using System;
using System.IO;
using System.Data.SqlClient;
using System.Windows.Input;

namespace TestEnvironment
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>

    public partial class ProgressBarTemplate : Window
    {
        private CreateProjectScreen _CreateProjectScreen;
        private LoginScreen _LoginScreen;

        public ProgressBarTemplate()
        {
            InitializeComponent();
        }

        public static int RunCalculationsMethod(string connectionstring, string foldername)
        {
            bool exists = Directory.Exists(foldername);

            if (!exists)
            {
                Directory.CreateDirectory(foldername);
            }

            try
            {
                using (SqlConnection sqlConnection = new SqlConnection(connectionstring))
                {
                    var calculations_query = "SELECT * FROM table1");

                    using SqlCommand sqlCommand = new SqlCommand(calculations_query, sqlConnection);

                    sqlConnection.Open();

                    sqlCommand.CommandTimeout = 60 * 10;

                    int NumbderOfRecords = sqlCommand.ExecuteNonQuery();

                    return NumbderOfRecords;
                }
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                return -100;
            }
        }

        private void Window_ContentRendered(object sender, EventArgs e)
        {
            BackgroundWorker worker = new BackgroundWorker();
            
            worker.DoWork += worker_DoWork;
            worker.RunWorkerCompleted += BackgroundWorker_RunWorkerCompleted;

            worker.RunWorkerAsync();
        }

        void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            int IsSuccessful = RunCalculationsMethod("Server=localhost;Database=DB_Name;Integrated Security=SSPI", String.Format("C:\folder_path\"));
        }

        void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            // This is called on the UI thread when the DoWork method completes
            // so it's a good place to hide busy indicators, or put clean up code

            try
            {
                this.Close();
                MessageBox.Show("DQ Calculations completed successfully", "Information", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }
    }
}

这里的琐碎情况是按钮 View 在我的 MainWindow 上，而上面的代码在名为 ExecuteBGWorker().[=25 的第二个 window 上=]

我想实现的是做一个时间触发事件，每5秒执行一次按钮View，直到后台worker停止。当工作人员停止时，按钮 View（属于 MainWindow）也将停止被自动点击。

下面是我如何从 MainWindow 中调用 ExecuteBGWorker() 方法的代码：

private void View_Click(object sender, RoutedEventArgs e)
{
    // The code to execute *View* button;
}

private void CalculationsButton_Click(object sender, RoutedEventArgs e)
{
    try
    {
        Application.Current.Dispatcher.Invoke((Action)delegate
                {
                    ExecuteBGWorker win_worker = new ExecuteBGWorker();
                    win_worker .Show();
                });
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString(), "Error", MessageBoxButton.OK, MessageBoxImage.Error);
        return;
    }
}

当我单击“查看”按钮时

5 秒后再次单击 sql table 有更多记录要显示

我显然不知道如何实现它。因此，请感谢我为 post 这个问题所做的努力。我确实搜索过这个，我发现 DispatcherTimer 定时器功能就像中那样。但是，我很长一段时间都不熟悉 C#，所以我不确定如何实现它并使计时器在 BG_Worker 完成后关闭。

Answer 1

您应该将执行查询的代码移动到 class 的方法中，并且只需使用计时器每五分钟调用一次此方法，例如：

System.Timers.Timer timer = new System.Timers.Timer();
timer.Elapsed += (s, e) =>
{
    //execute query
};
timer.Interval = 60000 * 5;
timer.Start();

每5秒执行一次按钮点击，直到后台worker停止运行并关闭

Execute button click every 5 seconds until background worker stops to operate and closes

c#

wpf

triggers

buttonclick