如何调用委托线程

问题描述

大家好，

我正在尝试使用backgroundworker，我想调用一个委托让我的loadingspinner在我运行查询时运行。

如何我会这样做吗？

这是我的代码？

Hello all,
I am trying to use a backgroundworker and I want to invoke a delegate to get my loadingspinner to run while I am running a query.
How would I do this?
Here is code I have?

public LoginScreen()
        {
            InitializeComponent();
            backgroundWorker = new BackgroundWorker();
            backgroundWorker.DoWork += new DoWorkEventHandler(BackgroundWorker_DoWork);
            backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(BackgroundWorker_ProgressChanged);
            backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(BackgroundWorker_RunWorkerCompleted);
            backgroundWorker.WorkerReportsProgress = true;
            backgroundWorker.WorkerSupportsCancellation = true;
        }
        private void BtnLoginUser_Click(object sender, RoutedEventArgs e)
        {
//Not sure where I start my backgroundworker and invoke delegate
if (valid)
                {
                    // Start the background worker.
                    backgroundWorker.RunWorkerAsync();
                }
            }
        }
private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {   //Sometimes loading happens so fast so introduce 5 sec thread.sleep()
            for(int i = 1; i <= 10; i++)
            {
                System.Threading.Thread.Sleep(500);
                backgroundWorker.ReportProgress(i);
            }
        }
private void BackgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {   //Start the .Gif (Play and make visible)    free to interact with UI in progressChanged. 
            LoadSpinner.Play();
            LoadSpinner.Visibility = Visibility.Visible;
            try
            {
                loginUser = SQLuserAccess.UserLogin(username, password);
                if (loginUser != null)
                {
                    if (username == loginUser.Username && password == loginUser.Password)
                    { }
                    else
                        lblInvalidText.Visibility = Visibility.Visible;
                }
                else
                    lblInvalidText.Visibility = Visibility.Visible;
            }
            catch(Exception ex) { MessageBox.Show(ex.Message.ToString()); }
        }
private void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //Stop the loading  RUNS when thread is COMPLETED can work on UI
            BtnCreateUser.Content = "Register";
            BtnLoginUser.IsEnabled = true;
            LoadSpinner.Visibility = Visibility.Hidden;
            LoadSpinner.Stop();
            LoadSpinner.Close();
            if (loginUser != null)
            {
                if (loginUser.IsAdmin)
                {
                    Window WindowAdminMenu = new AdminWindow(loginUser);
                    WindowAdminMenu.Show();
                    Close();
                }
                else if (loginUser.IsCustomer)
                {
                    Window WindowCustomerMenu = new CustomerScreen(loginUser);
                    WindowCustomerMenu.Show();
                    Close();
                }
                else
                    lblInvalidText.Content = "Invalid Account Information";
            }
            else
                lblInvalidText.Visibility = Visibility.Visible;
        }

请帮我修改一下，使用正确的方式调用而不是使用thread.sleep（ ）



我尝试了什么：



使用backgroundworker线程但是使用thread.sleep为我的loadingspinner我想调用委托代替

Please help me change this to use this the correct way with invoking instead of me using a thread.sleep()

What I have tried:

Using a backgroundworker thread but using thread.sleep for my loadingspinner I want to invokea delegate instead like

Application.Current.Dispatcher.Invoke(delegate
    {
        backgroundWorker.ReportProgress(); //but what do i pass in and not sure if this is it
    });

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