CODEWITHSUNDEEP
c#winformssplash-screen
Randy
Randy

Reputation: 1287

Why does my SplashScreen Not show a Label (Text)

I have a WinForm called SpalshScreen.cs with a simple label with the Text property is set to "Data Loading...". The label is centered in the Form. I also have a public method called DoClose() method defined.

My MainForm.Form_Load method contains:

Hide();
SplashScreen form = new SplashScreen();
form.Show();

// Simulate Doing Database Table Load(s)
Thread.Sleep(5000);

form.DoClose();
Show();

However when I run, my Splash does appear but, where the Label Text is suppose to be it only shows a Light Colored Box.

If I change form.Show(); to form.ShowDialog(); the text appears correctly but the main loop pauses until I close the Splash Window.

Upvotes: 1

Views: 635

Answers (2)

Randy
Randy

Reputation: 1287

After a bunch of trial and error... The trick is to Not block the UI Thread as @Servy said.

The Form_Load method needed to change to:

Hide();
Splash.Show();

// Everything after this line must be Non UI Thread Blocking
Task task = new Task(LoadDataAsync);
task.Start();
task.Wait();

Splash.DoClose();
Show();

And I created a LoadDataAsync Method to take care of everything else: 

    private async void LoadDataAsync()
    {
        await Context.Employees.LoadAsync();
        await Context.Customers.LoadAsync();

        // The Invoke/Action Wrapper Keeps Modification of UI Elements from
        // complaining about what thread they are on.
        if (EmployeeDataGridView.InvokeRequired)
        {
            Action act = () => EmployeeBindingSource.DataSource = Context.Employees.Local.ToBindingList();
            EmployeeDataGridView.Invoke(act);
        }

        if (CustomerComboBox.InvokeRequired)
        {
            Action act = () =>
            {
                CustomerBindingSource.DataSource = GetCustomerList();
                CustomerComboBox.SelectedIndex = -1;
            };
            CustomerComboBox.Invoke(act);
        }
    }

I also set any of the private fields and private methods I was using to static.

Upvotes: 1

smohsenm
smohsenm

Reputation: 66

Use timer inside your splashscreen form instead of thread.sleep ( for example close splash screen after 5 seconds), and set closed event of it.

var form = new SplashScreen();
form.Closed += (s,e)=>{
    Show();
}
form.Show();

Upvotes: 0

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