How Can a Splash Screen Wait for a Background Thread to Finish Before Closing?

Ensuring Splash Screen Visibility Until Background Thread Completion

This article details how to create a splash screen that remains displayed until a background thread finishes processing. The splash screen, residing in a separate SplashScreen class, appears before the main application form.

The SplashScreen class incorporates a method, GetFromServer, simulating server data retrieval and processing. This method runs on a separate thread, allowing the main thread to display the splash screen concurrently. Synchronization is crucial to prevent the splash screen from closing prematurely.

To achieve this synchronization, a ManualResetEvent is utilized:

<code class="language-csharp">private ManualResetEvent _threadFinished = new ManualResetEvent(false);

private void GetFromServer()
{
    // ... (Existing GetFromServer method code) ...

    // Signal thread completion
    _threadFinished.Set();
}</code>

The DisplaySplash method in the SplashScreen class is modified to wait for the thread's completion before hiding the splash screen:

<code class="language-csharp">private void DisplaySplash()
{
    // ... (Existing DisplaySplash method code) ...

    // Wait for thread completion
    _threadFinished.WaitOne();

    // ... (Code to hide the splash screen) ...
}</code>

Finally, the Main method initiates the splash screen and uses Application.Run with ShowDialog() on the main form to block the main thread until the splash screen closes gracefully:

<code class="language-csharp">[STAThread]
static void Main()
{
    using (var splashScreen = new SplashScreen(_tempAL))
    {
        splashScreen.Show();

        Application.Run(new Form1(_tempAL));
    }
}</code>

This approach guarantees the splash screen's visibility until the background thread (GetFromServer) concludes its operations, resulting in a polished user experience.

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