CODEWITHSUNDEEP
c#winforms
Inside Man
Inside Man

Reputation: 4305

Load user control inside another control without UI freezing - C# Winforms

I am loading a user control inside a panel on a button click. But the UI will freeze for 3 or 4 seconds.

var uc = new TargetUserControl();
panel.Controls.Add(uc);

I can create user control in another thread.

TargetUserControl uc = null;
await Task.Run(() => { uc = new TargetUserControl(); });
panel.Controls.Add(uc);

but the main part of freezing is panel.Controls.Add(uc);.

Note that the user control does not contain any data loading etc., it's is just a bunch of UI objects, such as buttons, labels, grid with a theme design.

How to avoid it, or make the freezing time very very small?

Upvotes: -2

Views: 81

Answers (1)

Emad Kerhily
Emad Kerhily

Reputation: 280

Try to suspend layout before adding controls: In the code below I added a loading spinner to give a life to the process.

var _loader = new LoadingSpinner();  // Simple loading animation
panel.Controls.Add(_loader);

var uc = await Task.Run(() =>
    {
        var control = new TargetUserControl();
        control.CreateControl();  // Force handle creation in background
        return control;
    });
panel.SuspendLayout();
panel.Controls.Remove(_loader );
panel.Controls.Add(uc);
panel.ResumeLayout(false);  // Use false if you don't need immediate layout

Upvotes: -1

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