C#•7mo ago

✅ Winforms redraw question

To start: I am still a very early beginner in c# and winforms, so sorry if im asking something obvious. I am trying to make a personal desktop application for displaying games from a database. At first I had displayed the data in a datagridview but after getting a bit better at c# I was trying to add panels to a panel that had a picture and some text (see picture1 (ignore the text, I was still testing stuff)). Now I finally got the panels to be added programmatically, but now whenever I scroll through the panel that has autoScroll on the dynamically added panels with the game pictures get redrawn or reloaded (see picture2). Now what I was wondering is why this happens? I assume it has something to do with the fact that there are so many images (the panels themselves all have background images, the tag labels (the yellow and gray pieces) also are images) Below is the method I made to draw the panels https://pastebin.com/rZy6QNtP If any more info is needed to help, please let me know

Pastebin

drawGamePanel - Pastebin.com

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

10 Replies

SpReeD•7mo ago

Since nobody answered, I'm gonna give it a try. First things first, WinForms isn't made for such fancy things, it uses GDI+ engine to draw the Windows. Which is fine as long as you don't do something extraordinary with animations, pictures and a lot of Controls. DoubleBuffer helps, but isn't the solution to everything. However, WinForms has it's limits. I would advice you to use WPF or Avalonia (Cross-Platform). Unlike WinForms, WPF doesn't use GDI+, but is built upon DirectX, so it's able to use your graphic card for rendering; GDI/GDI+ uses the CPU only. That opens a whole new world of fancy UI stuff like you obviously wanna do. Besides what I wrote; your cards should be a seperate UserControl with it's respective properties, like image, hours played, achievements, name, etc.

Omnissiah•7mo ago

still, that artifacts shouldn't happen

SirDurpsalotOP•7mo ago

I had a feeling I was pushing the limits. Guess its time to learn WPF. Thanks for the info. Guess ill have to start from scratch Oh yeah that would have been smart

SpReeD•7mo ago

$wpf

MODiX•7mo ago

WPF is the DirectX and XAML powered, Windows-only desktop GUI framework. You should prefer to use this over Windows Forms where you can. Hello World in WPF: https://docs.microsoft.com/en-us/visualstudio/get-started/csharp/tutorial-wpf

SirDurpsalotOP•7mo ago

Anyone got any recommendations for good tutorials for total beginners? 😅

leowest•7mo ago

for WPF? https://wpf-tutorial.com/ also with WPF u do not ever drag and drop controls like in winforms $rulesofwpf

MODiX•7mo ago

Rules of WPF:

❌ Avoid the WPF Designer to eliminate a category of confusing bugs
❌ Don't rely on Margin as the primary tool for layouts
❌ Avoid writing UserControls or subclassing to extend a default control -- use Behaviors instead (Microsoft.Xaml.Behaviors.Wpf)

✅ Write XAML by hand and autoformat with "Ctrl K,D" or XAML Styler
✅ Rely upon XAML Hot Reload to design your app's UI at runtime
✅ Use layout controls (Grid, DockPanel, etc) to support proper resizing
✅ Use data binding to eliminate glue code and state synchronization issues
✅ Use collection controls and DataTemplate to dynamically create lists of controls
✅ Learn MVVM to create maintainable apps
✅ Use the Dispatcher to update controls from non-UI threads
✅ WPF's default controls can be easily modernized via $wpfuilibs
✅ Include relevant XAML, code-behind, and ViewModel code for questions when possible

Rules of WPF:

❌ Avoid the WPF Designer to eliminate a category of confusing bugs
❌ Don't rely on Margin as the primary tool for layouts
❌ Avoid writing UserControls or subclassing to extend a default control -- use Behaviors instead (Microsoft.Xaml.Behaviors.Wpf)

✅ Write XAML by hand and autoformat with "Ctrl K,D" or XAML Styler
✅ Rely upon XAML Hot Reload to design your app's UI at runtime
✅ Use layout controls (Grid, DockPanel, etc) to support proper resizing
✅ Use data binding to eliminate glue code and state synchronization issues
✅ Use collection controls and DataTemplate to dynamically create lists of controls
✅ Learn MVVM to create maintainable apps
✅ Use the Dispatcher to update controls from non-UI threads
✅ WPF's default controls can be easily modernized via $wpfuilibs
✅ Include relevant XAML, code-behind, and ViewModel code for questions when possible

SirDurpsalotOP•7mo ago

Thanks a ton, excited to start learning WPF Thank to everyone who responded :yotsubless:

MODiX•7mo ago

If you have no further questions, please use /close to mark the forum thread as answered

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✅ Winforms redraw question