Releasing the Image File Locked by BitmapImage in WPF with BitmapCacheOption.OnLoad
An image file shown through BitmapImage cannot be deleted or overwritten. This covers the default caching behavior behind it and the OnLoad fix.
WPF
Articles on WPF and XAML — data binding, controls, styling, virtualization, and UI behavior. Each one starts from a concrete problem met while building a Windows desktop application, explains why the behavior occurs, and works through the implementation and its trade-offs.
WPF articles (21)
All articles →Fixing a RelayCommand Whose CanExecute Does Not Update the Button State in WPF
A custom RelayCommand's button stays stuck when CanExecuteChanged is never raised. This compares delegating to RequerySuggested with raising it manually.
Calling TextBox UpdateSource from the View in WPF: Implementation and Pitfalls
Calling GetBindingExpression().UpdateSource() from the View has pitfalls: null returns, bulk updates, wrong direction, and MVVM, grounded in official docs.
Controlling When TextBox Input Reaches the Source with UpdateSourceTrigger in WPF
TextBox.Text defaults to LostFocus, so typed input may never reach the ViewModel. This covers the three UpdateSourceTrigger values, their timing, and pitfalls.
Fixing the Cross-Thread Exception When Updating an ObservableCollection in WPF
Modifying a bound ObservableCollection off the UI thread throws a NotSupportedException from CollectionView affinity. This covers the cause and two fixes.
Hiding the Clear Button on a Fluent-Themed WPF TextBox
How to hide the clear button a Fluent-themed WPF TextBox shows on focus, without changing input behavior, on .NET 10 and .NET 9.
Why a WPF ScrollViewer Does Not Scroll and How to Fix It
A ScrollViewer inside a StackPanel does not scroll because the StackPanel never constrains its height. This covers the cause and the Grid and DockPanel fixes.
Formatting Numbers, Currency, and Dates with Binding.StringFormat in WPF
A practical guide to formatting numbers, currency, and dates with Binding.StringFormat without a converter, including culture and ContentControl constraints.
Reading WPF Binding Errors and Diagnosing Them with the Output Window
When a WPF Binding fails silently, Visual Studio logs it as a trace. This article covers reading the message, raising the trace level, and common patterns.
How to Reset DataGrid Sorting in WPF
Practical ways to reset WPF DataGrid sorting, including explicit clearing, Sorting-event control, CollectionView handling, and a reusable Behavior.
Why StaticResource Changes Are Not Reflected in WPF and How to Fix It
StaticResource resolves its value at XAML load time, so runtime changes have no effect. Use DynamicResource when the value must update at runtime.
Why WPF Slows Down with Many Labels and When to Switch to TextBlock
This article explains why rendering slows down when many WPF Labels are used and provides practical criteria for replacing them with TextBlock.
Why WPF Label Hides Underscores and How to Fix It
When a string containing an underscore (_) is set on a WPF Label, the character disappears from the screen. This article explains the cause and three ways to...
Switching Controls Between Display and Edit Modes in WPF DataGrid Cells
Use DataGridTemplateColumn with CellTemplate and CellEditingTemplate to separate display UI from editing UI in WPF DataGrid.
Fixing a WPF Tray ContextMenu That Does Not Close on Focus Loss
This article explains how TreePaste resolved a tray ContextMenu that stayed visible until an item was clicked by combining StaysOpen=false with SetForeground...
Applying Fluent Design in WPF Without Extra Libraries
This article explains how to apply Fluent styling in WPF using only built-in features, with App.xaml theme setup and SystemColors-based color tracking.
How to Display Selectable, Copyable Read-Only Text in WPF
Learn how to use a read-only TextBox as a TextBlock replacement in WPF so text remains selectable and copyable without allowing edits.
WPF ComboBox ItemsSource Binding Patterns and Selected Value Retrieval
The correct combination of DisplayMemberPath, SelectedItem, SelectedValue, and SelectedValuePath depends on the element type bound to ItemsSource. This artic...
How to Prevent SelectedItems from Appearing Lost in a Virtualized WPF ListBox
Why ListBox selection appears to vanish under UI virtualization, and how an IsSelected-based MVVM pattern keeps it stable, including Shift-range selection.
How to Implement DataGrid Sorting in WPF
Learn the basics of DataGrid sorting and practical implementation patterns for real-world WPF applications.
Customising the DatePicker Display Format in WPF
A practical guide to changing the date display format of WPF DatePicker from XAML, code-behind, and a value converter.