Very simple solution for .NET 4.5.1+: <ComboBox SelectedItem=”{Binding SelectedItem, Delay=10}” ItemsSource=”{Binding Items}” /> It’s works for me in all cases. You can rollback selection in combobox, just fire NotifyPropertyChanged without value assignment.
You can use the FocusManager.FocusedElement attached property for this purpose. Here’s a piece of code that set the focus to TxtB by default. <StackPanel Orientation=”Vertical” FocusManager.FocusedElement=”{Binding ElementName=TxtB}”> <TextBox x:Name=”TxtA” Text=”A” /> <TextBox x:Name=”TxtB” Text=”B” /> </StackPanel> You can also use TxtB.Focus() in your code-behind if you don’t want to do this in XAML.
Revisiting this because I have successfully replaced our top level MFC UI (the main frame, windows, and toolbars) with WPF. As it turns out, our core drawing code merely needs to be handed an HWND to render into. This made it really easy to reuse the bulk of our existing C++ codebase. Here’s a quick … Read more
To workaround this .net bug, change all of the Solid Color Brushes in your code to be freezeable. For example <SolidColorBrush x:Key=”WindowBackground” Color=”Black” /> should be changed to: <SolidColorBrush po:Freeze=”True” x:Key=”WindowBackground” Color=”Black” />. For more detailed instructions see here: How can WPF objects deriving from Freezable be frozen in XAML?.
Instead of putting (as in your example) a button directly on the canvas, you could put a stackpanel on the canvas, horizontally aligned, and put the two buttons in there. Like so: <Canvas> <StackPanel Canvas.Left=”100″ Canvas.Top=”100″ Orientation=”Horizontal”> <Button>Button 1</Button><Button>Button 2</Button> </StackPanel> </Canvas> I think that it’s quite flexible when you use more than 1 layout … Read more
I was running into this issue as well. You need to create a new SqlDependency entity (after unsubscribing the existing one from the OnChange event) and then run a new ExecuteReader command. I got the idea from this post: http://www.codeproject.com/Articles/12335/Using-SqlDependency-for-data-change-events This usually makes sense, as once you have been notified of a change you will … Read more
This is how I filtered the items on my TreeView: I have the class: class Node { public string Name { get; set; } public List<Node> Children { get; set; } // this is the magic method! public Node Search(Func<Node, bool> predicate) { // if node is a leaf if(this.Children == null || this.Children.Count == … Read more
There is no difference in effect; in both cases the TargetType property will be set to typeof(Border) The first version {x:Type Border} was needed in the first version of WPF because the compiler did not use the TypeConverter class to convert the string into a Type object and you needed to specify the TypeExtension class … Read more
Beside the very detailed description on MSDN about the Silverlight version of INotifyDataErrorInfo There are already some blog posts with samples how to use/implement it in WPF 4.5: WPF 4.5 – Asynchronous validation (original link no longer working) Wayback Link WPF 4.5 – Part 1 : Asynchronous data validation (the author has a nice series … Read more
Here’s a version of the MessageBoxEx helper class posted in the other thread that uses WPF style message boxes (Note that you still need to reference System.Drawing): using System; using System.Text; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Interop; using System.Drawing; public class MessageBoxEx { private static IntPtr _owner; private static HookProc _hookProc; private static IntPtr _hHook; … Read more