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How can I center an element in wpf canvas using attached properties?
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Canvas In WPF. The default values of Height and Width properties of a Canvas are 0. If you do not set these values, you will not see a canvas unless child elements are automatically resizable. Child elements on a Canvas are never resized. The vertical and horizontal alignments on child elements do not work.
The Canvas element in XAML represents a Canvas control. The Canvas control has three properties. The Left property represents the distance between the left side of a control and its parent container Canvas. The Top property represents the distance between the top of a control and its parent container Canvas.
The Canvas class in WPF represents a Canvas control. The code listed in Listing creates a Canvas Panel dynamically, add three Rectangle controls to it, and sets their left and top positions using Canvas.SetLeft and Canvas.SetTop methods. The output of Listing generates Figure 1. private void CreateDynamicCanvasPanel () {
The Top property represents the distance between the top of a control and its parent container Canvas. The code in Listing 1 creates a Canvas and adds three Rectangle controls and position them using Canvas control properties. The output looks like Figure 1. The Canvas class in WPF represents a Canvas control.
I came across this post, because I was searching for a way to center an element within a Canvas in XAML only, instead of using Attached Properties.
Just in case, you came for the same reason:
<Canvas x:Name="myCanvas"> <Grid Width="{Binding ActualWidth, ElementName=myCanvas}" Height="{Binding ActualHeight, ElementName=myCanvas}"> <Label Content="Hello World!" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> </Canvas> Beware that every solution here is a trap, depending on what you try to archive. Just because your element is within the Canvas on a hierarchical order, it will not be part of the Canvas itself. A Canvas is something to draw on and not to place controls in. So you cannot use the Canvas API for those controls, because the Grid is like an isolated overlay, obviously.
If you want a separated overlay, whilst the Canvas is your background, you are good to go with this solution.
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