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Asked: 2026-05-19T16:18:05+00:00

I have a window set to 340 x 146 px, not resizable. In designer

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I have a window set to 340 x 146 px, not resizable.

In designer the window size is correct. But when I run the application it is bigger.
enter image description here

Edit: Also, the layout is Canvas.

Classic theme:

enter image description here

Edit2:

After running snoop (thanks Zach), it appears that actual dimensions are what I specified.
But the client area is bigger than one in visual studio.

I understand now that the client size stretches, when windows size is fixed to certain dimensions. However I think this makes Canvas layout in window unusable.

Edit3:

<Window x:Class="TI.Presentation.Views.AutentizationWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Authentication" Height="146" Width="340" ResizeMode="NoResize" Background="{StaticResource {x:Static SystemColors.ControlBrushKey}}" >
    <Canvas>
        <Label Canvas.Left="12" Canvas.Top="12" FontSize="15" Width="217">Enter authentication code here:</Label>
        <TextBox Canvas.Left="12" Canvas.Top="38" Height="23" Name="code" Width="294" FontSize="14" />
        <Button Canvas.Top="67" Content="OK" Height="28" Width="100" Canvas.Left="206" FontSize="14" IsDefault="True" Click="OKClick" />
    </Canvas>
</Window>
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1 Answer

  1. Editorial Team

    I’m going to answer this myself after poking around.

    The window’s ActualWith and ActualHeight are equal to Width and Height set in the designer.

    What changes, is the client area. The dimensions of client are will be window dimensions minus theme border. This, however, breaks Canvas design because its absolutely positioned and canvas dimensions changed based on theme.

    The way to make Canvas design work. Is to set dimensions on Canvas, remove dimensions on window and set SizeToContent on window accordingly. This way, cavnas dimensions stay fixed and Window size changes based on how think the theme border is.

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