How to add additional styles to a window which is already using a style template

Question

How to add additional styles to window style when it already using a style like in below?

    <Style x:Key="MyWindowStyle" TargetType="Window">
        <Setter Property="Control.Background" Value="PaleGreen"/>
        <Setter Property="Window.Title" Value="Styled Window"/>
    </Style>

My main window is:

<Window x:Class="Binding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Binding"
        mc:Ignorable="d"
        Style="{StaticResource MyWindowStyle}"
        Title="MainWindow" Height="450" Width="800">   
    <StackPanel>
        <Label  Content="Test Window" />
    </StackPanel>
</Window>

So I want to use MyWindowStyle but say I also want to add additional styles like adding the following:

        <Setter Property="BorderThickness" Value="3"/>
        <Setter Property="BorderBrush" Value="Red"/>

How do I do that? I can't figure out the syntax.

Nawed Nabi Zada · Accepted Answer · 2020-06-02T14:04:22.493

Problem is that when you use StaticResouce the resource has to be initialized before the usage.

In your case you have the resource inside the window therefor it is not initialized before the window is initialized.

Use DynamicResource instead and it will work:

<Window x:Class="Binding.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:Binding"
    mc:Ignorable="d"
    Style="{DynamicResource MyWindowStyle}"
    Title="MainWindow" Height="450" Width="800">   


<Window.Resources>
    <Style x:Key="MyWindowStyle" TargetType="{x:Type Window}">
        <Setter Property="Control.Background" Value="PaleGreen"/>
        <Setter Property="Window.Title" Value="Styled Window"/>
        <Setter Property="BorderThickness" Value="3"/>
        <Setter Property="BorderBrush" Value="Red"/>
    </Style>
</Window.Resources>

   <StackPanel>
      <Label  Content="Test Window" />
   </StackPanel>
</Window>

See more here about WPF Resources.

score 0 · Answer 2 · answered Jun 02 '20 at 02:28

0

You can define MyWindowStyle2 and use it.

<Style x:Key="MyWindowStyle2" TargetType="Window" BasedOn="{StaticResource MyWindowStyle}">
    <Setter Property="BorderThickness" Value="3"/>
    <Setter Property="BorderBrush" Value="Red"/>
</Style>

Or here

answered Jun 02 '20 at 02:28

Michael Kim

343
5
20

Thanks but I want to add styles locally and this doesn't work if I add this style to the same Window's resources (it's not available in same window). However it works if I add it to application's resources. I want to add style locally. Do you know if that's possible? Thanks – zar Jun 02 '20 at 02:50

How to add additional styles to a window which is already using a style template

2 Answers2