Develop Reference

Style was not found XAML

So I have my App.xaml :
<Application xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Fitness_App.App">
<Application.Resources>
<ResourceDictionary>
<Style x:Key="WorkoutStyle" TargetType="Label">
<Setter Property="FontSize" Value="28"/>
<Setter Property="FontFamily" Value="BebasNeue"/>
<Setter Property="TextColor" Value="Wheat"/>
</Style>
</ResourceDictionary>
</Application.Resources>
</Application>
Here I declared a style GLOBALLY as far as I've read the microsoft documentation.However , when in another xaml file I do this:
<Label Style= "{StaticResource WorkoutStyle}"
It says that WorkoutStyle could not be found.Any idea why?

Declaration is correct. Just Remove obj and bin of targeted project and do a rebuild.
This will solve the issue.

This is working
<Application.Resources>
<ResourceDictionary>
<Style x:Key="WorkoutStyle" TargetType="Label">
<Setter Property="FontSize" Value="28"/>
<Setter Property="TextColor" Value="Wheat"/>
</Style>
</ResourceDictionary>
</Application.Resources>
This line is not good
<Setter Property="FontFamily" Value="BebasNeue"/>
Your FontFamily is wrong look here for an example , change it with your font
<Style x:Key="NormalFont" TargetType="Label">
<Setter Property="FontFamily" Value="NunitoSans-Regular.ttf#NunitoSans-Regular.ttf"/>
</Style>
Explaned here
https://www.serkanseker.com/xamarin-forms-custom-font-family/

How to override ComboBox ToggleButton from Material Design for XAML?

I'm new in WPF.
I have an issue with overriding MaterialDesignComboBoxToggleButton
style. I wanna to replace "Template" setter with own, but my content from control template always ignores. Why this occurred? With other styles i haven't this problem.
Bellow code demonstrates what i need.
Overriedes.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.ComboBox.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style BasedOn="{StaticResource MaterialDesignComboBoxToggleButton}" TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<TextBlock FontSize="50" FontWeight="Bold">$$</TextBlock>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
App.xaml
<Application x:Class="Wpf.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-Wpf" xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
StartupUri="Views/MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<materialDesign:CustomColorTheme BaseTheme="Light" PrimaryColor="#FFD8E1FF" SecondaryColor="#FFD8E1FF" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
<ResourceDictionary Source="/Overrides.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>

Add the same resource key to your custom style like this:
<Style
x:Key="MaterialDesignComboBoxToggleButton"
BasedOn="{StaticResource MaterialDesignComboBoxToggleButton}"
TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<TextBlock FontSize="50" FontWeight="Bold">$$</TextBlock>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
and you don't need to add resources like this in Overrides.xaml file:
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.ComboBox.xaml" />
</ResourceDictionary.MergedDictionaries>
because the MDIX resources already included by MaterialDesignTheme.Defaults.xaml that you added in App.xaml file.

In my case override style in window not working ,but when I tried in App.xml then it works. I changed the style for toggle button by another style . the code is :
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Themes/IG/IG.MSControls.Core.Implicit.xaml" />
<ResourceDictionary Source="Themes/IG/IG.MSControls.Toolkit.Implicit.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Blue.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Indigo.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Border CornerRadius="8" BorderBrush="{TemplateBinding BorderBrush}"
Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center"
VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Background" Value="#FF0F0F4B" />
<Setter Property="Foreground" Value="White" />
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Background" Value="#FF73ADDE" />
<Setter Property="Foreground" Value="#FF150404" />
</Trigger>
</Style.Triggers>
</Style>
</ResourceDictionary>
</Application.Resources>

Can't use XAML ResourceDictionary in a C# / WPF class library [duplicate]

This question already has answers here:
ResourceDictionary in separate library
(3 answers)
Sharing WPF-Dictionary from another assembly
(1 answer)
Closed 3 years ago.
For a Revit plugin I'm building a WPF dialog, with a view, logic, and now some styling.
Very quickly I came to the conclusion that putting all my styling in the is really messy (it just means I'm scrolling through my XAML half of my time). So I wanted to split my styling from my XAML code (like you would with HTML and CSS).
So I found out about the and how I should go about setting it up. I have my window, with this resource code:
<Window.Resources>
<local:LocationView x:Key="mainViewDataSource" />
<FontFamily x:Key="Ubuntu">pack://application:,,,/Kalec.Enveo;component/src/Resources/Fonts/#Ubuntu</FontFamily>
<FontFamily x:Key="FontAwesomeSolid">pack://application:,,,/Kalec.Enveo;component/src/Resources/Fonts/#Font Awesome 5 Free Solid</FontFamily>
<FontFamily x:Key="FontAwesomeRegular">pack://application:,,,/Kalec.Enveo;component/src/Resources/Fonts/#Font Awesome 5 Free Regular</FontFamily>
<ResourceDictionary x:Key="dictionary" Source="pack://application:,,,/Kalec.Enveo;component/src/WPF/Styles/Dictionary.xaml" />
</Window.Resources>
And my Dictionaries:
Dictionary.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary x:Key="MergedDictionaries">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionaries/InputStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
and InputStyles.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style x:Key="SearchInputStyle" TargetType="{x:Type TextBox}">
<Setter Property="Height" Value="30"/>
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Border CornerRadius="15" Background="White" BorderBrush="Transparent" x:Name="border">
<Grid>
<TextBox Text="{Binding Path=Text,
RelativeSource={RelativeSource TemplatedParent},
Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}"
x:Name="textSource"
Background="Transparent"
Panel.ZIndex="2" />
<TextBox Text="{TemplateBinding Tag}" Background="{TemplateBinding Background}" Panel.ZIndex="1">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Setter Property="Foreground" Value="Transparent"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Text, Source={x:Reference textSource}}" Value="">
<Setter Property="Foreground" Value="Gray"/>
<Setter Property="HorizontalContentAlignment" Value="Left"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="BorderBrush" TargetName="border" Value="Red"/>
<Setter Property="Foreground" Value="Red" />
</Trigger>
<Trigger Property="IsFocused" Value="true">
<Setter Property="Foreground" Value="Blue" />
<Setter Property="BorderBrush" TargetName="border" Value="Blue"/>
</Trigger>
<DataTrigger Binding="{Binding Path=Text}" Value="">
<Setter Property="Text" Value="Vul een adres in"/>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The problem is that I can't seem to use the style on my textBox:
<StackPanel Margin="10,10,0,0" Orientation="Vertical">
<StackPanel Panel.ZIndex="10" Orientation="Horizontal"
Name="SearchParameters"
>
<TextBox Width="220" Style="{DynamicResource SearchInputStyle}"/>
<Button FontFamily="{StaticResource FontAwesomeSolid}"
Content="" Foreground="#31B192" Grid.ColumnSpan="2"
Style="{DynamicResource LocationImport}"
Margin="10, 0, 0, 0"/>
</StackPanel>
I simply get the error that it could not be resolved. I looked at some solutions, and most of them tell me to include the ResourceDictionary in my App.xaml, but I don't have that file, because my project is a class library (it's a requirement for the plugin).
Can I even use Resource Dictionaries? Or is there some other way to seperate the styling or XAML in different files?

I guess you got the correct ingredients but not the correct recipe.
Here's how its working for me:
I have a class library project which defines all my styles (ControlLibrary in the image)
Here is one Button styles ResourceDictionary
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApp1">
<Style x:Key="RedButton" TargetType="Button">
<Style.Setters>
<Setter Property="Background" Value="Red"/>
</Style.Setters>
</Style>
<Style x:Key="GreenButton" TargetType="Button">
<Style.Setters>
<Setter Property="Background" Value="Green"/>
</Style.Setters>
</Style>
</ResourceDictionary>
Then Here's is the single point of contact for all individual styles. Dictionary.xaml
(Note that this is using MergedDictionary)
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApp1">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="./Styles/ButtonStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
Finally to use the Styles from ClassLibrary dll into my WpfApp project (after adding reference to it) we again use MergedDictionaries..!!
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/ControlLibrary;component/Dictionary.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>

WPF dynamic resource not found in MergedDictionary but outside it is fine

I have a main Class (with an MainView.xaml) that dynamically loads various other Pages long after the MainView has been shown.
So MainView.xaml has following style defined:
<Window.Resources>
<Style x:Key="ErrorTemplate" TargetType="TextBox">
<Setter Property="FontSize" Value="30"/>
</Style>
</Window.Resources>
In one of the loaded pages I had following declaration:
<Page.Resources>
<Style x:Key="ErrorStyle" TargetType="TextBox">
<Setter Property="Validation.ErrorTemplate" Value="{DynamicResource ErrorTemplate"/>
</Style>
</Page.Resources>
This worked fine.
Now I needed to load other resources from an external XAML file so I used MergedDictionaries.
<Page.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<!-- Guaranteed to not have an ErrorTemplate key -->
<ResourceDictionary Source="MoreStyles.xaml"/>
<ResourceDictionary>
<Style x:Key="ErrorStyle" TargetType="TextBox">
<Setter Property="Validation.ErrorTemplate" Value="{DynamicResource ErrorTemplate"/>
</Style>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Page.Resources>
And now I started to receive the message that ErrorTemplate could not be resolved.
Moving it outside of the MergedDictionary fixed the problem again.
<Page.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="MoreStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Style x:Key="ErrorStyle" TargetType="TextBox">
<Setter Property="Validation.ErrorTemplate" Value="{DynamicResource ErrorTemplate"/>
</Style>
</ResourceDictionary>
</Page.Resources>
What is happening here?

Creating styles for a ListView in a WPF Desktop application

I have some styles for a Metro/win8 app:
<Style TargetType="ListViewItem">
<Setter Property="Background" >
<Setter.Value>
<SolidColorBrush Color="#FF171717" Opacity="0.70"/>
</Setter.Value>
</Setter>
<Setter Property="BorderBrush" Value="#FFEAF32C" />
<Setter Property="BorderThickness" Value="2, 0, 0, 0" />
<Setter Property="Padding" Value="5" />
<Setter Property="Opacity" Value="40" />
</Style>
But now I am making a desktop app in wpf (.net 4.5) and cannot apply styles like this in xaml to a ListView control. How do we define our own custom styles for a Desktop ListView control in xaml?

Here is an example putting the style in a windows resource dictionary.
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style TargetType="ListViewItem">
<Setter Property="Background" >
<Setter.Value>
<SolidColorBrush Color="#FF171717" Opacity="0.70"/>
</Setter.Value>
</Setter>
<Setter Property="BorderBrush" Value="#FFEAF32C" />
<Setter Property="BorderThickness" Value="2, 0, 0, 0" />
<Setter Property="Padding" Value="5" />
<Setter Property="Opacity" Value="40" />
</Style>
</Window.Resources>
<Grid>
<ScrollViewer HorizontalContentAlignment="Stretch" VerticalAlignment="Stretch">
<ListView>
<ListView.Items>
<Button>a</Button>
<Button>b</Button>
<Button>c</Button>
<Button>d</Button>
<Button>e</Button>
</ListView.Items>
</ListView>
</ScrollViewer>
</Grid>
</Window>
and if you want the style to be placed in it's own file then you can reference that file like this (my resource file is just call Dictionary1.xaml)
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionary1.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<Grid>
<ScrollViewer HorizontalContentAlignment="Stretch" VerticalAlignment="Stretch">
<ListView>
<ListView.Items>
<Button>a</Button>
<Button>b</Button>
<Button>c</Button>
<Button>d</Button>
<Button>e</Button>
</ListView.Items>
</ListView>
</ScrollViewer>
</Grid>
</Window>