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>

Finding resources in wpf with several levels

I have a problem when I have several levels or resources in wpf
for instance if i have this code
main.xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<Style TargetType="{x:Type TextBox}" x:Key="Main">
<Setter Property="FontSize" Value="50"/>
</Style>
</ResourceDictionary>
sub.xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<Style TargetType="{x:Type TextBox}" x:Key="Sub" BasedOn="{StaticResource Main}">
<Setter Property="BorderBrush" Value="Red"/>
<Setter Property="BorderThickness" Value="20"/>
</Style>
</ResourceDictionary>
all.xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:p19"
>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Main.xaml"/>
<ResourceDictionary Source="Sub.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
app.xaml
<Application.Resources>
<ResourceDictionary Source="All.xaml"/>
</Application.Resources>
in mainwindow i just have
<Grid>
<TextBox Style="{StaticResource Sub}"/>
</Grid>
This won't work.
However if I put resources directly into app.xaml (and not through all.xaml) like this
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Main.xaml"/>
<ResourceDictionary Source="Sub.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
It does work. I think i remember that someone said somewhere (I can't remember where) that this is a bug in wpf and can be solved with some empty styles and with new .net framework.
I tried 2015 rc and 4.6 and it still doesn't work.
Does someone know how to fix it and where? And can they try out the code on their side to see if it works?
Thanks in advance for your help

The trick is to put this dictionary in turn into a merged dictionary:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="All.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
Should work fine then.
Edit
However you get into trouble when you try to access a style from another dictionary. To get rid of this reference it in the sub.xaml too:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Main.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type TextBox}" x:Key="Sub" BasedOn="{StaticResource Main}">
<Setter Property="BorderBrush" Value="Red"/>
<Setter Property="BorderThickness" Value="20"/>
</Style>
</ResourceDictionary>

CalendarStyle of DatePicker different than my custom CalendarStyle

I have a custom Calendar style and a custom DatePicker style.
Code in my MyCustomSkin.xaml (from my library project)
<Style TargetType="{x:Type Calendar}">
<Setter Property="Background" Value="Red"/>
</Style>
<Style TargetType="{x:Type DatePicker}">
<Setter Property="Background" Value="Green"/>
</Style>
They are both inside my MyCustomSkin.xaml ResourceDictionary (separate solution that generate a MyCustomSkin.dll) that I reference inside my application.
Code in my App.xaml (from my application)
<Application x:Class="WpfApplication1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MyCustomSkin;component/MyCustomSkin.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Code in my MainWindow.xaml (from my application)
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow">
<Grid>
<DatePicker HorizontalAlignment="Right" />
<Calendar HorizontalAlignment="Left"/>
</Grid>
</Window>
When I create a Calendar in my application (without specifying any style), the background is red.
When I am creating a DatePicker in my application (without specifying any style), the background is green but the background of its calendar is the system one (=> not red).
Why? I thougt that I was overriding all the system calendars with mine. Why is it applying the custom style for the Calendar but not on the Calendar of DatePicker?
Thank you!

Your MyCustomSkin.xaml should be:
<Style TargetType="{x:Type Calendar}" >
<Setter Property="Background" Value="Red" />
</Style>
<Style TargetType="{x:Type DatePicker}" >
<Setter Property="Background" Value="Green" />
<Setter Property="CalendarStyle">
<Setter.Value>
<Style TargetType="{x:Type Calendar}" BasedOn="{StaticResource {x:Type Calendar}}"/>
</Setter.Value>
</Setter>
</Style>
DatePicker has a default CalendarStyle which will be applied on component initialization.

how to load custom staticresource

I have to 2 files:
ButtonStyle.xaml and
ConstantsStyle.xaml
in App.xaml, i will init
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Zalo;component/ResourceDictionary/480x800/ConstantsStyle.xaml"/>
<ResourceDictionary Source="/Zalo;component/ResourceDictionary/480x800/ButtonStyle.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
......
</Application.Resources>
file ConstantsStyle.xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows">
<Thickness x:Key="GenericButtonStylePadding">0,7</Thickness>
</ResourceDictionary>
file ButtonStyle.xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
xmlns:usercontrols="clr-namespace:Zalo.UserControls">
<Style x:Key="GenericButtonStyle" TargetType="Button">
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="Padding" Value="{StaticResource GenericButtonStylePadding}"/>
</Style>
</ResourceDictionary>
App crash runtime. Because Cannot find a Resource with the Name/Key GenericButtonStylePadding???
How can i run app correctly??? Please help me

Try using DyanamicResource instead of StaticResource
<Style x:Key="GenericButtonStyle" TargetType="Button">
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="Padding" Value="{DynamicResource GenericButtonStylePadding}"/>
</Style>
Edit:
You can test one thing. Add another constant to Constant.XAML
<Brush x:Key="BGBrush">Black</Brush>
Try to use it in your ButtonStyle.XAML
<Style x:Key="GenericButtonStyle" TargetType="Button">
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="Width" Value="200"></Setter>
<Setter Property="Background" Value="{StaticResource BGBrush}"></Setter>
</Style>
See if button background changes to Black.
If color is changing then try something else than Thickness.