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Included font does not load from resource dictionary in WPF

In my WPF application, I included the font that I'm using in App.xaml file as following:
<Application x:Class="STFAPP.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:STFAPP"
StartupUri="Views/LoginWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<!--Included Fonts-->
<FontFamily x:Key="TheSans">pack://application:,,,/Style/Fonts/#TheSans</FontFamily>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Style/TextBlock.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
The TextBlock.xaml is a resource dictionary that include the TextBlock style:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style TargetType="{x:Type TextBlock}" x:Key="TitleStyle">
<Setter Property="FontFamily" Value="{StaticResource TheSans}" />
<Setter Property="FontSize" Value="15" />
</Style>
I used the style in my TextBlock as following:
<TextBlock Text="Hello" Style="{StaticResource TitleStyle}"/>
The font is not loaded !?
If I avoid using separated resource dictionary (TextBlock.xaml file) and paste the style direct to App.xaml, the font will loaded successfully:
<Application x:Class="STFAPP.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:STFAPP"
StartupUri="Views/LoginWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<!--Included Fonts-->
<FontFamily x:Key="TheSans">pack://application:,,,/Style/Fonts/#TheSans</FontFamily>
<Style TargetType="{x:Type TextBlock}" x:Key="TitleStyle">
<Setter Property="FontFamily" Value="{StaticResource TheSans}" />
<Setter Property="FontSize" Value="15" />
</Style>
</ResourceDictionary>
</Application.Resources>
I want to separated the styles in multiple resources dictionary files to organize my application files.
I would be grateful for any help

Change to DynamicResource in the Style:
<Setter Property="FontFamily" Value="{DynamicResource TheSans}" />
Or move the FontFamily resource to TextBlock.xaml or another resource dictionary, like for example Fonts.xaml, and also merge this one:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Style/Fonts.xaml" />
<ResourceDictionary Source="Style/TextBlock.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>

ResourceDictionary is not used as button style

I am trying to use ResourceDictionary to set up a style for a button
<Window.Resources>
<vieModel:MainWindowViewModel x:Key="MainViewModel"/>
<ResourceDictionary x:Key="ButtonStyle"> //If I don't use key it gives error
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="GlassButton.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
and using it as
<Button Style="{DynamicResource ButtonStyle}"/>
Now, when I do this it complains that ResourceDictionary can not be applied to Style. When I use "GlassButton" as defined in GlassButton.xaml it says that GlassButton could not be resolved.
when I use it like
<Button Style="{StaticResource ButtonStyle}"/>
or use GlassButton in both cases either it complains or wont work.
GlassButton.xaml looks like this, and compiling fine
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Citations">
<Style x:Key="GlassButton" TargetType="{x:Type Button}">
<Setter Property="FontSize" Value="42" />
<Setter Property="Foreground" Value="White" />
<Setter Property="Template">
I am taking this example from here or here both are kind of using same approach of using ResourceDictionary. I am doing as shown but it still not working. Do I need a converter for this? or I am doing something wrong?

The following worked for me. Check that the path to GlassButton.xaml is correct. If you put it in a folder such as Styles you would need to use Source="Styles/GlassButton.xaml".
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="GlassButton.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<Grid>
<Button Style="{DynamicResource GlassButton}"
Content="Button Content"/>
</Grid>

I should be using it as follows
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="GlassButton.xaml"/>
</ResourceDictionary.MergedDictionaries>
<vieModel:MainWindowViewModel x:Key="MainViewModel"/>
</ResourceDictionary>
</Window.Resources>
This worked

Move the
<vieModel:MainWindowViewModel x:Key="MainViewModel"/>
line to inside of ResoruceDictonary like below:. Then you don't need to enter the key x:Key="ButtonStyle" and then style will be applied
<Window.Resources>
<ResourceDictionary >
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="GlassButton.xaml"/>
</ResourceDictionary.MergedDictionaries>
<vieModel:MainWindowViewModel x:Key="MainViewModel"/>
</ResourceDictionary>
</Window.Resources>

To call converter from ControlTemplate string

I'm trying to bind controlTemplate to in generic.xaml.My controlTemplate has converter in it.While binding,its throwing an exception as Provide value on 'System.Windows.Markup.StaticResourceHolder' threw an exception.
In MyView.cs
templateString = #"<ControlTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"" >
<Canvas><Polygon Points=""{Binding Size,Converter={StaticResource SizeConverter}}"" Fill=""red""/></Canvas>
</ControlTemplate>";
this.Template = XamlReader.Load(new System.Xml.XmlTextReader(new StringReader(templateString ))) as ControlTemplate;
In generic.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:MySample"
xmlns:vsm="clr-namespace:System.Windows;assembly=PresentationFramework"
xmlns:srcview="clr-namespace:MySample.Views"
xmlns:converters="clr-namespace:MySample.Converters"
>
<converters:SizeConverter x:Key="SizeConverter" />
<Style TargetType="{x:Type srcview:MyView}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type srcview:MyView}">
<Canvas>
<ContentControl Template="{TemplateBinding Template}" Name="contentControl" >
</ContentControl>
</Canvas>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
How to fix this issue??

One normally gets this problem when the static resources are not defined before referencing them.
For a test, try reading an xaml usercontrol with a static resource defined in the resources section of the xaml. If that works then you know the problem is not with referencing the converter, but rather when and were it is defined.
A faster way to ensure that the converter is actually being loaded is to put it in the app.xaml. This will ensure that the resource dictionary is loaded at startup. Here follows an example:
<Application x:Class="TeslaFrame.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:metro="http://schemas.codeplex.com/elysium"
>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Elysium;component/Themes/Generic.xaml"/>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="globalBoolToVisConverter" />
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>

Reference Main Window's Dictionary from Resource Dictionary

I have a WPF Window:
<Window x:Class="MyUI.MainWindow"
and so on>
<Window.Resources>
<ResourceDictionary>
<Style TargetType="{x:Type s:SurfaceListBox}" x:Key="FatherStyle" >
</ResourceDictionary>
</Window.Resources>
</Window>
I have a resource dictionary in MyResourceDictionary.xaml:
<ResourceDictionary xmlns="........."
and so on >
<Style TargetType="{x:Type s:SurfaceListBox}" x:Key="ChildStyle" BasedOn="{StaticResource FatherStyle}" />
</ResourceDictionary>
But when I try to reference ChildStyle from MyUI.Window:
<Window as shown in 1st block of code above>
<s:SurfaceListBox Style="{StaticResource ResourceKey=ChildStyle}" />
</Window>
It tells me that it can't find FatherStyle. I read here and merged the dictionary in MyResourceDictionary.xaml:
<ResourceDictionary xmlns="........."
and so on >
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="MainWindow.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style ChildStyle as shown above />
</ResourceDictionary>
Now it tells me it can't find ChildStyle. How do I reference this properly?

You can't reference a resource dictionary contained in a Window-type XAML file, from another file. What you need to do is create a separate resource dictionary, "Shared.xaml" or whatever:
<ResourceDictionary ... >
<Style TargetType="{x:Type s:SurfaceListBox}" x:Key="FatherStyle" >
</ResourceDictionary>
Now reference the shared one from your main window:
... and also from "MyResourceDictionary.xaml":
<ResourceDictionary xmlns="........."
and so on >
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Shared.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type s:SurfaceListBox}" x:Key="ChildStyle" BasedOn="{StaticResource FatherStyle}" />
</ResourceDictionary>
And now in your "MyUI.xaml" window, you should be able to access the "ChildStyle" as you expected, by referencing "MyResourceDictionary":
<ResourceDictionary xmlns="........."
and so on >
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="MyResourceDictionary.xaml" />
</ResourceDictionary.MergedDictionaries>
<s:SurfaceListBox Style="{StaticResource ResourceKey=ChildStyle}" />
</ResourceDictionary>

Silverlight. Cannot set base style from other xaml resources

I need to create resource with name OkButtonStyle based on RedButtonStyle.
But i have resource with key not found exception. What i am doing wrong?
I have two resouce dictionaries. One baseStyles.xaml where RedButtonStyle located and styles.xaml where i need to locate my okbuttonstyle but all my efforts results nothing.
App.xaml
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="baseStyles.xaml" />
<ResourceDictionary x:Name="currentTheme" Source="styles.xaml" />
</ResourceDictionary.MergedDictionaries>
styles.xaml
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="baseStyles.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style x:Key="OkButtonStyle"
BasedOn="RedButtonStyle"
TargetType="Button">
</Style>
baseStyles.xaml
<Style x:Key="RedButtonStyle"
TargetType="Button">
...properties...
</Style>

Instead of using the syntax:
<Style BasedOn="RedButtonStyle" ...
use the syntax:
<Style BasedOn="{StaticResource RedButtonStyle}" ...
The Style.BasedOn property is not the name of the other style it is based on, it is the style it is based on.