Use external resource : Resources « Containers « Silverlight

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Use external resource
    


<UserControl x:Class='SilverlightApplication3.MainPage'
    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' 
    mc:Ignorable='d' 
    d:DesignWidth='640
    d:DesignHeight='480'>
    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.Resources>
            <ResourceDictionary>
                <ResourceDictionary.MergedDictionaries>
                    <ResourceDictionary Source="external.xaml" />
                </ResourceDictionary.MergedDictionaries>
                <Style x:Name="Title" TargetType="TextBlock">
                    <Setter Property="FontFamily" Value="Calibri" />
                    <Setter Property="FontSize" Value="15" />
                    <Setter Property="FontWeight" Value="Bold"/>
                </Style>
                <Style x:Name="MainTitle" TargetType="TextBlock" BasedOn="{StaticResource Title}">
                    <Setter Property="Foreground" Value="Blue" />
                </Style>
                <Style x:Name="SubTitle" TargetType="TextBlock" BasedOn="{StaticResource Title}">
                    <Setter Property="FontSize" Value="12" />
                </Style>
                <Style x:Name="DynamicTitle" TargetType="TextBlock" BasedOn="{StaticResource Title}">
                    <Setter Property="FontSize" Value="20" />
                    <Setter Property="Foreground" Value="Green"/>
                </Style>
            </ResourceDictionary>
        </Grid.Resources>
        <StackPanel>
            <TextBlock Text="Title" Style="{StaticResource Title}" Margin="5"/>
            <TextBlock Text="Main Title" Style="{StaticResource MainTitle}" Margin="5"/>
            <TextBlock Text="Sub Title" Style="{StaticResource LargeTitle}" Margin="5"/>
            <Button x:Name="button1" Click="button1_Click" Content="Toggle Style" Width="150"/>
            <TextBlock x:Name="textBlock1" Text="Main Title" Style="{StaticResource MainTitle}" Margin="5"/>
        </StackPanel>
    </Grid>
</UserControl>


//File: Page.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        private bool isToggle;
        public MainPage()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            if (isToggle == false)
            {
                textBlock1.Style = LayoutRoot.Resources["DynamicTitle"as Style;
            }
            else
            {
                textBlock1.Style = LayoutRoot.
                Resources["MainTitle"as Style;
            }
            isToggle = !isToggle;
        }
    }
}

   
    
    
    
  
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