CODEWITHSUNDEEP
c#wpfxamlstyling
Zeb-ur-Rehman
Zeb-ur-Rehman

Reputation: 1209

Set Font Size Dynamically in WPF

I'm trying to set font size dynamically in WPF. Here what i did so far.

App.xaml

<Style TargetType="{x:Type FrameworkElement}" x:key="baseStyle"></Style>
<Style TargetType="{x:Type TextBlock}" BasedOn={StaticResource baseStyle}"/>

App.xaml.cs

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
         base.OnStartup(e);
         double fontSize = System.Drawing.SystemFonts.IconTitleFont.Size;
         Style style = new Style{ TargetType = typeof(FrameworkElement)};
         style.Setter.Add(new Setter(TextElement.FontSizeProperty, fontSize));
       Application.Current.Resources["baseStyle"] = style;  

    }
}

MainWindow.xaml

<TextBlock Text="This is Sparta!!!"/>

Issue:

When the OnStartup called the resource 'baseStyle' is not available. So the style is assigned to Null value due to which the style is not applied. Anyone having idea to implement it in some other way. Your help will be appreciated.

Edit: There is one thing that i would like to clarify. In reality i have wrote that App.xaml and App.xaml.cs code in resource dictionary and merged it in App.xaml. The code written in OnStartup is written in constructor of that code behind class.

Upvotes: 0

Views: 4467

Answers (1)

user5747953
user5747953

Reputation:

With a little modification your code works. Just remove and add the base style

Style style = new Style { TargetType = typeof(FrameworkElement) };
            style.Setters.Add(new Setter(TextElement.FontSizeProperty, fontSize));
            Application.Current.Resources.Remove("baseStyle");
            Application.Current.Resources.Add("baseStyle" , style);

Upvotes: 1

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