AppThemeBinding with StaticResource in Codebehind

Question

Hi,

How can I set the below TextColor in Codebehind?

TextColor="{AppThemeBinding Light={StaticResource FontIconLight}, Dark={StaticResource FontIconDark}}"  

Thanks,
Jassim

Answer 1

Hello,

How can I set the below TextColor in Codebehind?

You can use SetAppThemeColor to set the text color in the code behind.

For example, I have button and need to set the text color in the code behind.

• Method 1: If you put your FontIconLight Color in the current page's <ContentPage.Resources>.

  <ContentPage.Resources\>  
  <Color x:Key="FontIconLight"\>red\</Color\>  
  <Color x:Key="LightSecondaryColor"\>Black\</Color\>  
  <Color x:Key="FontIconDark"\>Teal\</Color\>  
  <Color x:Key="DarkSecondaryColor"\>White\</Color\>  
  </ContentPage.Resources\>

You can use this.Resources get the color with following code.

   MyButton.SetAppThemeColor(Button.TextColorProperty, this.Resources["FontIconLight"] as Color, this.Resources["FontIconDark"] as Color);  

• Method 2: If you put your FontIconLight Color in the Resources/Styles/Colors.xaml, you need to create a custom static dictionary to access merged dictionaries in App.xaml.cs like following code.

  public App()  
  {  
  InitializeComponent();  
  MainPage = new AppShell()  
  ResourceDictionary = new Dictionary\<string, ResourceDictionary\>();  
  foreach (var dictionary in Application.Current.Resources.MergedDictionaries)  
  {  
  string key = dictionary.Source.OriginalString.Split(';').First().Split('/').Last().Split('.').First();  
  ResourceDictionary.Add(key, dictionary);  
  }  
  }  
  public static Dictionary\<string, ResourceDictionary\> ResourceDictionary;

Then you can use App.ResourceDictionary get the color with following code.

   MyButton.SetAppThemeColor(Button.TextColorProperty, (Color)App.ResourceDictionary["Colors"]["FontIconLight"], (Color)App.ResourceDictionary["Colors"]["FontIconDark"]);  

Best Regards,

Leon Lu

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