Access Color inside Resources' Colors

Question

Hi,

I am trying to access a Color inside the Resources->Colors.xaml but getting this error:

System.Collections.Generic.KeyNotFoundException: The resource 'ConnectedIconLight' is not present in the dictionary.
  at at Microsoft.Maui.Controls.ResourceDictionary.get_Item(String index)
  at DataEye.MainPage.CheckConnection() in /Users/jassim/Projects/DataEye/DataEye/MainPage.xaml.cs:133
  at DataEye.MainPage.<.ctor>b__10_0(Object s, EventArgs e) in /Users/jassim/Projects/DataEye/DataEye/MainPage.xaml.cs:28
  at at Microsoft.Maui.Dispatching.DispatcherTimer.OnTimerTick()
  at at ObjCRuntime.BlockStaticDispatchClass.TrampolineDispatchBlock(IntPtr block)
  at at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName)
  at at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass)
  at DataEye.Program.Main(String[] args) in /Users/jassim/Projects/DataEye/DataEye/Platforms/iOS/Program.cs:13

Here is my code:

LabelStatus.SetAppThemeColor(Label.TextColorProperty, App.Current.Resources["ConnectedIconLight"] as Color, Application.Current.Resources["ConnectedIconDark"] as Color);

and this the Color:

<Color x:Key="ConnectedIconLight">#000000</Color>

Kindly help..

Thanks,

Jassim

Answer 1

Hello,

You can refer to the following code to access the Color you defined inside the Resources->Colors.xaml

            ResourceDictionary ColorResource = Application.Current.Resources.MergedDictionaries.FirstOrDefault() as ResourceDictionary;
            Color lightcolor = ColorResource["ConnectedIconLight"] as Color;
        Color darkcolor = ColorResource["ConnectedIconDark"] as Color;
        LabelStatus.SetAppThemeColor(Label.TextColorProperty, lightcolor, darkcolor);

It's recommended that you use the StaticResource markup extension if you don't need to change the app theme at runtime.

For more details, you can refer to
Theme an app - .NET MAUI | Microsoft Learn
Resource dictionaries - .NET MAUI | Microsoft Learn
Consume XAML markup extensions - .NET MAUI | Microsoft Learn

Best Regards,

Wenyan Zhang

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