I have codes to migrating to net maui I have some notifications how to set this ?

Question

public class FadeInAnimation : AnimationBase  
{  
    public enum FadeDirection  
    {  
        Up,  
        Down  
    }  

    public static readonly BindableProperty DirectionProperty =  
        BindableProperty.Create(nameof(Direction), typeof(FadeDirection), typeof(FadeInAnimation), FadeDirection.Up,  
            BindingMode.TwoWay, null);  

    public FadeDirection Direction  
    {  
        get { return (FadeDirection)GetValue(DirectionProperty); }  
        set { SetValue(DirectionProperty, value); }  
    }  

    protected override Task BeginAnimation()  
    {  
        if (Target == null)  
        {  
            throw new NullReferenceException("Null Target property.");  
        }  

        return Task.Run(() =>  
        {  
            Device.BeginInvokeOnMainThread(() =>  
            {  
                Target.Animate("FadeIn", FadeIn(), 16, Convert.ToUInt32(Duration));  
            });  
        });  
    }  

    internal Animation FadeIn()  
    {  
        var animation = new Animation();  

        animation.WithConcurrent((f) => Target.Opacity = f, 0, 1, Microsoft.Maui.Easing.CubicOut);  

        animation.WithConcurrent(  
          (f) => Target.TranslationY = f,  
          Target.TranslationY + ((Direction == FadeDirection.Up) ? 50 : -50), Target.TranslationY,  
          Microsoft.Maui.Easing.CubicOut, 0, 1);  

        return animation;  
    }  
}  

Warning CS0618 'Device.BeginInvokeOnMainThread(Action)' is obsolete: 'Use BindableObject.Dispatcher.Dispatch() instead.'

Answer 1

Hello @Sami ,

You can check the similar thread - How do you use BindableObject.Dispatcher.DispatchAsync() in .NET MAUI? - Microsoft Q&A
Microsoft.Maui.Controls.BindableObject is MAUI's root class for objects that can be bound - it is very high in the MAUI class hierarchy, and almost all MAUI objects inherit from it. See Data Binding Basic.

From the code snippets, it's not clear to me what type of your AnimationBase is, it might derive from View or Layout or other Microsoft.Maui.Controls. Since there is a bindable property, it means that the target object ( AnimationBase ) must derive from BindableObject. BindableObject have a Dispatcher property which can be used to get access to the main thread. You could try

this.Dispatcher.Dispatch(() =>  
             {  
                ...  
             })  

For more details, you can check Dispatcher.Dispatch(Action) Method (Microsoft.Maui.Dispatching) | Microsoft Learn
and BindableObject.Dispatcher Property (Microsoft.Maui.Controls) | Microsoft Learn

Best Regards,
Wenyan Zhang

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