Custom control behavior

Question

I have a custom control that has an entry among others, to this control I have put this property:

public static readonly BindableProperty EntryBehaviorsProperty = BindableProperty.Create (nameof (Behaviors), typeof (List <Behavior <Entry>>), typeof (List <Behavior <Entry>>), null, BindingMode.OneTime, propertyChanged: OnBehaviorChanged);

 private static void OnBehaviorChanged (BindableObject bindable, object oldValue, object newValue)
 {
     var view = bindable as EntryBorder;
     if (view.Behaviors! = null && view.Behaviors.Count> 0)
     {
         foreach (var item in view.Behaviors)
         {
              //x:name entry
             view.entryBorder.Behaviors.Add (item);
         }
     }
 }

 public new IList <Behavior> Behaviors
     {
         get => (IList <Behavior>) GetValue (EntryBehaviorsProperty);
         set => SetValue (EntryBehaviorsProperty, value);
     }



  <controls:EntryBorder Style="{StaticResource GeneralEntryClear}" HorizontalOptions="FillAndExpand"
                              Text="{Binding PersonCustomerRequest.PersonaCliente.Nombre}" 
                         >

            <controls:EntryBorder.Behaviors>
                <xct:EmailValidationBehavior x:Name="hola" Flags="ValidateOnUnfocusing" />
            </controls:EntryBorder.Behaviors>
        </controls:EntryBorder>

        <Label Text="Invalid email"
           TextColor="Red"
           FontSize="10"
           IsVisible="{Binding IsNotValid, Source={x:Reference hola}}" />

this doesn't work for me

Answer 1

Hi Angelru-4290,

Welcome to our Microsoft Q&A platform!

I mean you can try another alternative, which is to create a separate Property for each behavior.

public static readonly BindableProperty MaxLengthReachedBehaviorProperty = BindableProperty.Create(nameof(EntryBehavior), typeof(EntryBehavior), typeof(MaxLengthReachedBehavior), null, BindingMode.OneTime);  
  
public MaxLengthReachedBehavior EntryBehavior  
{  
    get => (MaxLengthReachedBehavior)GetValue(MaxLengthReachedBehaviorProperty);  
    set => SetValue(MaxLengthReachedBehaviorProperty, value);  
}  

add behavior,

private void AddBehavior()  
{  
    MaxLengthReachedBehavior maxBehavior = new MaxLengthReachedBehavior();  
    maxBehavior.MaxLengthReached += MaxBehavior_MaxLengthReached;  
    testEntry.MaxLength = 10;  
    testEntry.EntryBehavior = maxBehavior;  
}  
  
private void MaxBehavior_MaxLengthReached(object sender, MaxLengthReachedEventArgs e)  
{  
}  

Regards,
Kyle

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