WPF dependency property precedence & reference type Default Values

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暗喜 2020-12-12 05:16

If I create a custom control like this:

public class MyControl : ContentControl
{
   public static readonly DependencyProperty ItemsProperty =


      
      
        
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                   Happy的楠姐
                                             
                
                
                (楼主)
            
              
              
                2020-12-12 05:51
              

            
            
                        
When ObservableCollection properties misbehave, I try throwing out assignments to that property. I find that the references don't translate right and bindings get lost, somehow. As a result, I avoid actually setting ObservableCollection properties (preferring, instead, to clear the existing property and add elements to it). This becomes really sloppy with a DependencyProperty because you're going to call your getter multiple times in your setter. You might want to consider using INotifyPropertyChanged instead. Anyway, here's what it'd look like:

EDIT: Blatantly stole the getter from SteveL's answer. I reworked it a touch so that you only have a single call to GetValue, is all. Good work around.

public ObservableCollection