UserControl with DependencyProperty in MVVM Light

Question

I have a UserControl that add a DependencyProperty for it .

    public const string TextValuePropertyName = "TextValue";
      public string TextValue
    {
        get
        {
            return (string)GetValue(TextValueProperty);
        }
        set
        {
            SetValue(TextValueProperty, value);
        }
    }
     public static readonly DependencyProperty TextValueProperty = DependencyProperty.Register(
        TextValuePropertyName,
        typeof(string),
        typeof(FormatUserControl),
        new UIPropertyMetadata());

and use it in another Usercontrol

       <local:FormatUserControl   TextValue="{Binding Subject,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"  />

When i use this don't set value for this property when i change Subject value?

How do you know? You haven't registered a PropertyChangedCallback with the dependency property metadata. Note that WPF does usually not call the setter of the property wrapper, as explained here. — Clemens
– Clemens, Commented Sep 18, 2013 at 8:30

Chevul Ervin · Accepted Answer · 2013-09-18 09:34:12Z

1

Your FormatUserControl is the class and you should register the property for it not for the NumberFormatUserControl like this (I am not aware what is the relationship between the two user controls):

public static readonly DependencyProperty TextValueProperty = DependencyProperty.Register(
    TextValuePropertyName,
    typeof(string),
    typeof(FormatUserControl),
    new UIPropertyMetadata());

answered Sep 18, 2013 at 9:34

Chevul Ervin

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