边框背景绑定只工作一次

Question

I have a border with background binded to the color property in my ViewModel. But background change color only once after initialization. At the same time, I have 3 textboxes binded to the same property(R, G and B) and they works fine.

Why is textboxes works fine and border not? Here is border's code:

<Border x:Name="bNewColor" BorderBrush="Black" >
    <Border.Background>
        <SolidColorBrush Color="{Binding NewColor}"/>
    </Border.Background>    
</Border>

Textboxes:

<Ellipse x:Name="eMarker" Margin="{Binding MarkerMargin, Mode=TwoWay}" Width="6" Height="6"/>
<TextBox x:Name="tbColorR" TextWrapping="Wrap" Text="{Binding NewColor.R}"/>

VM:

class ViewModel
{
    Palette _palette
    Thickness _markerMargin;

    public Thickness MarkerMargin
    {
        get { return _markerMargin; }
        set
        {
            _markerMargin = value;
            _palette.DeterminateColorInPoint((int)_markerMargin.Left, (int)_markerMargin.Top);
            OnPropertyChanged();
        }
    }

    public ViewModel()
    {
        _palette = new Palette();
    }

...
}

Palette class:

class Palette
{
   Color[,] _paletteColors;
   Color _newColor;
   public Color NewColor
   {
       get { return _newColor; }
       set
       {
           _newColor = value;
           OnPropertyChanged();
       }
   }

    public void DeterminateColorInPoint(int x, int y)
    {
        _newColor = _paletteColors[x, y];
    }

...
}

Answer 1

As I can see your DeterminateColorInPoint(int x, int y) method doesn't raise the OnPropertyChanged() of a NewColor property, thus XAML won't never know that the NewColor was changed. You have to change NewColor directly and not by its backing field like this NewColor = _paletteColors[x, y]; .

give me to know if i was helped. regards,