Question

I am new to WPF technology and I am using MVVM architecture. I want my border to change color when property bound in ViewModel changes its value. lets look at the code :

In my XAML :

<Window.Resources>
 <Style TargetType="{x:Type Border}" x:Key="LineColor">
            <Setter Property="Background" Value="Transparent"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding lcolor}" Value="Blue">
                    <Setter Property="Background" Value="Green">

                    </Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
</Window.Resources>

I am binding it to my border :

<Border CornerRadius="1,1,0,0" Style="{StaticResource LineColor}" >

Then In my ViewModel I took simple string :

public string lcolor="Blue";

But its not working at all. Please help me out.

EDIT: I tried it as follows:

public Boolean lcolor
    {
            get { return (Boolean)this.GetValue(StateProperty); }
            set { this.SetValue(StateProperty, value); }
    }

    public static readonly DependencyProperty StateProperty = DependencyProperty.Register(
          "lcolor", typeof(Boolean), typeof(CallControlViewModel));

But it’s giving me the following error :

Error 9

“PSWGS.Client.Module.CallControl.ViewModels.CallControlViewModel’ does not contain a definition for ‘GetValue’ and no extension method ‘GetValue’ accepting a first argument of type ‘PSWGS.Client.Module.CallControl.ViewModels.CallControlViewModel’ could be found (are you missing a using directive or an assembly reference?)

Answer 1

Read the data binding overview and about debugging bindings, once you understood everything you may come back.

lcolor is a field, it needs to be a property, further you might want to have a look at INPC.