Question

i create a dependency property to close a view from view model,

dependencyProperty:

  public static class WindowBehaviors 
  {      
     public static readonly DependencyProperty IsOpenProperty =
              DependencyProperty.RegisterAttached("IsOpen"
             , typeof(bool),
             typeof(WindowBehaviors),
             new UIPropertyMetadata(false, IsOpenChanged));

    private static void IsOpenChanged(DependencyObject   obj,DependencyPropertyChangedEventArgs args)
    {
        Window window = Window.GetWindow(obj);

        if (window != null && ((bool)args.NewValue))
            window.Close();
    }


    public static bool GetIsOpen(Window target)
    {
        return (bool)target.GetValue(IsOpenProperty);
    }

    public static void SetIsOpen(Window target, bool value)
    {
        target.SetValue(IsOpenProperty, value);
    }
}

and use it in my xaml like this:

<window
...
Command:WindowBehaviors.IsOpen="True">

it work’s fine,but when i want to bind it to a property in viewModel,it dosen’t work,and i guess,it dosen’t work because i define the resource later in xaml.

in xaml:

 <Window.Resources>
     <VVM:myVieModel x:Key="myVieModel"/>
 </Window.Resources>

and i don’t know what should i do,where should i put this:

Command:WindowBehaviors.IsOpen="{binding Isopen}"

Answer 1

Thanks for your helps,i fixed it and here is my solution,
i used to use MVVMToolkit but now i’m useing MVVMlight and as you know in MVVMLight,we just define Application Resources Once in App.xaml.so we can bind all the window’s properties simply,hope this can help some people who has the same problem!!

app.xaml

  <Application.Resources>
    <!--Global View Model Locator-->
    <vm:ViewModelLocator x:Key="Locator"
                         d:IsDataSource="True" />
  </Application.Resources>

and in the window(view)

DataContext="{Binding DefaultSpecItemVM, Source={StaticResource Locator}}"

and it works perfect.:D