窗口绑定到UserControl ViewModel

Question

I need help with binding a window to a user control view model. Here's my user control, nice and simple.

<UserControl x:Class="WindowBindTest.UserControlTest"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" 
         xmlns:ViewModel="clr-namespace:WindowBindTest.UserControlViewModel"
         d:DesignHeight="300" d:DesignWidth="300">
<UserControl.DataContext>
<ViewModel:UserControlViewModel></ViewModel:UserControlViewModel>
</UserControl.DataContext>
<Grid>            
</Grid>
</UserControl>

Here's my view model

namespace WindowBindTest
{
    public class UserControlViewModel
    {
        public Window hostWindow { get; set; }|
        public UserControlViewModel()
        {
            // I want to set the host window
            // If something isn't defined then close the host window.
        }    

    }
}

I could use a button to close the window but what if I didn't want to use a button. Is there a way to do that? Could I pass in the parent window into the constructor?

Answer 1

You can do this in MVVM but you will need to use a service. In fact, this is where MVVM is weak (without using a framework such as Prism et al.). The following is a link to disore's DialogService class on CodeProject . it is awesome, but it will take time to get to grips with how it works.

The above library will enable you to close a View from a ViewModel.

I hope this helps.