Opening multiple window with same ViewModel using MVVM

Question

This question is in reference to this link Opening new window in MVVM WPF.
I want to open new window in some service. Following is my code

This is a window service which I am calling from ViewModel

public class WindowService : IWindowService
{
    public void ShowWindow(object viewModel)
    {

        var win = new Window {Content = viewModel};
        win.Show();
    }
}

Following is my App.xaml code

<DataTemplate DataType="{x:Type viewModel:MainViewModel}" >
        <viewModel:ChildWindow />
</DataTemplate>

Now this works fine for all windows which have different ViewModel. But when I want to open another window which is using same view model but their view is not same,I can not define data template of same type in App.xaml.

How do I open multiple new window which have same ViewModel? Should I create different ViewModel for each window?

Mike Fuchs Mike Fuchs · Accepted Answer · 2014-09-19T14:24:25

I have shown an alternative way of opening and closing windows here.

You could add a DependencyProperty e.g. DataContext to the OpenCloseWindowBehavior, use it to pass the ViewModel, and hook up the window's DataContext to this ViewModel in the code of the behavior. Tell me if you need more help.

<local:OpenCloseWindowBehavior WindowType="local:YellowWindow" Open="{Binding YellowOpen, Mode=TwoWay}" DataContext="{Binding SomeViewModel}" />

Opening multiple window with same ViewModel using MVVM

1 Answers