Hiding a WPF Window Other Than MainWindow

Question

I have a WPF application with 3 windows: MainWindow, SubWindow1, and SubWindow2.

I'd like to be able to show and hide those windows.

I can hide and show MainWindow from either SubWindow1 or SubWindow2 by using Application.Current.MainWindow.Show/Hide();, but I cannot figure out how to hide SubWindow1 from SubWindow2 or vice versa.

How do I do this?

Answer 1

Hi,
try following demo:

<Application x:Class="Application"  
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
             xmlns:local="clr-namespace:WpfApp1"  
             StartupUri="MainWindow.xaml">  
  <Application.Resources>  
    <local:ViewModel x:Key="vm"/>  
  </Application.Resources>  
</Application>  
  
  
<Window x:Class="MainWindow"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WpfApp1"  
        mc:Ignorable="d"  
        Title="MainWindow" Height="450" Width="800">  
  <StackPanel DataContext="{Binding Source={StaticResource vm}}">  
    <Button Content="SubWindow1" Command="{Binding}" CommandParameter="SubWindow1" Margin="10"/>  
    <Button Content="SubWindow2" Command="{Binding}" CommandParameter="SubWindow2" Margin="10"/>  
  </StackPanel>  
</Window>  
  
  
<Window x:Class="SubWindow1"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WpfApp1"  
        mc:Ignorable="d"  
        Title="SubWindow1" Height="450" Width="800">  
  <StackPanel DataContext="{Binding Source={StaticResource vm}}">  
    <Button Content="SubWindow1" Command="{Binding}" CommandParameter="SubWindow1" Margin="10"/>  
    <Button Content="SubWindow2" Command="{Binding}" CommandParameter="SubWindow2" Margin="10"/>  
  </StackPanel>  
</Window>  
  
  
<Window x:Class="SubWindow2"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WpfApp1"  
        mc:Ignorable="d"  
        Title="SubWindow2" Height="450" Width="800">  
  <StackPanel DataContext="{Binding Source={StaticResource vm}}">  
    <Button Content="SubWindow1" Command="{Binding}" CommandParameter="SubWindow1" Margin="10"/>  
    <Button Content="SubWindow2" Command="{Binding}" CommandParameter="SubWindow2" Margin="10"/>  
  </StackPanel>  
</Window>  
  
  
Public Class ViewModel  
  Implements ICommand  
  
  Private _wnds As Dictionary(Of String, Window)  
  Private ReadOnly Property Wnds As Dictionary(Of String, Window)  
    Get  
      If Me._wnds Is Nothing Then  
        _wnds = New Dictionary(Of String, Window)  
        _wnds.Add("MainWindow", Application.Current.MainWindow)  
        _wnds.Add("SubWindow1", New SubWindow1)  
        _wnds.Add("SubWindow2", New SubWindow2)  
      End If  
      Return Me._wnds  
    End Get  
  End Property  
  
  Public Event CanExecuteChanged As EventHandler Implements ICommand.CanExecuteChanged  
  Public Sub Execute(parameter As Object) Implements ICommand.Execute  
    Dim wnd As Window = wnds(parameter.ToString)  
    If wnd IsNot Nothing Then  
      If wnd.Visibility = Visibility.Visible Then wnd.Hide() Else wnd.Show()  
    End If  
  End Sub  
  Public Function CanExecute(parameter As Object) As Boolean Implements ICommand.CanExecute  
    Return True  
  End Function  
  
  Protected Overrides Sub Finalize()  
    For Each kvp In Me._wnds  
      kvp.Value.Close()  
    Next  
  End Sub  
  
End Class  
  
  

Result: