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POhow to add property to Window in xaml
 

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    <p>I'm learning MVVM by write an litle app with Login function. In View layer, I have a LoginWindow with some binding like this:</p> <pre><code>&lt;TextBox x:Name="tbxUsername" Grid.Row="0" Grid.Column="1" Width="150" Height="22" Margin="15,10,5,10" Text="{Binding Path=Username, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;PasswordBox View:PasswordHelper.Attach="True" View:PasswordHelper.Password="{Binding Path=Password, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" x:Name="pwdPassword" Grid.Row="1" Grid.Column="1" Width="150" Height="22" Margin="15,10,5,10" /&gt; </code></pre> <p>The problem is i want to implement a binding like this:</p> <pre><code>&lt;Window.Authenticated={Binding Path=Authenticated, UpdateSourceTrigger=PropertyChanged, Mode=OneWay, NotifyOnTargetUpdated=True} TargetUpdated="authenticated_TargetUpdated"/&gt; </code></pre> <p>Authenticated is a bool value which will changed in my viewmodel. Is there an way for me?</p> <p>Edit for @lain: Here my LoginWindow.xaml (style and layout removed).</p> <pre><code>&lt;Window x:Class="ATCheck_View.LoginWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:View="clr-namespace:ATCheck_View" xmlns:ViewModel="clr-namespace:ATCheck_ViewModel;assembly=ATCheck_ViewModel" Title="Login" WindowStartupLocation="CenterScreen" ResizeMode="CanMinimize" SizeToContent="WidthAndHeight" &gt; &lt;Window.DataContext&gt; &lt;ViewModel:LoginViewModel /&gt; &lt;/Window.DataContext&gt; &lt;Grid&gt; &lt;TextBox x:Name="tbxUsername" Grid.Row="0" Grid.Column="1" Width="150" Height="22" Margin="15,10,5,10" Text="{Binding Path=Username, UpdateSourceTrigger=PropertyChanged, TargetNullValue='atcheck', NotifyOnTargetUpdated=True}"/&gt; &lt;PasswordBox View:PasswordHelper.Attach="True" View:PasswordHelper.Password="{Binding Path=Password, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, TargetNullValue='123456'}" x:Name="pwdPassword" Grid.Row="1" Grid.Column="1" Width="150" Height="22" Margin="15,10,5,10" /&gt; &lt;Button x:Name="btnLogin" Width="65" Height="20" Margin="5,15,10,12" Command="{Binding LoginCommand}" CommandParameter=""&gt; &lt;TextBlock VerticalAlignment="Center"&gt;Login&lt;/TextBlock&gt; &lt;/Button&gt; &lt;Button x:Name="btnCancel" Width="60" Height="20" Margin="5,15,5,12" Click="btnCancel_Click"&gt; &lt;TextBlock VerticalAlignment="Center"&gt;Cancel&lt;/TextBlock&gt; &lt;/Button&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>LoginViewModel:</p> <pre><code>public class LoginViewModel: ViewModelBase { private string _username; private string _password; private bool _authenticated = false; public string Username { get { return _username; } set { _username = value; RaisePropertyChangedEvent("Username"); } } public string Password { get { return _password; } set { _password = value; RaisePropertyChangedEvent("Password"); } } public bool Authenticated { get { return _authenticated; } private set { _authenticated = value; RaisePropertyChangedEvent("Authenticated"); } } public ICommand LoginCommand { get { return new RelayCommand&lt;string&gt;(Login); } } private void Login(string p) { Authenticated = true; Console.WriteLine("Infomation:"); Console.WriteLine(Authenticated); Console.WriteLine(Username); Console.WriteLine(Password); } } </code></pre> <p>ViewModelBase implement INotifyPropertyChanged and RelayCommand that I folow John Smith's article.</p> <p>@nit: I tried as your lead, propdp, rebuild, and type Authenticated folow "Window" tag, but nothing happened when I press commbo Ctrl + Space.</p> <p>What all i want to do is an messagebox that will show when Authenticated change from False to True:</p> <pre><code>private bool _authenticated = false; public bool Authenticated { get { return _authenticated; } set { if (value == true) { MessageBox.Show("Logged!"); } } } public LoginWindow() { InitializeComponent(); LoginViewModel myViewModel = (LoginViewModel)this.DataContext; myViewModel.PropertyChanged += myViewModel_PropertyChanged; } void myViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { if (e.PropertyName == "Authenticated") { Authenticated = ((LoginViewModel)sender).Authenticated; } } </code></pre>
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    1. USLionel Nguyen
    1. USLionel Nguyen
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    1. COCan you show us the code in your View and ViewModel as well? How is your Authenticated property getting updated?
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      1. POhow to add property to Window in xaml
      1. USIain
    2. COSorry, still don't understand what is setting your Authenticated property and why you want to bind it to the Window like that. When something sets `Authenticated = true` on your ViewModel what do you want to happen on the UI?
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      1. POhow to add property to Window in xaml
      1. USIain
 

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