I am trying to bind Visibility of Window in WPF by Converter. I am getting the error. System.Windows.StaticResourceExtension System.Windows.StaticResourceExtension

I am providing my code below. My View is enter image description here

<Window x:Class="UI.ChildWindow"
    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:UI"
    xmlns:UtilityValue="clr-namespace:UI.Utility"
    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"        
    mc:Ignorable="d"
    Title="ChildWindow" Height="70" Width="400" WindowStartupLocation="CenterScreen" WindowStyle="None" 
    Visibility="{Binding WindowVisibility, Converter={StaticResource VisibilityConverter}, Mode=TwoWay}">    
<Window.Resources>
    <UtilityValue:TextInputToVisibilityConverter x:Key="TextInputToVisibilityConverter"></UtilityValue:TextInputToVisibilityConverter>
    <UtilityValue:EventToCommandBehavior x:Key="CommandBehavior"></UtilityValue:EventToCommandBehavior>
    <SolidColorBrush x:Key="brushWatermarkBackground" Color="White" />
    <SolidColorBrush x:Key="brushWatermarkForeground" Color="LightSteelBlue" />
    <SolidColorBrush x:Key="brushWatermarkBorder" Color="Indigo" />
    <UtilityValue:BooleanToVisibilityConverter x:Key="VisibilityConverter"></UtilityValue:BooleanToVisibilityConverter>      
    <Style x:Key="EntryFieldStyle" TargetType="Grid" >
        <Setter Property="HorizontalAlignment" Value="Stretch" />
        <Setter Property="VerticalAlignment" Value="Center" />
        <Setter Property="Margin" Value="2" />
    </Style>
</Window.Resources>

My Viewmodel is as followes:

region WindowVisibility

    private bool _windowVisibility=true;
    public bool WindowVisibility
    {
        get { return _windowVisibility; }
        set { _windowVisibility = value;
            OnPropertyChanged("WindowVisibility");
        }
    }

    #endregion

Converter is

public class BooleanToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                if ((bool)value)
                    return Visibility.Visible;
                else
                    return Visibility.Collapsed;
            }
            else
                return Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

This converter works properly with other controls but with this Window it is not working . I would like to know does converter works with Window level or only on controls?

The declaration of the converter in the Resources collection should be before the reference to the converter.

You can fix it like this:

<Window x:Class="UI.ChildWindow"
        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:UI"
        xmlns:UtilityValue="clr-namespace:UI.Utility"
        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"        
        mc:Ignorable="d"
        Title="ChildWindow" Height="70" Width="400" WindowStartupLocation="CenterScreen" WindowStyle="None">
    <Window.Resources>
        <UtilityValue:TextInputToVisibilityConverter x:Key="TextInputToVisibilityConverter"></UtilityValue:TextInputToVisibilityConverter>
        <UtilityValue:EventToCommandBehavior x:Key="CommandBehavior"></UtilityValue:EventToCommandBehavior>
        <SolidColorBrush x:Key="brushWatermarkBackground" Color="White" />
        <SolidColorBrush x:Key="brushWatermarkForeground" Color="LightSteelBlue" />
        <SolidColorBrush x:Key="brushWatermarkBorder" Color="Indigo" />
        <UtilityValue:BooleanToVisibilityConverter x:Key="VisibilityConverter"></UtilityValue:BooleanToVisibilityConverter>
        <Style x:Key="EntryFieldStyle" TargetType="Grid" >
            <Setter Property="HorizontalAlignment" Value="Stretch" />
            <Setter Property="VerticalAlignment" Value="Center" />
            <Setter Property="Margin" Value="2" />
        </Style>
    </Window.Resources>

    <Window.Visibility>
        <Binding Path="WindowVisibility" Converter="{StaticResource VisibilityConverter}" Mode="TwoWay" />
    </Window.Visibility>
</Window>