Application.Properties Property

Gets a collection of application-scope properties.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)

public IDictionary Properties { get; }
You cannot set this property in XAML.

Property Value

Type: System.Collections.IDictionary
An IDictionary that contains the application-scope properties.

Application exposes a dictionary via Properties which you can use to store application-scope properties. This allows you to share state amongst all code in an AppDomain in a thread-safe fashion, without the need to write your own state code.

Properties stored in Properties must be converted to the appropriate type returned.

TheProperties property is thread safe and is available from any thread.

The following example shows how create and use an application-scope property using Properties.

<Application x:Class="CSharp.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="MainWindow.xaml"
    Startup="App_Startup"
    >
</Application>
using System;
using System.Windows;

namespace CSharp
{
    public partial class App : Application
    {
        void App_Startup(object sender, StartupEventArgs e)
        {
            // Parse command line arguments for "/SafeMode" 
            this.Properties["SafeMode"] = false;
            for (int i = 0; i != e.Args.Length; ++i)
            {
                if (e.Args[i].ToLower() == "/safemode")
                {
                    this.Properties["SafeMode"] = true;
                    break;
                }
            }
        }
    }
}
<Window x:Class="CSharp.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Loaded="MainWindow_Loaded"
    >
  <Grid>


...


  </Grid>
</Window>
using System;
using System.Windows;
using System.Windows.Controls;

namespace CSharp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        void MainWindow_Loaded(object sender, EventArgs e)
        {
            // Check for safe mode 
            if ((bool)Application.Current.Properties["SafeMode"] == true)
            {
                this.Title += " [SafeMode]";
            }
        }
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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