Application.Properties Property

Definition

Namespace:

System.Windows

Assembly:

PresentationFramework.dll

Gets a collection of application-scope properties.

public:
 property System::Collections::IDictionary ^ Properties { System::Collections::IDictionary ^ get(); };

public System.Collections.IDictionary Properties { get; }

member this.Properties : System.Collections.IDictionary

Public ReadOnly Property Properties As IDictionary

Property Value

IDictionary

An IDictionary that contains the application-scope properties.

Examples

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;
                }
            }
        }
    }
}

Imports System.Windows

Namespace VisualBasic
    Partial Public Class App
        Inherits Application
        Private Sub App_Startup(ByVal sender As Object, ByVal e As StartupEventArgs)
            ' Parse command line arguments for "/SafeMode"
            Me.Properties("SafeMode") = False
            Dim i As Integer = 0
            Do While i <> e.Args.Length
                If e.Args(i).ToLower() = "/safemode" Then
                    Me.Properties("SafeMode") = True
                    Exit Do
                End If
                i += 1
            Loop
        End Sub
    End Class
End Namespace

<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"])
            {
                this.Title += " [SafeMode]";
            }
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls

Namespace VisualBasic
    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub MainWindow_Loaded(ByVal sender As Object, ByVal e As EventArgs)
            ' Check for safe mode
            If CBool(Application.Current.Properties("SafeMode")) = True Then
                Me.Title &= " [SafeMode]"
            End If
        End Sub
    End Class
End Namespace

Remarks

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.

The Properties property is thread safe and is available from any thread.

See also

• Startup