UserPreferenceChangingEventArgs.Category Property
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Gets the category of user preferences that is changing.
public:
property Microsoft::Win32::UserPreferenceCategory Category { Microsoft::Win32::UserPreferenceCategory get(); };
public Microsoft.Win32.UserPreferenceCategory Category { get; }
member this.Category : Microsoft.Win32.UserPreferenceCategory
Public ReadOnly Property Category As UserPreferenceCategory
One of the UserPreferenceCategory values that indicates the category of user preferences that is changing.
The following code example demonstrates how to use the UserPreferenceChangingEventArgs type to monitor the UserPreferenceChanging event. This code example is part of a larger example provided for the SystemEvents class.
#using <System.dll>
using namespace System;
using namespace Microsoft::Win32;
// This method is called when a user preference changes.
void SystemEvents_UserPreferenceChanging(Object^ sender,
UserPreferenceChangingEventArgs^ e)
{
Console::WriteLine("The user preference is changing. Category={0}",
e->Category);
}
// This method is called when the palette changes.
void SystemEvents_PaletteChanged(Object^ sender, EventArgs^ e)
{
Console::WriteLine("The palette changed.");
}
// This method is called when the display settings change.
void SystemEvents_DisplaySettingsChanged(Object^ sender,
EventArgs^ e)
{
Console::WriteLine("The display settings changed.");
}
int main()
{
// Set the SystemEvents class to receive event notification
// when a user preference changes, the palette changes, or
// when display settings change.
SystemEvents::UserPreferenceChanging += gcnew
UserPreferenceChangingEventHandler(
SystemEvents_UserPreferenceChanging);
SystemEvents::PaletteChanged += gcnew
EventHandler(SystemEvents_PaletteChanged);
SystemEvents::DisplaySettingsChanged += gcnew
EventHandler(SystemEvents_DisplaySettingsChanged);
// For demonstration purposes, this application sits idle
// waiting for events.
Console::WriteLine("This application is waiting for system events.");
Console::WriteLine("Press <Enter> to terminate this application.");
Console::ReadLine();
}
// This code produces the following output.
//
// This app is waiting for system events.
// Press <Enter> to terminate this application.
// Display Settings changed.
// User preference is changing. Category=General
using System;
using Microsoft.Win32;
public sealed class App
{
static void Main()
{
// Set the SystemEvents class to receive event notification when a user
// preference changes, the palette changes, or when display settings change.
SystemEvents.UserPreferenceChanging += new
UserPreferenceChangingEventHandler(SystemEvents_UserPreferenceChanging);
SystemEvents.PaletteChanged += new
EventHandler(SystemEvents_PaletteChanged);
SystemEvents.DisplaySettingsChanged += new
EventHandler(SystemEvents_DisplaySettingsChanged);
// For demonstration purposes, this application sits idle waiting for events.
Console.WriteLine("This application is waiting for system events.");
Console.WriteLine("Press <Enter> to terminate this application.");
Console.ReadLine();
}
// This method is called when a user preference changes.
static void SystemEvents_UserPreferenceChanging(object sender, UserPreferenceChangingEventArgs e)
{
Console.WriteLine("The user preference is changing. Category={0}", e.Category);
}
// This method is called when the palette changes.
static void SystemEvents_PaletteChanged(object sender, EventArgs e)
{
Console.WriteLine("The palette changed.");
}
// This method is called when the display settings change.
static void SystemEvents_DisplaySettingsChanged(object sender, EventArgs e)
{
Console.WriteLine("The display settings changed.");
}
}
// This code produces the following output.
//
// This app is waiting for system events.
// Press <Enter> to terminate this application.
// Display Settings changed.
// User preference is changing. Category=General
Imports Microsoft.Win32
Imports System.Windows.Forms
Friend Class Form1
Inherits System.Windows.Forms.Form
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Set the SystemEvents class to receive event notification
'when a user preference changes, the palette changes, or
'when display settings change.
AddHandler SystemEvents.UserPreferenceChanging, _
AddressOf SystemEvents_UserPreferenceChanging
AddHandler SystemEvents.PaletteChanged, _
AddressOf SystemEvents_PaletteChanged
AddHandler SystemEvents.DisplaySettingsChanged, _
AddressOf SystemEvents_DisplaySettingsChanged
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If (components IsNot Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
Private components As System.ComponentModel.IContainer
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.SuspendLayout()
'
'Form1
'
Me.ClientSize = New System.Drawing.Size(648, 398)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
' This method is called when a user preference changes.
Private Sub SystemEvents_UserPreferenceChanging( _
ByVal sender As Object, _
ByVal e As UserPreferenceChangingEventArgs)
MessageBox.Show("UserPreferenceChanging: " & _
e.Category.ToString())
End Sub
' This method is called when the palette changes.
Private Sub SystemEvents_PaletteChanged( _
ByVal sender As Object, _
ByVal e As EventArgs)
MessageBox.Show("PaletteChanged")
End Sub
' This method is called when the display settings change.
Private Sub SystemEvents_DisplaySettingsChanged( _
ByVal sender As Object, _
ByVal e As EventArgs)
MessageBox.Show("The display settings changed.")
End Sub
End Class
Produk | Versi |
---|---|
.NET | 8 (package-provided), 9 (package-provided) |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7 (package-provided), 4.7, 4.7.1 (package-provided), 4.7.1, 4.7.2 (package-provided), 4.7.2, 4.8 (package-provided), 4.8, 4.8.1 |
.NET Standard | 2.0 (package-provided) |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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