UserPreferenceChangingEventArgs Class

UserPreferenceChangingEventArgs Class


Provides data for the UserPreferenceChanging event.

Namespace:   Microsoft.Win32
Assembly:  System (in System.dll)


[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
[PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]
[PermissionSetAttribute(SecurityAction.InheritanceDemand, Name = "FullTrust")]
public class UserPreferenceChangingEventArgs : EventArgs


Initializes a new instance of the UserPreferenceChangingEventArgs class using the specified user preference category identifier.


Gets the category of user preferences that is changing.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

A UserPreferenceChanging event occurs when a change to a user preference is about to be applied.

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;
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 
        SystemEvents.PaletteChanged += new 
        SystemEvents.DisplaySettingsChanged += new 

        // 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.");

    // 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

.NET Framework
Available since 1.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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