Class Preference.EventContext

Definition

Namespace:: Tizen.Applications

Assembly:: Tizen.Applications.Preference.dll

The class manages event handlers of the preference keys. It provides functionality to have event handlers for individual preference keys.


                C#
                
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public class Preference.EventContext

Inheritance: object

Preference.EventContext

Events

View Source

Changed

Occurs whenever there is a change in the value of a preference key.

Declaration


                C#
                
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public event EventHandler<PreferenceChangedEventArgs> Changed

Event Type

Type	Description
System.EventHandler<TEventArgs><PreferenceChangedEventArgs>

Remarks

This event is raised whenever the value of a preference key changes. It provides information about the changed key through the PreferenceChangedEventArgs argument. The Changed event can be used to keep track of any modifications made to preferences during runtime.

Examples

In this example, we show how to handle the Changed event by printing out the key that was modified. We also demonstrate how to subscribe and unsubscribe from the event.


                
                
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    private static void Preference_PreferenceChanged(object sender, PreferenceChangedEventArgs e)
    {
        Console.WriteLine("key {0}", e.Key);
    }

    Preference.EventContext context = null;
    Preference.GetEventContext("active_user").TryGetTarget(out context);
    if(context != null)
    {
        context.Changed += Preference_PreferenceChanged;
    }

    Preference.Set("active_user", "Poe");

    Preference.GetEventContext("active_user").TryGetTarget(out context);
    if (context != null)
    {
        context.Changed -= Preference_PreferenceChanged;
    }

Exceptions

Type	Condition
System.ArgumentException	Thrown when the key does not exist or when there is an invalid parameter.
System.InvalidOperationException	Thrown when the bundle instance has been disposed.