TimerCallback Delegate
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Represents the method that handles calls from a Timer.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- state
- Type: System::Object
An object that contains application-specific information that is relevant to the method invoked by this delegate.
-or-
A null reference (Nothing in Visual Basic).
Use a TimerCallback delegate to specify the method that is called by a Timer. This method does not execute in the thread that created the timer; it executes in a separate thread pool thread that is provided by the system. The TimerCallback delegate invokes the method once after the start time elapses, and continues to invoke it once per timer interval until the Dispose method is called, or until the Timer::Change method is called with the interval value Infinite.
The timer delegate is specified when the timer is constructed, and cannot be changed. The start time for a Timer is passed in the dueTime parameter of the Timer constructors, and the period is passed in the period parameter.
The following example shows how to create the delegate that is used with the Timer class. In this example, the delegate is created implicitly. Its type is inferred by the Visual Basic and C# compilers.
This example creates a timer, uses the Timer::Change method to change its interval, and then uses the Timer::Dispose method to destroy it.
The example displays its output in a TextBlock on the UI thread. To access the TextBlock from the callback thread, the example uses the Dispatcher property to obtain a Dispatcher object for the TextBlock, and then uses the Dispatcher::BeginInvoke method to make the cross-thread call.
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To run this example, see Building examples that have static TextBlock controls for Windows Phone 8. |