Timer Constructor (TimerCallback, Object, Int64, Int64)

Timer Constructor (TimerCallback, Object, Int64, Int64)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Initializes a new instance of the Timer class, using 64-bit signed integers to measure time intervals.

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)

public Timer(
	TimerCallback callback,
	Object state,
	long dueTime,
	long period
)

Parameters

callback
Type: System.Threading.TimerCallback
A delegate that represents a method to be executed.
state
Type: System.Object
An object that contains information to be used by the callback method, or null.
dueTime
Type: System.Int64
The amount of time to delay before callback is invoked, in milliseconds. Specify Timeout.Infinite to prevent the timer from starting. Specify 0 (zero) to start the timer immediately.
period
Type: System.Int64
The time interval between invocations of callback, in milliseconds. Specify Timeout.Infinite to disable periodic signaling.

ExceptionCondition
ArgumentOutOfRangeException

The dueTime or period parameter is negative and is not equal to Timeout.Infinite.

-or-

The dueTime or period parameter is greater than 4294967294 (UInt32.MaxValue - 1).

ArgumentNullException

The callback parameter is null.

The delegate specified by the callback parameter is invoked once after dueTime elapses, and thereafter each time the period time interval elapses.

NoteNote:

Visual Basic users can omit the TimerCallback constructor, and simply use the AddressOf operator when specifying the callback method. Visual Basic automatically calls the correct delegate constructor.

If dueTime is 0 (zero), callback is invoked immediately. If dueTime is Timeout.Infinite, callback is not invoked; the timer is disabled but can be re-enabled by calling the Change method.

If period is 0 (zero) or Timeout.Infinite, and dueTime is not Timeout.Infinite, callback is invoked once; the periodic behavior of the timer is disabled but can be re-enabled using the Change method.

The method specified for callback should be reentrant, because it is called on ThreadPool threads. The method can be executed simultaneously on two thread pool threads if the timer interval is less than the time required to execute the method, or if all thread pool threads are in use and the method is queued multiple times.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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