Timer Constructor (TimerCallback, Object, UInt32, UInt32)

Initializes a new instance of the Timer class, using 32-bit unsigned integers to measure time intervals.

This API is not CLS-compliant. 

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

[CLSCompliantAttribute(false)]
public Timer(
	TimerCallback callback,
	Object state,
	uint dueTime,
	uint period
)

Parameters

callback
Type: System.Threading.TimerCallback
A TimerCallback delegate representing a method to be executed.
state
Type: System.Object
An object containing information to be used by the callback method, or null.
dueTime
Type: System.UInt32
The amount of time to delay before callback is invoked, in milliseconds. Specify Timeout.Infinite to prevent the timer from starting. Specify zero (0) to start the timer immediately.
period
Type: System.UInt32
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 Infinite.

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.

[Visual Basic]

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 zero (0), 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 zero (0) or Infinite and dueTime is not 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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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