public static Task Delay(int millisecondsDelay, CancellationToken token = default(CancellationToken))
{
if (millisecondsDelay < 0)
{
throw new ArgumentOutOfRangeException("millisecondsDelay", millisecondsDelay, "The value cannot be less than 0.");
}
if (millisecondsDelay == 0)
{
return(TaskDone);
}
token.ThrowIfCancellationRequested();
// allocate an object to hold the callback in the async state.
object[] state = new object[1];
var completionSource = new TaskCompletionSource <object>(state);
MultimediaTimerCallback callback = (uint id, uint msg, ref uint uCtx, uint rsv1, uint rsv2) => {
// Note we don't need to kill the timer for one-off events.
completionSource.TrySetResult(null);
};
state[0] = callback;
UInt32 userCtx = 0;
var timerId = NativeMethods.TimeSetEvent((uint)millisecondsDelay, (uint)0, callback, ref userCtx, EventTypeSingle);
if (timerId == 0)
{
int error = Marshal.GetLastWin32Error();
throw new Win32Exception(error);
}
return(completionSource.Task);
}
///<example>await AVActions.TaskDelayMs(1);</example>
///<summary>High resolution delay, only use for sub 50ms.</summary>
public static void TaskDelayMs(uint millisecondsDelay)
{
try
{
IntPtr createEvent = CreateEvent(IntPtr.Zero, true, false, null);
MultimediaTimerCallback callbackDone = delegate
{
SetEvent(createEvent);
CloseHandle(createEvent);
};
timeSetEvent(millisecondsDelay, 0, callbackDone, 0, 0);
WaitForSingleObject(createEvent, INFINITE);
callbackDone.EndInvoke(null);
}
catch { }
}
public MultimediaTimer()
{
Callback = new MultimediaTimerCallback(TimerCallbackMethod);
Resolution = 5;
Interval = 10;
}
internal static extern UInt32 TimeSetEvent(UInt32 msDelay, UInt32 msResolution, MultimediaTimerCallback callback, ref UInt32 userCtx, UInt32 eventType);
public MultimediaTimer()
{
_callback = TimerCallbackMethod;
Resolution = 5;
Interval = 10;
}
public WindowsTimer()
{
this.callback = new MultimediaTimerCallback(TimerCallbackMethod);
Resolution = 5;
Interval = 10;
}
internal static extern uint timeSetEvent(uint msDelay, uint msResolution, MultimediaTimerCallback callback, uint userCtx, uint eventType);
