Wait Method (TimeSpan)

SemaphoreSlim.Wait Method (TimeSpan)

.NET Framework 4.6 and 4.5

Blocks the current thread until it can enter the SemaphoreSlim, using a TimeSpan to specify the timeout.

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

public bool Wait(
	TimeSpan timeout


Type: System.TimeSpan

A TimeSpan that represents the number of milliseconds to wait, or a TimeSpan that represents -1 milliseconds to wait indefinitely.

Return Value

Type: System.Boolean

true if the current thread successfully entered the SemaphoreSlim; otherwise, false.

Exception Condition

timeout is a negative number other than -1 milliseconds, which represents an infinite time-out -or- timeout is greater than MaxValue.


The semaphoreSlim instance has been disposed.

If a thread or task is able to enter the semaphore, it decrements the CurrentCount property by one.

If a thread or task is blocked when calling Wait(TimeSpan) and the time-out interval specified by timeout expires, the thread or task doesn’t enter the semaphore, and the CurrentCount property isn’t decremented.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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