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SemaphoreSlim.Release Method

.NET Framework 4.6 and 4.5

Releases the SemaphoreSlim object once.

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

public int Release()

Return Value

Type: System.Int32
The previous count of the SemaphoreSlim.


The current instance has already been disposed.


The SemaphoreSlim has already reached its maximum size.

A call to the Release() method increments the CurrentCount property by one. If the value of the CurrentCount property is zero before this method is called, the method also allows one thread or task blocked by a call to the Wait or WaitAsync method to enter the semaphore.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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