CompareExchange Method (Int32, Int32, Int32)

Interlocked.CompareExchange Method (Int32%, Int32, Int32)

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

Compares two 32-bit signed integers for equality and, if they are equal, replaces one of the values.

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

'Declaration
Public Shared Function CompareExchange ( _
	ByRef location1 As Integer, _
	value As Integer, _
	comparand As Integer _
) As Integer

Parameters

location1
Type: System.Int32 %
The destination whose value is compared with comparand and possibly replaced.
value
Type: System.Int32
The value that replaces the destination value if the comparison results in equality.
comparand
Type: System.Int32
The value that is compared to the value at location1.

Return Value

Type: System.Int32
The original value in location1.

ExceptionCondition
NullReferenceException

The address of location1 is a null pointer.

If comparand and the value in location1 are equal, then value is stored in location1. Otherwise, no operation is performed. The comparison and the exchange are performed as an atomic operation. The return value of CompareExchange is the original value in location1, whether or not the exchange takes place.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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