Interlocked.CompareExchange Method (Int64, Int64, Int64)

Compares two 64-bit signed integers for equality and, if they are equal, replaces the first value.

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

public static long CompareExchange(
	ref long location1,
	long value,
	long comparand
)

Parameters

location1
Type: System.Int64

The destination, whose value is compared with comparand and possibly replaced.

value
Type: System.Int64

The value that replaces the destination value if the comparison results in equality.

comparand
Type: System.Int64

The value that is compared to the value at location1.

Return Value

Type: System.Int64
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 compare and exchange operations are performed as an atomic operation. The return value of CompareExchange is the original value in location1, whether or not the exchange takes place.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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