CompareExchange Method (IntPtr, IntPtr, IntPtr)

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

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

Compares two platform-specific handles or pointers for equality and, if they are equal, replaces one of them.

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

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

Parameters

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

Return Value

Type: System.IntPtr
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 this method is the original value in location1, whether or not the exchange takes place.

NoteNote:

IntPtr is a platform-specific type.

Windows Phone OS

Supported in: 8.1, 8.0

Show:
© 2017 Microsoft