Interlocked.Exchange<T> Method (T, T)

Sets a variable of the specified type T to a specified value and returns the original value, as an atomic operation.

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

public static T Exchange<T>(
	ref T location1,
	T value
)
where T : class

Type Parameters

T

The type to be used for location1 and value. This type must be a reference type.

Parameters

location1
Type: T

The variable to set to the specified value. This is a reference parameter (ref in C#, ByRef in Visual Basic).

value
Type: T

The value to which the location1 parameter is set.

Return Value

Type: T
The original value of location1.

ExceptionCondition
NullReferenceException

The address of location1 is a null pointer.

This method only supports reference types. There are overloads of the Exchange method for the value types Int32, Int64, IntPtr, Single, and Double, but there is no support for other value types.

NoteNote

This method overload is preferable to the Exchange(Object, Object) method overload, because the latter requires the destination object to be accessed late-bound.

.NET Framework

Supported in: 4.6, 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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: 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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