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

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function CompareExchange ( _
    ByRef location1 As Object, _
    value As Object, _
    comparand As Object _
) As Object

[SecuritySafeCriticalAttribute]
public static Object CompareExchange(
    ref Object location1,
    Object value,
    Object comparand
)

Exceptions

Remarks

If comparand and the object 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.

Beginning with .NET Framework version 2.0, the CompareExchange<T>(T%, T, T) method overload provides a type-safe alternative for reference types.

Note:
The objects are compared for reference equality, rather than Object.Equals. As a result, two boxed instances of the same value type (for example, the integer 3) always appear to be unequal, and no operation is performed. Do not use this overload with value types.

Version Information

Silverlight

Supported in: 5, 4

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

See Also

Reference

Other Resources