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Interlocked.Add Method (Int32, Int32)

Adds two 32-bit integers and replaces the first integer with the sum, as an atomic operation.

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

public static int Add(
	ref int location1,
	int value
)

Parameters

location1
Type: System.Int32

A variable containing the first value to be added. The sum of the two values is stored in location1.

value
Type: System.Int32

The value to be added to the integer at location1.

Return Value

Type: System.Int32
The new value stored at location1.

ExceptionCondition
NullReferenceException

The address of location1 is a null pointer.

This method handles an overflow condition by wrapping: if the value at location1 is Int32.MaxValue and value is 1, the result is Int32.MinValue; if value is 2, the result is (Int32.MinValue + 1); and so on. No exception is thrown.

.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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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