次の方法で共有

  • [アーティクル]

Interlocked.Decrement Method (Int64%)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Decrements the specified 64-bit signed integer variable and stores the result, as an atomic operation.

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

Syntax

'Declaration
Public Shared Function Decrement ( _
    ByRef location As Long _
) As Long

public static long Decrement(
    ref long location
)

Parameters

  • location
    Type: System.Int64%
    The variable whose value is to be decremented.

Return Value

Type: System.Int64
The decremented value.

Exceptions

Exception Condition
ArgumentNullException

The address of location is a null pointer.

Remarks

This method handles an overflow condition by wrapping: If location = Int64.MinValue, location - 1 = Int64.MaxValue. No exception is thrown.

The 64-bit overloads of the Increment, Decrement, and Add methods are truly atomic only on systems where a System.IntPtr is 64 bits long. On other systems, these methods are atomic with respect to each other, but not with respect to other means of accessing the data. Thus, to be thread safe on 32-bit systems, any access to a 64-bit value must be made through the members of the Interlocked class.

Version Notes

Silverlight for Windows Phone Silverlight for Windows Phone

 64-bit members of the Interlocked class are present but not supported.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

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