项目
11/18/2011

OpCodes.Add_Ovf Field

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Adds two integers, performs an overflow check, and pushes the result onto the evaluation stack.

Namespace: System.Reflection.Emit
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Shared ReadOnly Add_Ovf As OpCode

public static readonly OpCode Add_Ovf

Remarks

The following table lists the instruction's hexadecimal and Microsoft intermediate language (MSIL) assembly format, along with a brief reference summary:

Format	Assembly Format	Description
D6	add.ovf	Adds two signed integer values with an overflow check.

The stack transitional behavior, in sequential order, is:

value1 is pushed onto the stack.
value2 is pushed onto the stack.
value2 and value1 are popped from the stack; value1 is added to value2 with a check for overflow.
The result is pushed onto the stack.

OverflowException is thrown if the result is not represented in the result type.

You can perform this operation on signed integers. For floating-point values, use Add.

The acceptable operand types and their corresponding result data type are listed in the table below. If there is no entry for a particular type combination (for example, int32 and float; int32 and int64), it is an invalid MSIL instruction and generates an error.

operand	value1 type	value2 type	result type
add	int32	int32	int32
add	int32	native int	native int
add	int32	&	&
add	int32	*	*
add	int64	int64	int64
add	native int	int32	native int
add	native int	native int	native int
add	native int	&	&
add	native int	*	*
add	F	F	F
add	&	int32	&
add	&	native int	&
add	*	int32	*
add	*	native int	*

The following Emit method overload can use the add.ovf opcode:

ILGenerator.Emit(OpCode)

Version Information

Silverlight

Supported in: 5, 4, 3

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.

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