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MethodImplOptions Enumeration

.NET Framework 4.5

Other Versions

Defines the details of how a method is implemented.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace: System.Runtime.CompilerServices
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

[SerializableAttribute]
[FlagsAttribute]
[ComVisibleAttribute(true)]
public enum MethodImplOptions

Members

	Member name	Description
	AggressiveInlining	The method should be inlined if possible.
	ForwardRef	The method is declared, but its implementation is provided elsewhere.
	InternalCall	The call is internal, that is, it calls a method that is implemented within the common language runtime.
	NoInlining	The method cannot be inlined. Inlining is an optimization by which a method call is replaced with the method body.
	NoOptimization	The method is not optimized by the just-in-time (JIT) compiler or by native code generation (see Ngen.exe) when debugging possible code generation problems.
	PreserveSig	The method signature is exported exactly as declared.
	Synchronized	The method can be executed by only one thread at a time. Static methods lock on the type, whereas instance methods lock on the instance. Only one thread can execute in any of the instance functions, and only one thread can execute in any of a class's static functions.
	Unmanaged	The method is implemented in unmanaged code.

Remarks

This enumeration is used with the MethodImplAttributeattribute.

You can specify multiple MethodImplOptions values by using the bitwise OR operator.

Note
Locking on the instance or on the type, as with the Synchronized flag, is not recommended for public types, because code other than your own can take locks on public types and instances. This might cause deadlocks or other synchronization problems.

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.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

Platforms

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.

Reference

System.Runtime.CompilerServices Namespace

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