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MethodImplOptions Enumeration

Updated: March 2012

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)

public enum MethodImplOptions

Member nameDescription
Supported by the XNA FrameworkUnmanagedSpecifies that the method is implemented in unmanaged code.
Supported by the XNA FrameworkForwardRefSpecifies that the method is declared, but its implementation is provided elsewhere.
Supported by the XNA FrameworkPreserveSigSpecifies that the method signature is exported exactly as declared.
Supported by the XNA FrameworkInternalCallSpecifies an internal call. An internal call is a call to a method that is implemented within the common language runtime itself.
Supported by the XNA FrameworkSynchronizedSpecifies that 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.
Supported by the XNA FrameworkSupported by Portable Class LibraryNoInliningSpecifies that the method cannot be inlined. Inlining is an optimization by which a method call is replaced with the method body.
NoOptimizationSpecifies that 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.

This enumeration is used with the MethodImplAttribute attribute.

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


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.

.NET Framework

Supported in: 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.




March 2012

Defined inlining.

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