Windows Dev Center

MethodImplOptions Enumeration

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
AggressiveInliningThe method should be inlined if possible.
Supported by the XNA FrameworkForwardRefThe method is declared, but its implementation is provided elsewhere.
Supported by the XNA FrameworkInternalCallThe call is internal, that is, it calls a method that is implemented within the common language runtime.
Supported by the XNA FrameworkSupported by Portable Class LibraryNoInliningThe method cannot be inlined. Inlining is an optimization by which a method call is replaced with the method body.
Supported by Portable Class LibraryNoOptimizationThe 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.
Supported by the XNA FrameworkSupported by Portable Class LibraryPreserveSigThe method signature is exported exactly as declared.
Supported by the XNA FrameworkSynchronizedThe 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 FrameworkUnmanagedThe method is implemented in unmanaged code.

This enumeration is used with the MethodImplAttributeattribute.

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: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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