MethodImplOptions Enumeration

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

Defines the details of how a method is implemented.

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

public enum class MethodImplOptions

Member nameDescription
UnmanagedThe method is implemented in unmanaged code.
ForwardRefThe method is declared, but its implementation is provided elsewhere.
PreserveSigThe method signature is exported exactly as declared.
InternalCallThe call is internal, that is, it calls a method that is implemented within the common language runtime.
SynchronizedThe 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.
NoInliningThe method cannot be inlined. Inlining is an optimization by which a method call is replaced with the method body.

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.