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MethodImplAttributes Enum

  • Reference

Definition

Namespace:
System.Reflection
Assembly:
System.Reflection.Primitives.dll
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Specifies flags for the attributes of a method implementation.

This enumeration supports a bitwise combination of its member values.

This API supports the product infrastructure and is not intended to be used directly from your code.

public enum class MethodImplAttributes
public enum MethodImplAttributes
[System.Flags]
[System.Serializable]
public enum MethodImplAttributes
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum MethodImplAttributes
type MethodImplAttributes = 
[<System.Flags>]
[<System.Serializable>]
type MethodImplAttributes = 
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type MethodImplAttributes = 
Public Enum MethodImplAttributes
Inheritance
Object
ValueType
Enum
MethodImplAttributes
Attributes
FlagsAttribute SerializableAttribute ComVisibleAttribute

Fields

Name Value Description
IL 0

Specifies that the method implementation is in Microsoft intermediate language (MSIL).
Managed 0

Specifies that the method is implemented in managed code.
Native 1

Specifies that the method implementation is native.
OPTIL 2

Specifies that the method implementation is in Optimized Intermediate Language (OPTIL).
CodeTypeMask 3

Specifies flags about code type.
Runtime 3

Specifies that the method implementation is provided by the runtime.
ManagedMask 4

Specifies whether the method is implemented in managed or unmanaged code.
Unmanaged 4

Specifies that the method is implemented in unmanaged code.
NoInlining 8

Specifies that the method cannot be inlined.
ForwardRef 16

Specifies that the method is not defined.
Synchronized 32

Specifies that the method is single-threaded through the body. Static methods (Shared in Visual Basic) lock on the type, whereas instance methods lock on the instance. You can also use the C# lock statement or the Visual Basic SyncLock statement for this purpose.
NoOptimization 64

Specifies 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.
PreserveSig 128

Specifies that the method signature is exported exactly as declared.
AggressiveInlining 256

Specifies that the method should be inlined wherever possible.
AggressiveOptimization 512

Specifies that the method should be optimized whenever possible.
SecurityMitigations 1024

This member is reserved for future use. It was introduced in .NET Framework 4.8.
InternalCall 4096

Specifies an internal call.
MaxMethodImplVal 65535

Specifies a range check value.

Remarks

The attributes are combined using the bitwise OR operation as follows:

Code implementation masks:

  • CodeTypeMask

  • IL

  • Native

  • OPTIL

  • Runtime

Managed masks:

  • ManagedMask

  • Unmanaged

  • Managed

Implementation information and interop masks:

  • ForwardRef

  • PreserveSig

  • InternalCall

  • Synchronized

  • NoInlining

  • NoOptimization

  • MaxMethodImplVal

  • SecurityMitigations (Available starting with .NET Framework 4.8.)

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.

Applies to

See also