MethodImplOptions MethodImplOptions MethodImplOptions MethodImplOptions Enum

Definition

Namespace:
System.Runtime.CompilerServices System.Runtime.CompilerServices System.Runtime.CompilerServices System.Runtime.CompilerServices
Assemblies:
System.Runtime.dll, mscorlib.dll, netstandard.dll

Defines the details of how a method is implemented.

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

public enum class MethodImplOptions
[System.Flags]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum MethodImplOptions
type MethodImplOptions = 
Public Enum MethodImplOptions
Inheritance
ObjectObjectObjectObject
ValueTypeValueTypeValueTypeValueType
EnumEnumEnumEnum
MethodImplOptionsMethodImplOptionsMethodImplOptionsMethodImplOptions
Attributes
FlagsAttribute ComVisibleAttribute SerializableAttribute

Fields

AggressiveInlining AggressiveInlining AggressiveInlining AggressiveInlining 256

The method should be inlined if possible.
AggressiveOptimization AggressiveOptimization AggressiveOptimization AggressiveOptimization 512

The method contains a hot path and should be optimized.
ForwardRef ForwardRef ForwardRef ForwardRef 16

The method is declared, but its implementation is provided elsewhere.
InternalCall InternalCall InternalCall InternalCall 4096

The call is internal, that is, it calls a method that is implemented within the common language runtime.
NoInlining NoInlining NoInlining NoInlining 8

The method cannot be inlined. Inlining is an optimization by which a method call is replaced with the method body.
NoOptimization NoOptimization NoOptimization NoOptimization 64

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 PreserveSig PreserveSig PreserveSig 128

The method signature is exported exactly as declared.
SecurityMitigations SecurityMitigations SecurityMitigations SecurityMitigations 1024

The JIT compiler should look for security mitigation attributes, such as the user-defined System.Runtime.CompilerServices.SecurityMitigationsAttribute. If found, the JIT compiler applies any related security mitigations. Available starting with .NET Framework 4.8.
Synchronized Synchronized Synchronized Synchronized 32

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 Unmanaged Unmanaged Unmanaged 4

The method is implemented in unmanaged code.

Remarks

This enumeration is used with the MethodImplAttribute attribute.

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.

Applies to