MethodImplAttribute.cs

using System.Reflection;
using System.Runtime.InteropServices;

namespace System.Runtime.CompilerServices
{
    [Serializable]
    [AttributeUsage(AttributeTargets.Constructor | AttributeTargets.Method, Inherited = false)]
    [ComVisible(true)]
    [__DynamicallyInvokable]
    public sealed class MethodImplAttribute : Attribute
    {
        internal MethodImplOptions _val;

        public MethodCodeType MethodCodeType;

        [__DynamicallyInvokable]
        public MethodImplOptions Value
        {
            [__DynamicallyInvokable]
            get
            {
                return _val;
            }
        }

        internal MethodImplAttribute(MethodImplAttributes methodImplAttributes)
        {
            MethodImplOptions methodImplOptions = MethodImplOptions.Unmanaged | MethodImplOptions.ForwardRef | MethodImplOptions.PreserveSig | MethodImplOptions.InternalCall | MethodImplOptions.Synchronized | MethodImplOptions.NoInlining | MethodImplOptions.AggressiveInlining | MethodImplOptions.NoOptimization;
            _val = (MethodImplOptions)((int)methodImplAttributes & (int)methodImplOptions);
        }

        [__DynamicallyInvokable]
        public MethodImplAttribute(MethodImplOptions methodImplOptions)
        {
            _val = methodImplOptions;
        }

        public MethodImplAttribute(short value)
        {
            _val = (MethodImplOptions)value;
        }

        public MethodImplAttribute()
        {
        }
    }
}