System.RuntimeMethodHandle.IsNullHandle C# (CSharp) Method

        internal bool IsNullHandle() 
        { 
            return m_ptr.ToPointer() == null; 
        }

        public static MethodBase GetMethodFromHandle(RuntimeMethodHandle handle)
        {
            if (handle.IsNullHandle())
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidHandle"));

#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetMethodFromHandle();
            }
#endif

            MethodBase m = RuntimeType.GetMethodBase(handle.GetMethodInfo());

            Type declaringType = m.DeclaringType;

#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage)  && declaringType != null)
            {
                FrameworkEventSource.Log.EndGetMethodFromHandle(declaringType.GetFullNameForEtw(), m.GetFullNameForEtw());
            }
#endif

            if (declaringType != null && declaringType.IsGenericType)
                throw new ArgumentException(String.Format(
                    CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_MethodDeclaringTypeGeneric"), 
                    m, declaringType.GetGenericTypeDefinition()));
 
            return m;
        }