System.Reflection.CustomAttributeData.Init C# (CSharp) Method

        private void Init(MarshalAsAttribute marshalAs)
        {
            Type type = typeof(MarshalAsAttribute);
            m_ctor = type.GetConstructors(BindingFlags.Public | BindingFlags.Instance)[0];
            m_typedCtorArgs = Array.AsReadOnly(new CustomAttributeTypedArgument[]
            {
                new CustomAttributeTypedArgument(marshalAs.Value),
            });

            int i = 3; // ArraySubType, SizeParamIndex, SizeConst
            if (marshalAs.MarshalType != null) i++;
            if (marshalAs.MarshalTypeRef != null) i++;
            if (marshalAs.MarshalCookie != null) i++;
            CustomAttributeNamedArgument[] namedArgs = new CustomAttributeNamedArgument[i];

            i = 0;
            namedArgs[i++] = new CustomAttributeNamedArgument(type.GetField("ArraySubType"), marshalAs.ArraySubType);
            namedArgs[i++] = new CustomAttributeNamedArgument(type.GetField("SizeParamIndex"), marshalAs.SizeParamIndex);
            namedArgs[i++] = new CustomAttributeNamedArgument(type.GetField("SizeConst"), marshalAs.SizeConst);
            if (marshalAs.MarshalType != null)
                namedArgs[i++] = new CustomAttributeNamedArgument(type.GetField("MarshalType"), marshalAs.MarshalType);
            if (marshalAs.MarshalTypeRef != null)
                namedArgs[i++] = new CustomAttributeNamedArgument(type.GetField("MarshalTypeRef"), marshalAs.MarshalTypeRef);
            if (marshalAs.MarshalCookie != null)
                namedArgs[i++] = new CustomAttributeNamedArgument(type.GetField("MarshalCookie"), marshalAs.MarshalCookie);

            m_namedArgs = Array.AsReadOnly(namedArgs);
        }
        private void Init(object pca)