System.Data.FunctionNode.GetDataType C# (CSharp) Метод

        private Type GetDataType(ExpressionNode node)
        {
            Type nodeType = node.GetType();
            string typeName = null;

            if (nodeType == typeof(NameNode))
            {
                typeName = ((NameNode)node)._name;
            }
            if (nodeType == typeof(ConstNode))
            {
                typeName = ((ConstNode)node)._val.ToString();
            }

            if (typeName == null)
            {
                throw ExprException.ArgumentType(s_funcs[_info]._name, 2, typeof(Type));
            }

            Type dataType = Type.GetType(typeName);

            if (dataType == null)
            {
                throw ExprException.InvalidType(typeName);
            }

            return dataType;
        }