CSDataBase.cJSONDataReader.getType C# (CSharp) Метод

        private Type getType(string typeName, string columnName)
        {
            Type type;

            switch (typeName.ToLower())
            {
                case "integer":
                case "int2":
                case "int4":
                case "smallint":
                    type = typeof(int);
                    break;
                case "biginteger":
                case "serial":
                case "bigserial":
                    type = typeof(Int64);
                    break;
                case "decimal":
                case "numeric":
                case "float8":
                case "float4":
                case "real":
                    type = typeof(double);
                    break;
                case "timestamp":
                case "timestamptz":
                case "date":
                case "time":
                    type = typeof(DateTime);
                    break;
                case "character":
                case "char":
                case "varchar":
                case "text":
                case "character varying":
                    type = typeof(string);
                    break;
                case "bytea":
                    type = typeof(byte[]);
                    break;
                default:
                    throw new ArgumentException("The data type for column " + columnName + " of data source " + m_dataSource.getName() + " is not supported");
            }
            return type;
        }