根据DataTable生成建表SQL语句【C#】

美人卷珠帘，深坐蹙蛾眉。

/// <summary>
        /// 根据DataTable,生成建表语句
        /// </summary>
        /// <param name="table"></param>
        /// <param name="tableName"></param>
        /// <returns></returns>
        public static string GetCreateTableSql(DataTable table, string tableName)
        {
            var colList = new List<string>();

            //遍历列，获取字段属性
            foreach (DataColumn col in table.Columns)
            {
                string ty;
                if (Type.GetTypeCode(col.DataType) == TypeCode.String)
                {
                    ty = TypeHelper.ConvertTypeToSqlDbType(col.DataType) + "(255)";
                }
                else if (Type.GetTypeCode(col.DataType) == TypeCode.Decimal)
                {
                    ty = TypeHelper.ConvertTypeToSqlDbType(col.DataType) + "(18,6)";
                }
                else
                {
                    ty = TypeHelper.ConvertTypeToSqlDbType(col.DataType) + "";
                }
                var isautoIn = col.AutoIncrement ? $"IDENTITY({col.AutoIncrementSeed},{col.AutoIncrementStep})" : "";
                var isnull = col.AllowDBNull ? "NULL" : "NOT NULL";
                var colStr = "";
                if (Type.GetTypeCode(col.DataType) == TypeCode.String || Type.GetTypeCode(col.DataType) == TypeCode.Decimal)
                {
                    colStr = $"[{col.ColumnName}] {ty} {isautoIn} {isnull} ";
                }
                else
                {
                    colStr = $"[{col.ColumnName}] [{ty}] {isautoIn} {isnull} ";
                }

                colList.Add(colStr);
            }
            if (tableName == "TMP_BomAndCostDetail")
            {
                colList.Add("[fyearperiod] NVarChar(255)  NULL ");
            }
            //拼接建表sql
            var sql = string.Format(@"/*dialect*/ if object_id('{0}') is not null begin drop table {0} end CREATE TABLE {0}(
                     {1}
                    ) ON [PRIMARY];
                    ", tableName, string.Join(",", colList));

            return sql;
        }