分页的拼接字符串的方法

 /// <param name="tableName">table名称</param>
        /// <param name="keyFieldName">主键字段名称</param>
        /// <param name="currentPageIndex">当前页码</param>
        /// <param name="pageCount">每页显示记录数</param>
        /// <param name="conditionString">限制条件字符串</param>
        /// <returns></returns>
        protected virtual string GetExecutePageingSql(string tableName, string keyFieldName, int currentPageIndex, int pageCount, string conditionString)
        {
            if (string.IsNullOrEmpty(tableName))
            {
                throw new ArgumentNullException("tableName");
            }

            if (string.IsNullOrEmpty(keyFieldName))
            {
                throw new ArgumentNullException("keyFieldName");
            }

            if (currentPageIndex < 0)
            {
                throw new ApplicationException(string.Format(@"currentPageIndex值为:{0}，currentPageIndex必须大于等于1，该值不符合要求。", currentPageIndex));
            }

            if (pageCount < 1)
            {
                throw new ApplicationException(string.Format(@"pageCount值为:{0}，pageCount必须大于等于1，该值不符合要求。", pageCount));
            }

            StringBuilder stringBuilder = new StringBuilder();

            stringBuilder.AppendFormat(@"select top {0} * from {1} where {2} not in(select top {3} {2} from {1}  where 1=1 {4}) {4};select count(*) from {1} where 1=1 {4};",
                pageCounts,
                tableName,
                keyFieldName,
                pageCount * (currentPageIndex - 1),
                conditionString);

            return Convert.ToString(stringBuilder);
        }

1=1可以理解成and