🚀增加分页模型分页及示例

Examples/restful/PagingInfo.cs

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+using FreeSql.Internal.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace restful
+{
+    public class PagingInfo : BasePagingInfo
+    {
+        /// <summary>
+        /// 无参构造函数
+        /// </summary>
+        public PagingInfo()
+        {
+        }
+        /// <summary>
+        /// 当前为第1页，每页大小的构造函数
+        /// </summary>
+        /// <param name="pageSize"></param>
+        public PagingInfo(int pageSize)
+        {
+            PageNumber = 1;
+            PageSize = pageSize;
+        }
+        /// <summary>
+        /// 带当前页和每页大小的构造函数
+        /// </summary>
+        /// <param name="pageNumber"></param>
+        /// <param name="pageSize"></param>
+        public PagingInfo(int pageNumber, int pageSize)
+        {
+            PageNumber = pageNumber;
+            PageSize = pageSize;
+        }
+        /// <summary>
+        /// 当前有多少页【只读】
+        /// </summary>
+        public long PageCount => PageSize == 0 ? 0 : (Count + PageSize - 1) / PageSize;
+        /// <summary>
+        /// 是否有上一页【只读】
+        /// </summary>
+        public bool HasPrevious => PageNumber > 1 && PageNumber <= PageCount;
+        /// <summary>
+        /// 是否有下一页【只读】
+        /// </summary>
+        public bool HasNext => PageNumber < PageCount;
+        /// <summary>
+        /// 是否在第一页【只读】
+        /// </summary>
+        public bool IsFrist => PageNumber == 1;
+        /// <summary>
+        /// 是否在最后一页【只读】
+        /// </summary>
+        public bool IsLast => PageNumber == PageCount;
+    }
+}