using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Data; using System.Web.UI; using System.Web.UI.WebControls; //新增   using System.Web.Script.Serialization; using System.Text; public partial class SupplyAJAX : System.Web.UI.Page {     protected static List<Student> StudentList = new List<Student>();     protected static int RecordCount = 0;     protected static DataTable dt = CreateDT();     protected void Page_Load(object sender, EventArgs e)     {         switch (Request["type"])         {             case "show":                 #region 分页配置                 //具体的页面数                 int pageIndex;                 int.TryParse(Request["pageIndex"], out pageIndex);                 //页面显示条数                 int PageSize = Convert.ToInt32(Request["pageSize"]);                 if (pageIndex == 0)                 {                     pageIndex = 1;                 }                 #endregion                 DataTable PagedDT = GetPagedTable(dt, pageIndex, PageSize);                 List<Student> list = new List<Student>();                 foreach (DataRow dr in PagedDT.Rows)                 {                     Student c = new Student();                     c.Id = (Int32)dr["Id"];                     c.Name = dr["Name"].ToString();                     c.Sex = dr["Sex"].ToString();                     list.Add(c);                  }                 string json = new JavaScriptSerializer().Serialize(list);//这个很关键，否则error                 StringBuilder Builder = new StringBuilder();                 Builder.Append("{");                 Builder.Append(""recordcount":" + RecordCount + ",");                 Builder.Append(""data":");                 Builder.Append(json);                 Builder.Append("}");                 Response.ContentType = "application/json";                 Response.Write(Builder.ToString());                 break;             case "getcount":                 Response.Write(dt.Rows.Count);                 break;             case "add":                 break;             case "update":                 break;             case "delete":                 break;         }         Response.End();     }     #region 模拟数据     private static DataTable CreateDT()     {         DataTable dt = new DataTable();         dt.Columns.Add(new DataColumn("Id", typeof(int)) { DefaultValue = 0 });         dt.Columns.Add(new DataColumn("Name", typeof(string)) { DefaultValue = "1" });         dt.Columns.Add(new DataColumn("Sex", typeof(string)) { DefaultValue = "男" });         for (int i = 1; i <= 1000; i++)         {             dt.Rows.Add(i, "张三" + i.ToString().PadLeft(4, '0'));         }         RecordCount = dt.Rows.Count;         return dt;     }     #endregion     /// <summary>      /// 对DataTable进行分页,起始页为1      /// </summary>      /// <param name="dt"></param>      /// <param name="PageIndex"></param>      /// <param name="PageSize"></param>      /// <returns></returns>      public static DataTable GetPagedTable(DataTable dt, int PageIndex, int PageSize)      {          if (PageIndex == 0)              return dt;          DataTable newdt = dt.Copy();          newdt.Clear();            int rowbegin = (PageIndex - 1) * PageSize;          int rowend = PageIndex * PageSize;          if (rowbegin >= dt.Rows.Count)              return newdt;          if (rowend > dt.Rows.Count)              rowend = dt.Rows.Count;          for (int i = rowbegin; i <= rowend - 1; i++)          {              DataRow newdr = newdt.NewRow();              DataRow dr = dt.Rows[i];              foreach (DataColumn column in dt.Columns)              {                  newdr[column.ColumnName] = dr[column.ColumnName];              }              newdt.Rows.Add(newdr);          }          return newdt;      }      /// <summary>      /// 获取总页数      /// </summary>      /// <param name="sumCount">结果集数量</param>      /// <param name="pageSize">页面数量</param>      /// <returns></returns>      public static int getPageCount(int sumCount, int pageSize)      {          int page = sumCount / pageSize;          if (sumCount % pageSize > 0)          {              page = page + 1;          }          return page;      }        public struct Student     {         public int Id;         public string Name;         public string Sex;     }  }