复制代码 代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxJson.aspx.cs" Inherits="AjaxJson" %>



   
   
   
   

   
   
   

   

   
       
           
           
           
       
   

编号	姓名	性别

   

   

   

复制代码 代码如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Net;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class AjaxJson : System.Web.UI.Page
{
    public string pageCount = string.Empty; //总条目数

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string url = "/SupplyAJAX.aspx";
            string strResult = GetRequestJsonString(url, "type=getcount");
            pageCount = strResult.ToString();
        }
    }

    #region 后台获取ashx返回的数据
    ///

    /// 后台获取ashx返回的数据
    ///

    /// 地址
    /// 参数
    ///
    public static string GetRequestJsonString(string relativePath, string data)
    {
        string requestUrl = GetRequestUrl(relativePath, data);

        try
        {
            WebRequest request = WebRequest.Create(requestUrl);
            request.Method = "GET";

            StreamReader jsonStream = new StreamReader(request.GetResponse().GetResponseStream());
            string jsonObject = jsonStream.ReadToEnd();

            return jsonObject;
        }
        catch
        {
            return string.Empty;
        }
    }

    public static string GetRequestUrl(string relativePath, string data)
    {
        string absolutePath = HttpContext.Current.Request.Url.AbsoluteUri;
        string hostNameAndPort = HttpContext.Current.Request.Url.Authority;
        string applicationDir = HttpContext.Current.Request.ApplicationPath;
        StringBuilder sbRequestUrl = new StringBuilder();
        sbRequestUrl.Append(absolutePath.Substring(0, absolutePath.IndexOf(hostNameAndPort)));
        sbRequestUrl.Append(hostNameAndPort);
        sbRequestUrl.Append(applicationDir);
        sbRequestUrl.Append(relativePath);
        if (!string.IsNullOrEmpty(data))
        {
            sbRequestUrl.Append("?");
            sbRequestUrl.Append(data);
        }
        return sbRequestUrl.ToString();
    }
    #endregion
}

复制代码 代码如下:

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 StudentList = new List();
    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 list = new List();
                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

    ///

 
    /// 对DataTable进行分页,起始页为1 
    ///

 
    ///  
    ///  
    ///  
    ///  
    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; 
    } 

    ///

 
    /// 获取总页数 
    ///

 
    /// 结果集数量 
    /// 页面数量 
    ///  
    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;
    } 
}