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.NET分页控件简单学习

2024-07-10 12:54:18
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在ASP的开发技术中.NET提供了许多实用的控件,其实分页控件可以很好地实现了分页功能,接下来错新技术频道小编就给大家介绍.NET分页控件简单学习,希望对你有所帮助。

using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Data.Common;using System.Data.SqlClient;using System.Linq;using System.Web;namespace page.DAL{  public class PageDal  {    public DataTable GetUserList(out int totalCount, int pageIndex = 1, int pagesize = 10)    {      using (        SqlConnection coon =          new SqlConnection(ConfigurationManager.ConnectionStrings["userConnection"].ConnectionString))      {        coon.Open();        string sqlCount = "select count(F_Id) from Sys_User";        SqlCommand cmd = new SqlCommand(sqlCount, coon);        totalCount = int.Parse(cmd.ExecuteScalar().ToString());        string sql = "select F_Account,F_RealName from (select *,Row_Number() over(order by F_Account) r from Sys_User)as w where r>{0} and r<={1};";        SqlDataAdapter ad = new SqlDataAdapter(String.Format(sql, (pageIndex - 1) * pagesize, (pageIndex * pagesize)), coon);        DataTable dt = new DataTable();        ad.Fill(dt);        return dt;      }    }  }} 

然后记得修改一下webconfig里面的连接数据库的字符串,数据库自己随便建一个就行。

接下来是ashx一般处理程序,html页面把需求传过来,他在从PageDal中取数据。 

 

using page.DAL;using System;using System.Collections.Generic;using System.Data;using System.Linq;using System.Text;using System.Web;namespace page{  /// <summary>  /// WebHandler 的摘要说明  /// </summary>  public class WebHandler : IHttpHandler  {    public void ProcessRequest(HttpContext context)    {      try      {        int pageIndex = int.Parse(context.Request.Form["pageindex"]);        int pageSize = int.Parse(context.Request.Form["pagesize"]);        PageDal pd = new PageDal();        int totalCount;        DataTable dt = pd.GetUserList(out totalCount, pageIndex, pageSize);        string json = ToJson(dt, "data", totalCount);        context.Response.ContentType = "text/plain";        context.Response.Write(json);      }      catch      {        context.Response.Write("error");      }    }    public bool IsReusable    {      get      {        return false;      }    }    /// <summary>    /// DataTable转换为Json    /// </summary>    public static string ToJson(DataTable dt, string jsonName, int count)    {      StringBuilder Json = new StringBuilder();      if (string.IsNullOrEmpty(jsonName))        jsonName = dt.TableName;      Json.Append("{/"" + jsonName + "/":[");      if (dt.Rows.Count > 0)      {        for (int i = 0; i < dt.Rows.Count; i++)        {          Json.Append("{");          for (int j = 0; j < dt.Columns.Count; j++)          {            Type type = dt.Rows[i][j].GetType();            Json.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":" + StringFormat(dt.Rows[i][j].ToString(), type));            if (j < dt.Columns.Count - 1)            {              Json.Append(",");            }          }          Json.Append("}");          if (i < dt.Rows.Count - 1)          {            Json.Append(",");          }        }      }      Json.Append("],");      Json.Append("/"count/":" + count + "}");      return Json.ToString();    }    /// <summary>    /// 格式化字符型、日期型、布尔型    /// </summary>    /// <param name="str"></param>    /// <param name="type"></param>    /// <returns></returns>    private static string StringFormat(string str, Type type)    {      if (type == typeof(string))      {        str = String2Json(str);        str = "/"" + str + "/"";      }      else if (type == typeof(DateTime))      {        str = "/"" + str + "/"";      }      else if (type == typeof(bool))      {        str = str.ToLower();      }      else if (type != typeof(string) && string.IsNullOrEmpty(str))      {        str = "/"" + str + "/"";      }      return str;    }    /// <summary>    /// 过滤特殊字符    /// </summary>    /// <param name="s">字符串</param>    /// <returns>json字符串</returns>    private static string String2Json(String s)    {      StringBuilder sb = new StringBuilder();      for (int i = 0; i < s.Length; i++)      {        char c = s.ToCharArray()[i];        switch (c)        {          case '/"':            sb.Append("///""); break;          case '//':            sb.Append("////"); break;          case '/':            sb.Append("///"); break;          case '/b':            sb.Append("//b"); break;          case '/f':            sb.Append("//f"); break;          case '/n':            sb.Append("//n"); break;          case '/r':            sb.Append("//r"); break;          case '/t':            sb.Append("//t"); break;          default:            sb.Append(c); break;        }      }      return sb.ToString();    }  }} 

最后就是html代码了 

 

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  <script src="../Content/jquery/jquery-1.11.1.min.js"></script>  <title></title></head><body>  <table id="datatable"></table>  <div id="pageination" style="width: 100%">    <a href="javascript:void(0);" onclick="GoFirst()">首页</a> <a href="javascript:void(0);" onclick="GoPre()">上一页</a>  <span>当前<input id="pageindex" type="text" style="width:20px" value="1" disabled="disabled" />页,总共<input id="totalcount" type="text" style="width:20px" value="" disabled="disabled" />条数据,共<input id="pagecount" type="text" style="width:20px" value="" disabled="disabled" />页</span>  <a href="javascript:void(0);" onclick="GoNext()">下一页</a> <a href="javascript:void(0);" onclick="GoLast()">尾页</a>  </div></body></html><script>  var pageindex = 1;  var pagesize = 15;  $(function () {    search();  });  function search() {    $.ajax({      url: "../WebHandler.ashx",      type: "post",      data: {        "pagesize": pagesize,        "pageindex": pageindex      },      success: function (daa) {        var json = JSON.parse(daa);        var tab = $("#datatable");        tab.empty();        for (var i = 0; i < json.data.length ; i++) {          tab.append("<tr><td>" +            json.data[i].F_Account +            "</td><td>" +            json.data[i].F_RealName +            "</td></tr>");        }        var count = json.count;        var pagecount = Math.ceil(count / pagesize);        $("#totalcount").val(count);        $("#pagecount").val(pagecount);      }    });  };  function GoFirst() {    pageindex = 1;    $("#pageindex").val(pageindex);    search();  };  function GoLast() {    var pageindex = $("#pagecount").val();    $("#pageindex").val(pageindex);    search();  };  function GoPre() {    if (pageindex > 1) {      pageindex = pageindex - 1;      $("#pageindex").val(pageindex);      search();    } else {      alert("这是第一页!");    }  };  function GoNext() {    var pagecount = $("#pagecount").val();    if (pageindex < pagecount) {      pageindex = pageindex + 1;      $("#pageindex").val(pageindex);      search();    } else {      alert("这是最后一页!");    }  };</script> 

看完那篇帖子自己又对照的看了一下公司做的分页,总结了一下,以前都没认真想过关于分页的东西,觉得还挺难的,但经过一次总结发现其实只要你按顺序一点一点理清楚,有一个清晰的思路,完全不难的。 

首先取数据,分两个部分,一个是把所有的数据个数统计出来另一个是取当前页码的数据,这个是很简单的,自己把有关的sql语句写好就行,sql语句的写法有很多,我取当前页码用的语句是 

select F_Account,F_RealName from (select *,Row_Number() over(order by F_Account) r from Sys_User)as w where r> (pageIndex - 1) * pagesize and r<=pageIndex* pagesize
数据取出来之后就是把页面栏拼好,并且把相关的方法写好,比如说首页,前一页,下一页,尾页等,之后把数据总数传过来,计算页数就OK了。 

<div id="pageination" style="width: 100%">    <a href="javascript:void(0);" onclick="GoFirst()">首页</a> <a href="javascript:void(0);" onclick="GoPre()">上一页</a>  <span>当前<input id="pageindex" type="text" style="width:20px" value="1" disabled="disabled" />页,总共<input id="totalcount" type="text" style="width:20px" value="" disabled="disabled" />条数据,共<input id="pagecount" type="text" style="width:20px" value="" disabled="disabled" />页</span>  <a href="javascript:void(0);" onclick="GoNext()">下一页</a> <a href="javascript:void(0);" onclick="GoLast()">尾页</a>  </div>function GoFirst() {    pageindex = 1;    $("#pageindex").val(pageindex);    search();  };  function GoLast() {    var pageindex = $("#pagecount").val();    $("#pageindex").val(pageindex);    search();  };  function GoPre() {    if (pageindex > 1) {      pageindex = pageindex - 1;      $("#pageindex").val(pageindex);      search();    } else {      alert("这是第一页!");    }  };  function GoNext() {    var pagecount = $("#pagecount").val();    if (pageindex < pagecount) {      pageindex = pageindex + 1;      $("#pageindex").val(pageindex);      search();    } else {      alert("这是最后一页!");    }  };

以上就是错新技术频道小编为各位朋友们整理的.NET分页控件简单学习,小编提醒大家,对于学习都要谨慎认真对待,这样才能在这行越走越远。

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