参考了:http://www.jb51.net/article/35110.htm
改进的地方:
1、ashx返回json数据,减少传输数据量,html页面样式控制也比较灵活;
2、改写html页的jQuery代码;
3、把3个ashx文件简化为1个。
一、创建表的测试数据:
create table test(id int identity,title varchar(36))
declare @index int;
set @index = 1;
while(@index begin
insert test(title) values (newid())
set @index = @index + 1
end
二、.html页
三、.ashx页
public class Handler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
StringBuilder tb = new StringBuilder();
DataBase db = new DataBase();
int pageSize = 10;
int pageIndex = 0;
string type = context.Request.Params["type"];
switch (type)
{
case "first":
DataTable dt1 = db.GetDataSet("select top 10 * from test", null).Tables[0];
tb.Append(Common.DataTableToJSON(dt1, true)); //DataTable转为JSON
break;
case "next":
pageIndex = Convert.ToInt32(context.Request.Params["index"]);
DataTable dt2 = db.GetDataSet("select top " + pageSize.ToString() + " * from test where id> (select max(id) from (select top " + (pageSize * pageIndex).ToString() + " id from test) t)", null).Tables[0];
tb.Append(Common.DataTableToJSON(dt2, true));
break;
case "pre":
pageIndex = Convert.ToInt32(context.Request.Params["index"]);
DataTable dt3 = db.GetDataSet("select top " + pageSize.ToString() + " * from test where id> (select max(id) from (select top " + (pageSize * pageIndex).ToString() + " id from test) t)", null).Tables[0];
tb.Append(JSONHelper.DataTableToJSON(dt));
break;
}
context.Response.Write(tb.ToString());
}
public bool IsReusable
{
get
{
return false;
}
}
}
四、效果
--------------------------------------------------------------------------------------------------------------------
备注 (2010-7-10):
用sql2005 row_number()分页方法,.ashx页面代码可简化为
public class Handler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
DataBase db = new DataBase();
int pageSize = 10;
int pageIndex = 0;
int.TryParse(context.Request.Params["index"], out pageIndex);
string type = context.Request.Params["type"];
string sql = string.Format("select * from ( select row_number() over (order by id) as rowNum,* from test) as t "
+ " where rowNum>{0} and rowNumDataTable dt = db.GetDataSet(sql, null).Tables[0];
context.Response.Write(JSONHelper.DataTableToJSON(dt));
}
public bool IsReusable
{
get
{
return false;
}
}
}
备注:
其中JSONHelper.DataTableToJSON(dt)方法为DataTable解析成JSON,见另一篇文章
JSONHelper帮助类
Statement:The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn