Jquery结合Ajax和Web服务使用三层架构实现无刷新分页

/// <summary>
/// WebService1 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{

[WebMethod]
public string HelloWorld()
{
return "Hello World";
}
[WebMethod]
public List<Model.T_Student> GetListAjax(int pageindex,int pagesize) {
BLL.T_Student bll = new BLL.T_Student();
int count= bll.GetRecordCount("");
DataTable dt = bll.GetListDataTable(pageindex, pagesize);
List<Model.T_Student> li = new List<Model.T_Student>();
string name = "";
int age;
string gender = "";
foreach (DataRow row in dt.Rows)
{
name = row["sName"].ToString();
age =Convert.ToInt32(row["sAge"]);
gender = row["sGender"].ToString();
Model.T_Student model = new Model.T_Student();
model.sName = name;
model.sAge = age;
model.sGender = gender;
li.Add(model);
}
return li;
}
[WebMethod]
public int GetLastPageindex(int pagesize)
{
BLL.T_Student bnews = new BLL.T_Student();
int totalcount = bnews.GetRecordCount("");
if (totalcount % pagesize == 0)
{
return totalcount / pagesize;
}
else
{
return totalcount / pagesize + 1;
}
}
}

<script src="jquery/Jquery1.7.js" type="text/javascript"></script>
<script type="text/javascript">

$(function () {
var pagesize = 6;
var pageindex = 1;
var lastindex = 1;

function loaddata() {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetListAjax",
data: "{pageindex:" + pageindex + ",pagesize:" + pagesize + "}",
success: function (result) {
//                        if (result.d.length % pagesize == 0) {
//                            lastindex = result.d.length / pagesize;
//                        }
//                        else {
//                            lastindex = result.d.length / pagesize + 1;
//                        }
var biaoqian = "<table>";
biaoqian += "<tr><td>姓名</td><td>性别</td><td>年龄</td></tr>";

for (var i = 0; i < result.d.length; i++) {
biaoqian += "<tr>";
biaoqian += "<td>" + result.d[i]["sName"] + "</td>";
biaoqian += "<td>" + result.d[i]["sGender"] + "</td>";
biaoqian += "<td>" + result.d[i]["sAge"] + "</td>";
biaoqian += "</tr>";
}
biaoqian += "</table>";
$('#divtable').html(biaoqian);
}
})
}
function aaa() {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetLastPageindex",
data: "{pagesize:" + pagesize + "}",
success: function (result) {
lastindex = result.d;
//alert(lastindex);
}
})
}
loaddata();
aaa();
$("a:eq(0)").click(function () {
pageindex = 1;
loaddata();
})
$("a:eq(1)").click(function () {
if (pageindex > 1) {
pageindex--;
loaddata();
}
})
$("a:eq(2)").click(function () {
if (pageindex < lastindex) {
pageindex++;
loaddata();
}
})
$("a:eq(3)").click(function () {
pageindex = lastindex;
loaddata();
})
})
</script>

<div id="divtable"></div>
<div><a href="#">第一页</a><a href="#">上一页</a><a href="#">下一页</a><a href="#">最后一页</a><input
id="txtPageindex" type="text" /><a href="#">Go</a></div>

private readonly 分页一小时内完成.SQLServerDAL.T_Student dal = new SQLServerDAL.T_Student();
public T_Student()
{}
public DataTable GetListDataTable(int PageIndex, int PageSize) {
return dal.GetListDataTable(PageSize, PageIndex);
}

public DataTable GetListDataTable(int PageSize, int PageIndex)
{
SqlParameter[] parameters = {
new SqlParameter("@sindex", SqlDbType.Int),
new SqlParameter("@ssize", SqlDbType.Int),
};
parameters[0].Value = PageIndex;
parameters[1].Value = PageSize;
return DbHelperSQL.RunProcedureDataTable("usp_student1", parameters);
}

public static DataTable RunProcedureDataTable(string storedProcName, IDataParameter[] parameters)
{
SqlConnection connection = new SqlConnection(connectionString);
DataTable dt = new DataTable();
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
SqlDataAdapter adapter = new SqlDataAdapter(command);
adapter.Fill(dt);
connection.Close();
return dt;

}