ListView選擇自動分頁時 其實就是添加了一個DataPager分頁控件兩者間存在著嵌套關系《Repeater與ListView》中提到這樣的分頁并不是高效的 因為數(shù)據(jù)源還是返回了所有的數(shù)據(jù) 而非當前頁數(shù)據(jù)
優(yōu)化方案及步驟：
1.改數(shù)據(jù)源EnablePaging屬性為true 【允許分頁】
設置MaximumRowsParameterName="rowIndex"【MSDN解釋：該參數(shù)接受檢索的行數(shù)的值 可以理解為：上一頁的最后一行的下標】
設置StartRowIndexParameterName="pageSize"【MSDN解釋：該參數(shù)接受要檢索的第一行索引的值 可以理解為pageSize 即每頁顯示條數(shù)】
SelectCountMethod="GetTotalRowsCount" 【需要總行數(shù)數(shù)時執(zhí)行的方法即一共有多少條數(shù)據(jù)告訴分頁控件如何顯示】
2、此時數(shù)據(jù)源調(diào)用的原有方法getAllClasses不再滿足要求需要在業(yè)務層中新增一個帶MaximumRowsParameterName及StartRowIndexParameterName參數(shù)名稱的方法 以及GetTotalRowsCount兩個方法
BLL層添加如下：
View Code
public List <MODEL.Classes > getPageListByPage( int pageSize, int rowIndex) { return dal.getPageListByPage(pageSize, rowIndex, false);
}
public int GetTotalRowsCount() {
return dal.GetTotalRowsCount();
}
DAL層添加如下：
View Code
public List <MODEL. Classes> getPageListByPage( int rowIndex, int pageSize, bool isDel) { int rowCount = 0;
int pageCount = 0;
DataTable dt = SqlHelper .getPageListByPage(rowIndex, pageSize, out rowCount, out pageCount, isDel);
if (dt.Rows.Count > 0) {
List <MODEL.Classes > list = new List <MODEL.Classes >();
foreach (DataRow dr in dt.Rows) {
MODEL. Classes model = new MODEL. Classes();
LoadEntityData(model, dr);
list.Add(model);
}
return list;
}
return null ;
}
public int GetTotalRowsCount() {
string sqlstr = "select * from classes where cisdel = 0" ;
return SqlHelper .ExecuteScalar(sqlstr);
}
SqlHelper新增方法如下：
View Code
public static DataTable getPageListByPage( int rowIndex, int pageSize, out int rowCount, out int pageCount, bool isDel) { DataTable dtcalss = new DataTable();
rowCount = 0;
pageCount = 0;
using (SqlConnection sqlcon = new SqlConnection (Connstr)) {
SqlDataAdapter sda = new SqlDataAdapter( "up_GetPageData2" , sqlcon);
SqlParameter [] pars = {
new SqlParameter ( "@LastRowIndex",rowIndex),
new SqlParameter ( "@pgSize",pageSize),
new SqlParameter ( "@rowCount",rowCount),
new SqlParameter ( "@pgCount",pageCount),
new SqlParameter ( "@isDel",isDel),
};
//將兩個輸出參數(shù)的輸出方向指定
pars[2].Direction = ParameterDirection .Output;
pars[3].Direction = ParameterDirection .Output;
//將參數(shù)集合 加入到 查詢命令對象中
sda.SelectCommand.Parameters.AddRange(pars);
//設置 查詢命令類型 為存儲過程
sda.SelectCommand.CommandType = CommandType .StoredProcedure;
//執(zhí)行存儲過程
sda.Fill(dtcalss);
//執(zhí)行完后 將存儲過程 獲得的 兩個輸出參數(shù)值 賦給此方法的兩個輸出參數(shù)
rowCount = Convert .ToInt32(pars[2].Value);
pageCount = Convert .ToInt32(pars[3].Value);
}
return dtcalss;
}
存儲過程up_GetPageData2代碼如下:
View Code
create proc up_GetPageData2
@LastRowIndex int , ---上一頁的最后一行的下標
@pgSize float , --頁容量
@rowCount int output, --- 輸出總行數(shù)
@pgCount int output, --- 輸出 總頁數(shù)
@isDel bit --數(shù)據(jù)是否刪除
as
begin
select @rowCount =count (*) from classes where cisdel= @isDel --查出總行數(shù)
set @pgCount =ceiling ( @rowCount/ @pgSize )-- 算出總頁數(shù)
select * from (
select Row_Number () over ( order by cid ) as RNum, * from classes where cisdel= @isDel
) as temp
where RNum >@LastRowIndex and RNum <= @LastRowIndex +@pgSize
end
ListView.aspx代碼如下：
View Code
<% @ Page Language="C#" AutoEventWireup="true" CodeBehind="ListView.aspx.cs" Inherits ="WebForm.ListView" %>
<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
< html xmlns ="http://www.w3.org/1999/xhtml">
< head runat ="server">
<title ></ title>
</ head>
< body>
<form id="form1" runat="server">
<div >
< asp: ObjectDataSource ID ="ObjectDataSource1" runat ="server"
SelectMethod ="getPageListByPage" TypeName ="BLL.Classes"
DataObjectTypeName ="MODEL.Classes" DeleteMethod ="SoftDel" InsertMethod ="Add"
UpdateMethod ="Modify" EnablePaging ="True"
MaximumRowsParameterName ="rowIndex" SelectCountMethod ="GetTotalRowsCount"
StartRowIndexParameterName ="pageSize">
</ asp: ObjectDataSource >
< asp: ListView ID ="ListView1" runat ="server" DataSourceID ="ObjectDataSource1"
InsertItemPosition ="LastItem">
< AlternatingItemTemplate>
< tr style ="">
< td>
< asp: Button ID ="DeleteButton" runat ="server" CommandName ="Delete" Text ="刪除" />
< asp: Button ID ="EditButton" runat ="server" CommandName ="Edit" Text ="編輯" />
</ td>
< td>
< asp: Label ID ="CIDLabel" runat ="server" Text =' <%# Eval("CID") %> ' />
</ td>
< td>
< asp: Label ID ="CNameLabel" runat ="server" Text =' <%# Eval("CName") %> ' />
</ td>
< td>
< asp: Label ID ="CCountLabel" runat ="server" Text =' <%# Eval("CCount") %> ' />
</ td>
< td>
< asp: Label ID ="CImgLabel" runat ="server" Text =' <%# Eval("CImg") %> ' />
</ td>
< td>
< asp: CheckBox ID ="CIsDelCheckBox" runat ="server"
Checked ='<% # Eval("CIsDel") %> ' Enabled ="false" />
</ td>
< td>
< asp: Label ID ="CAddTimeLabel" runat ="server" Text =' <%# Eval("CAddTime") %> ' />
</ td>
</ tr>
</ AlternatingItemTemplate>
< EditItemTemplate>
< tr style ="">
< td>
< asp: Button ID ="UpdateButton" runat ="server" CommandName ="Update" Text ="更新" />
< asp: Button ID ="CancelButton" runat ="server" CommandName ="Cancel" Text ="取消" />
</ td>
< td>
< asp: TextBox ID ="CIDTextBox" runat ="server" Text =' <%# Bind("CID") %> ' />
</ td>
< td>
< asp: TextBox ID ="CNameTextBox" runat ="server" Text =' <%# Bind("CName") %> ' />
</ td>
< td>
< asp: TextBox ID ="CCountTextBox" runat ="server" Text =' <%# Bind("CCount") %> ' />
</ td>
< td>
< asp: TextBox ID ="CImgTextBox" runat ="server" Text =' <%# Bind("CImg") %> ' />
</ td>
< td>
< asp: CheckBox ID ="CIsDelCheckBox" runat ="server"
Checked ='<% # Bind("CIsDel") %> ' />
</ td>
< td>
< asp: TextBox ID ="CAddTimeTextBox" runat ="server"
Text ='<% # Bind("CAddTime") %> ' />
</ td>
</ tr>
</ EditItemTemplate>
< EmptyDataTemplate>
< table runat ="server"
style ="">
< tr>
< td>
未返回數(shù)據(jù)。 </ td>
</ tr>
</ table>
</ EmptyDataTemplate>
< InsertItemTemplate>
< tr style ="">
< td>
< asp: Button ID ="InsertButton" runat ="server" CommandName ="Insert" Text ="插入" />
< asp: Button ID ="CancelButton" runat ="server" CommandName ="Cancel" Text ="清除" />
</ td>
< td>
< asp: TextBox ID ="CIDTextBox" runat ="server" Text =' <%# Bind("CID") %> ' />
</ td>
< td>
< asp: TextBox ID ="CNameTextBox" runat ="server" Text =' <%# Bind("CName") %> ' />
</ td>
< td>
< asp: TextBox ID ="CCountTextBox" runat ="server" Text =' <%# Bind("CCount") %> ' />
</ td>
< td>
< asp: TextBox ID ="CImgTextBox" runat ="server" Text =' <%# Bind("CImg") %> ' />
</ td>
< td>
< asp: CheckBox ID ="CIsDelCheckBox" runat ="server"
Checked ='<% # Bind("CIsDel") %> ' />
</ td>
< td>
< asp: TextBox ID ="CAddTimeTextBox" runat ="server"
Text ='<% # Bind("CAddTime") %> ' />
</ td>
</ tr>
</ InsertItemTemplate>
< ItemTemplate>
< tr style ="">
< td>
< asp: Button ID ="DeleteButton" runat ="server" CommandName ="Delete" Text ="刪除" />
< asp: Button ID ="EditButton" runat ="server" CommandName ="Edit" Text ="編輯" />
</ td>
< td>
< asp: Label ID ="CIDLabel" runat ="server" Text =' <%# Eval("CID") %> ' />
</ td>
< td>
< asp: Label ID ="CNameLabel" runat ="server" Text =' <%# Eval("CName") %> ' />
</ td>
< td>
< asp: Label ID ="CCountLabel" runat ="server" Text =' <%# Eval("CCount") %> ' />
</ td>
< td>
< asp: Label ID ="CImgLabel" runat ="server" Text =' <%# Eval("CImg") %> ' />
</ td>
< td>
< asp: CheckBox ID ="CIsDelCheckBox" runat ="server"
Checked ='<% # Eval("CIsDel") %> ' Enabled ="false" />
</ td>
< td>
< asp: Label ID ="CAddTimeLabel" runat ="server" Text =' <%# Eval("CAddTime") %> ' />
</ td>
</ tr>
</ ItemTemplate>
< LayoutTemplate>
< table runat ="server">
< tr runat ="server">
< td runat ="server">
< table ID ="itemPlaceholderContainer" runat ="server" border ="0"
style ="">
< tr runat ="server" style ="">
< th runat ="server">
</ th>
< th runat ="server">
CID </ th>
< th runat ="server">
CName </ th>
< th runat ="server">
CCount </ th>
< th runat ="server">
CImg </ th>
< th runat ="server">
CIsDel </ th>
< th runat ="server">
CAddTime </ th>
</ tr>
< tr ID ="itemPlaceholder" runat ="server">
</ tr>
</ table>
</ td>
</ tr>
< tr runat ="server">
< td runat ="server"
style ="">
</ td>
</ tr>
</ table>
</ LayoutTemplate>
< SelectedItemTemplate>
< tr style ="">
< td>
< asp: Button ID ="DeleteButton" runat ="server" CommandName ="Delete" Text ="刪除" />
< asp: Button ID ="EditButton" runat ="server" CommandName ="Edit" Text ="編輯" />
</ td>
< td>
< asp: Label ID ="CIDLabel" runat ="server" Text =' <%# Eval("CID") %> ' />
</ td>
< td>
< asp: Label ID ="CNameLabel" runat ="server" Text =' <%# Eval("CName") %> ' />
</ td>
< td>
< asp: Label ID ="CCountLabel" runat ="server" Text =' <%# Eval("CCount") %> ' />
</ td>
< td>
< asp: Label ID ="CImgLabel" runat ="server" Text =' <%# Eval("CImg") %> ' />
</ td>
< td>
< asp: CheckBox ID ="CIsDelCheckBox" runat ="server"
Checked ='<% # Eval("CIsDel") %> ' Enabled ="false" />
</ td>
< td>
< asp: Label ID ="CAddTimeLabel" runat ="server" Text =' <%# Eval("CAddTime") %> ' />
</ td>
</ tr>
</ SelectedItemTemplate>
</ asp: ListView >
</div >
<asp : DataPager ID ="DataPager1" runat ="server" PagedControlID ="ListView1"
PageSize ="5">
< Fields>
< asp: NextPreviousPagerField ButtonType ="Button" ShowFirstPageButton ="True"
ShowLastPageButton ="True" />
</ Fields>
</asp : DataPager>
</form >
</ body>
</ html>
3、界面中ListView1取消"開啟分頁"自動分頁 拖入分頁控件DataPage并設置PagedControlID="ListView1"使其與ListView1建立關聯(lián)
4、修改數(shù)據(jù)源調(diào)用的方法為getPageListByPage運行結果如下：
補充：
如果運行報錯'ObjectDataSource“ObjectDataSource1”未能找到帶參數(shù)的非泛型方法“getPageListByPage”: pageSize, pageIndex。'
只需刪除aspx界面中
<SelectParameters>
<asp:Parameter DefaultValue="5" Name="pageSize" Type="Int32" />
<asp:Parameter Name="rowIndex" Type="Int32" />
</SelectParameters>
