实现GridView翻页并且实现CheckBox选中功能的保持
在GridView与数据库进行绑定后，由得到的数据记录可能有许多条，以至一个页面无法容纳，这时需要进行多页显。
要实现分页显现，只要使用分页类 "PagedDataSource" 或者只对GridView的AllowPaging属性设为true。即可
一般情况下，如下代码可以实现分页显示。 //使第一种方法：PagedDataSource类加上Linq技术来实现
//页面代码：--------------------------------
<table cellpadding="0" cellspacing="0" class="style2" border="1" style="margin-left: 100px;">
<tr class="style3" style="background-color: #659ACE">
<td colspan="2">
>><span class="style4">创建地址本</span>
<asp:Label ID="lblsuccedd" runat="server" Style="margin-left: 400px" ForeColor="Red"></asp:Label>
</td>
</tr>
<tr class="style3">
<td class="style9">
地址本名称：
</td>
<td class="style8">
<asp:TextBox ID="txtBookName" runat="server" Width="211px"></asp:TextBox>
<asp:Button ID="BtnCreateBook" runat="server" Text="创建" Width="49px" Style="margin-left: 40px;"
OnClick="BtnCreateBook_Click" />
<asp:RequiredFieldValidator ID="RFValiTotxtBookName" runat="server" Display="Dynamic"
ControlToValidate="txtBookName" ErrorMessage="地址本名不能为空！" Style="margin-left: 100px"></asp:RequiredFieldValidator>
</td>
</tr>
<tr class="style3">
<td class="style10">
备注：
</td>
<td class="style6">
<asp:TextBox ID="txtRemark" runat="server" Height="82px" TextMode="MultiLine" Width="213px">这家伙什么也没有留下！</asp:TextBox>
</td>
</tr>
<tr class="style3">
<td class="style10">
选择联系人：
</td>
<td class="style5">
<asp:GridView ID="GVShow" runat="server" AutoGenerateColumns="False" Width="100%"
BackColor="White" BorderColor="White" BorderStyle="Ridge" BorderWidth="2px" CellPadding="3"
CellSpacing="1" GridLines="None" DataKeyNames="Userid" PageSize="5">
<RowStyle BackColor="#DEDFDE" ForeColor="Black" />
<Columns>
<asp:TemplateField ItemStyle-Width="50px" HeaderStyle-Width="50px">
<HeaderTemplate>
<input id="CheckAll" type="checkbox" onclick="CheckBoxAll();" />
</HeaderTemplate>
<ItemTemplate>
<center>
<asp:CheckBox ID="userCheck" runat="server" onclick="ForCheckBox();" />
</center>
</ItemTemplate>
<HeaderStyle Width="50px"></HeaderStyle>
<ItemStyle Width="50px"></ItemStyle>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
登陆名
</HeaderTemplate>
<ItemTemplate>
<%# eval_r("LoginName") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
昵称
</HeaderTemplate>
<ItemTemplate>
<%# eval_r("UserName") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
性别
</HeaderTemplate>
<ItemTemplate>
<%# WebHelp.StrSex(eval_r("UserSex").ToString()) %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
电话
</HeaderTemplate>
<ItemTemplate>
<%# eval_r("UserPhone") %>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
<PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" />
<SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />
<EmptyDataTemplate>
没有任何注册用户信息
</EmptyDataTemplate>
</asp:GridView>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<asp:Button ID="btnPageTop" runat="server" Text="上一页" OnClick="btnPageTop_Click"
CausesValidation="false" />
<asp:Button ID="btnPageDec" runat="server" Text="下一页" OnClick="btnPageDec_Click"
CausesValidation="false" />
<asp:DropDownList ID="drpList" runat="server">
</asp:DropDownList>
<asp:Button ID="btnPages" runat="server" Text="跳转" OnClick="btnPages_Click" CausesValidation="false" />
第<asp:Label ID="lblPageCurrent" runat="server" Text="1"></asp:Label>
页 / 共<asp:Label ID="lblPageCount" runat="server" Text=""></asp:Label>
页
</td>
</tr>
</table>
//底层逻辑--------------------------- //使第一种方法：PagedDataSource类加上Linq技术来实现
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Common_CreateAddressBook : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGridView();
// 注意一定要先 将Session["check"]转换成List<String> 类型
Session["check"] = new List<String>();
}
}
//绑定GridView
private void BindGridView()
{
//Linq To Sql
DataClassesDataContext dc = new DataClassesDataContext();
var dome = from info in dc.Userinfo where info.Roleid == 0 select info;
//分页类
PagedDataSource pds = new PagedDataSource();
//打开分页功能
pds.AllowPaging = true;
//数据源
pds.DataSource = dome.ToList();
//每页显示数据
pds.PageSize = 5;
//当前页
pds.CurrentPageIndex = int.Parse(lblPageCurrent.Text) - 1;
//显示总页数
lblPageCount.Text = pds.PageCount.ToString();
//在下拉列表中添加数据
drpList.Items.Clear();
for (int i = 1; i <= pds.PageCount; i++)
{
drpList.Items.Add(i.ToString());
}
//同步当前页
drpList.SelectedIndex = int.Parse(lblPageCurrent.Text) - 1;
//按钮问题
btnPageTop.Enabled = true;
btnPageDec.Enabled = true;
if (lblPageCurrent.Text == "1")
{
btnPageTop.Enabled = false;
}
if (lblPageCurrent.Text == (pds.PageCount).ToString())
{
btnPageDec.Enabled = false;
}
GVShow.DataSource = pds;
GVShow.DataBind();
SelectCheckBoxKeep();
}
//上一页
protected void btnPageTop_Click(object sender, EventArgs e)
{
PageKeepCheckBox();
lblPageCurrent.Text = (int.Parse(lblPageCurrent.Text) - 1).ToString();
BindGridView();
}
//下一页
protected void btnPageDec_Click(object sender, EventArgs e)
{
PageKeepCheckBox();
lblPageCurrent.Text = (int.Parse(lblPageCurrent.Text) + 1).ToString();
BindGridView();
}
protected void btnPages_Click(object sender, EventArgs e)
{
PageKeepCheckBox();
lblPageCurrent.Text = drpList.Text;
BindGridView();
}
/// <summary>
/// GridView翻页与checkbox保持功能的实现 当点击翻页时保存数据发生
/// </summary>
private void PageKeepCheckBox()
{
List<string> lis = new List<string>();
lis = Session["check"] as List<String>;
string str = "";
//循环GridView中的每一行
foreach (GridViewRow item in GVShow.Rows)
{
//取出DataKeyNames中绑定的数据 （DataKeys是取出DataKeyNames中的数据）
str = (GVShow.DataKeys[item.RowIndex].Value).ToString();
//查找每一行中的CheckBox按钮
CheckBox Check = item.FindControl("userCheck") as CheckBox;
//如果行中的CheckBox被选中，将选中的数据放到List中去
if (Check.Checked)
{
//当List中不包含此数据
if (!lis.Contains(str))
{
lis.Add(str);
}
}
//否则移除
else
{
if (lis.Contains(str))
{
lis.Remove(str);
}
}
}
if (lis != null || lis.Count > 0)
{
Session["check"] = lis;
}
}
/// <summary>
/// 将以前选中的所有项打上标记 在GridView显示之后发生
/// </summary>
private void SelectCheckBoxKeep()
{
int i = 0;
//得到Session["check"]
List<String> lis = Session["check"] as List<String>;
//如果lis中有数据
if (lis != null && lis.Count > 0)
{
foreach (GridViewRow item in GVShow.Rows)
{
i = Convert.ToInt32(GVShow.DataKeys[item.RowIndex].Value);
//如果lis中包含此数据，就设置本行中的CheckBox控件为选中
if (lis.Contains(i.ToString()))
{
CheckBox check = item.FindControl("userCheck") as CheckBox;
check.Checked = true;
}
}
}
}
}
