gridview自定义分页

     gridview里虽然有自动分页的功能，但是我们其实经常感觉不是很完善，比如，他没有页面直接跳转的功能，就是输入页数，然后跳转。还有他也没有显示记录的条数。其实，这些信息有时候是非常重要的。因此我们非常有必要实现这个功能。下面，我就讲述下如何实现自定义分页的。
一、首先要将gridview设置成可以分页，然后我们在增加如下代码：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Width="98%" AllowPaging="True" OnPageIndexChanging="GridView1_PageIndexChanging" PageSize="20">
                        <Columns>
                            <asp:BoundField DataField="UserName" HeaderText="登陆用户名" >
                                <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:BoundField>
                            <asp:BoundField DataField="Name" HeaderText="真实姓名">
                                <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:BoundField>
                            <asp:BoundField DataField="PostName" HeaderText="职位" >
                             <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:BoundField>
                            <asp:BoundField DataField="OrgName" HeaderText="组织" >
                             <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:BoundField>
                            <asp:BoundField DataField="RoleName" HeaderText="角色" >
                             <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:BoundField>
                            <asp:BoundField DataField="StateStr" HeaderText="当前状态" >
                             <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:BoundField>
                            <asp:TemplateField HeaderText="操作">
                                <ItemTemplate>
                                    <asp:LinkButton ID="LinkButtonEdit" runat="server" CommandArgument='<%# Eval("UserID") %>' OnClick="LinkButtonEdit_Click">编辑</asp:LinkButton>
                                    &nbsp;
                                    <asp:LinkButton ID="LinkButtonDelete" runat="server" CommandArgument='<%# Eval("UserID") %>' OnClick="LinkButtonDelete_Click">删除</asp:LinkButton>
                                </ItemTemplate>
                                 <ItemStyle CssClass="griditem" />
                                <HeaderStyle CssClass="gridhead" />
                            </asp:TemplateField>
                        </Columns>
                         <EmptyDataTemplate>
                            <table  border='0' cellpadding='0' cellspacing='0' style='border-right: coral 1px dotted;border-top: coral 1px dotted; border-left: coral 1px dotted; border-bottom: coral 1px dotted;background-color: #ffffff;200px;height:55px;'><tr><td align='center' style="height: 53px"><font color='coral'><b>没有任何数据<b></font></B></B></td></tr></table>
                        </EmptyDataTemplate>
                        <PagerTemplate>
                            <table border="0" cellpadding="0" cellspacing="0" style=" 99%; height: 15px">
                                <tr>
                                    <td style=" 100px; height: 13px">
                                        </td>
                                    <td style=" 100px; height: 13px">
                                        <div style=" 286px; height: 7px; font-size:12px;">                                          
                                                        总共                                                 
                                                    <%=RecordCount%>                                                   
                                                        条记录 当前第                                                  
                                                        <%#((GridView)Container.NamingContainer).PageIndex+1%>/<%#((GridView)Container.NamingContainer).PageCount %>
                                                        页
                                             
                                        </div>
                                    </td>
                                    <td style=" 100px; height: 13px">
                                        <div style=" 252px; height: 8px; text-align: right">
                                            <asp:LinkButton ID="FirstPage" runat="server" CommandArgument="First" CommandName="Page"  Enable="<%# ((GridView)Container.NamingContainer).PageIndex != 0 %>">第一页</asp:LinkButton>                                           
                                            <asp:LinkButton ID="PreviousPage" runat="server" CommandArgument="Prev" CommandName="Page" Enable="<%# ((GridView)Container.NamingContainer).PageIndex != 0 %>">上一页</asp:LinkButton>
                                             <asp:LinkButton ID="NextPage" runat="server" CommandArgument="Next" CommandName="Page" Enable="<%# ((GridView)Container.NamingContainer).PageIndex != ((GridView)Container.NamingContainer).PageCount - 1 %>">下一页</asp:LinkButton>
                                            <asp:LinkButton ID="LastPage" runat="server" CommandArgument="Last" CommandName="Page" Enable="<%# ((GridView)Container.NamingContainer).PageIndex != ((GridView)Container.NamingContainer).PageCount - 1 %>">最后一页</asp:LinkButton>
                                            <asp:TextBox ID="TextGotoPage" runat="server" CssClass="pageeditbox"></asp:TextBox>
                                            <asp:Button ID="PageGo" causesvalidation="False" commandargument="-1" commandname="Page" runat="server" CssClass="pagebutton" Text="Go" />
                                        </div>
                                    </td>
                                    <td style=" 100px; height: 13px">
                                        <div style=" 266px; height: 1px">
                                        </div>
                                    </td>
                                </tr>
                            </table>
                        </PagerTemplate>       
                    </asp:GridView>

红色的部分就是自定义的分页代码，其实LinkButton里的CommandArgument参数就是gridview的当前页，CommandName表示触发的命令，这些都不能改。
注意里面有个RecordCount的变量，他是public类型，是从后台传过来的，表示记录的条数，测试的时候别忘了这个变量啊。

二、分页的代码

 protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        SetGridPage(sender, e,DtSource)
     }

SetGridPage的函数

/**//// <summary>
    /// 分页处理
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    /// <param name="dt"></param>
    public void SetGridPage(object sender, GridViewPageEventArgs e,DataTable dt)
    {
        GridView theGrid = (GridView)sender; // refer to the GridView
        int newPageIndex = 0;        
        GridViewRow pagerRow = theGrid.BottomPagerRow;
        //GridViewRow pagerRow = theGrid.Controls[0].Controls[theGrid.Controls[0].Controls.Count - 1] as GridViewRow; // refer to PagerTemplate
        //GridView较DataGrid提供了更多的API，获取分页块可以使用BottomPagerRow 或者TopPagerRow，当然还增加了HeaderRow和FooterRow
        if (-2 == e.NewPageIndex)//点击按钮的事件
        { 
            TextBox txtNewPageIndex = null;                        
            if (null != pagerRow)
            {
                txtNewPageIndex = (TextBox)pagerRow.FindControl("TextGotoPage");   // refer to the TextBox with the NewPageIndex value
            }
            if (null != txtNewPageIndex && txtNewPageIndex .Text !="")
            {
                newPageIndex = int.Parse(txtNewPageIndex.Text) - 1; // get the NewPageIndex                
            }
            else
            {
                newPageIndex = 0;
            }
        }
        else
        { 
            //当点击分页连接的时候
            newPageIndex = e.NewPageIndex;
        }
        // 处理超出范围的分页
        newPageIndex = newPageIndex < 0 ? 0 : newPageIndex;
        newPageIndex = newPageIndex >= theGrid.PageCount ? theGrid.PageCount - 1 : newPageIndex;
        
        ((TextBox)pagerRow.FindControl("TextGotoPage")).Text = Convert.ToString(newPageIndex + 1);
        //帮定数据源
        theGrid.PageIndex = newPageIndex;
        theGrid.DataSource = dt;        
          theGrid.DataBind();        
    }