ListView 无 DataSource 依然用 DataPager 翻页

ListView 有 DataSource 使用 DataPager 翻页
ListView 无 DataSource 使用 DataPager 翻页
问题描述
点击两次才能翻页
返回上一页,内容为空
解决方法

ListView 有 DataSource 使用 DataPager 翻页

---

ListView有DataSource时，直接在 itemPlaceholder后面放一个DataPager即可翻页。

<asp:LinqDataSource ID="LinqDataSourceSoftware" runat="server" ContextTypeName="DataClassesDataContext" EntityTypeName="" OrderBy="SoftwareName desc" TableName="Softwares"></asp:LinqDataSource>
<asp:ListView ID="ListViewSoftwares" runat="server"
     DataSourceID="LinqDataSourceSoftware"    
     OnItemCommand="ListViewSoftwares_ItemCommand">
    <LayoutTemplate>
        <table cellpadding="2" runat="server" id="tblSoftLibrary" cellspacing="0" class="ListView">
            <tr runat="server">
                <th runat="server" style="50%;"></th>
                <th runat="server" style="50%;"></th>
            </tr>
            <tr runat="server" id="itemPlaceholder"/>
            <tr runat="server">
                <td colspan="5">
                    <asp:DataPager runat="server" ID="DataPagerSoftwares"
                        PagedControlID="ListViewSoftwares"
                        PageSize="10"
                        Class="ListViewPager" >
                        <Fields>
                            <asp:NextPreviousPagerField
                                ShowFirstPageButton="true"
                                FirstPageText="<<"
                                ShowNextPageButton="false"
                                ShowPreviousPageButton="false"/>
                            <asp:NumericPagerField  ButtonCount="3" />
                            <asp:NextPreviousPagerField
                                ShowLastPageButton="true"
                                LastPageText=">>"
                                ShowNextPageButton="false"
                                ShowPreviousPageButton="false"/>
                        </Fields>
                    </asp:DataPager>
                </td>
            </tr>
        </table>
    </LayoutTemplate>
    <ItemTemplate>
        <tr runat="server" >
            <td>
                <asp:Image ID="Image1" runat="server" ImageUrl='<%# ImagePathPrefix+Eval("ImagePath").ToString() %>' />
            </td>
            <td>
                  <asp:Label ID="LabelName" runat="server" Text='<%#Eval("SoftwareName") %>' Font-Bold="true"/>
            </td>
        </tr>
    </ItemTemplate>
</asp:ListView>

ListView 无 DataSource 使用 DataPager 翻页

---

ListView无DataSource时，直接使用DataPager翻页，将会遇到以下问题

问题描述

点击两次才能翻页

翻页按钮点击一次后不会有任何反应，直到第二次点击后才翻页

返回上一页,内容为空

往前翻页，内容为空

而且翻页后的内容也是错的，第二页依然显示的是第一页开头几项

解决方法

这个问题的原因是DataPager找不到当前ListView的PageChangingProperty，所以我们得手动添加OnPagePropertiesChanging事件
OnPagePropertiesChanging

<asp:ListView ID="ListViewSoftwares" runat="server"
     DataSourceID="LinqDataSourceSoftware"   
     OnItemCommand="ListViewSoftwares_ItemCommand"
     OnPagePropertiesChanging="ListViewSoftwares_OnPagePropertiesChanging">

    protected void ListViewSoftwares_OnPagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
    {
        //set current page startindex, max rows and rebind to false
        DataPagerSoftwares.SetPageProperties(e.StartRowIndex, e.MaximumRows, false);
        //rebind ListView
        BindListViewSoftwares();
    }
    protected void BindListViewSoftwares()
    {
        DataClassesDataContext da = new DataClassesDataContext();
        var softwares = from s in da.EMS_Softwares
                        select s;
        ListViewSoftwares.DataSource = softwares;
        ListViewSoftwares.DataBind();
    }

而且为了后台设置 DataPager 控件属性，我们得把DataPager控件挪出ListView

<asp:ListView ID="ListViewSoftwares" runat="server"  
     OnItemCommand="ListViewSoftwares_ItemCommand"
     OnPagePropertiesChanging="ListViewSoftwares_OnPagePropertiesChanging">
    <LayoutTemplate>
        <table cellpadding="2" runat="server" id="tblSoftLibrary" cellspacing="0" class="ListView">
            <tr runat="server">
                <th runat="server" style="50%;"></th>
                <th runat="server" style="50%;"></th>
            </tr>
            <tr runat="server" id="itemPlaceholder"/>
        </table>
    </LayoutTemplate>
    <ItemTemplate>
        <tr runat="server" >
            <td>
                <asp:Image ID="Image1" runat="server" ImageUrl='<%# ImagePathPrefix+Eval("ImagePath").ToString() %>' />
            </td>
            <td>
                  <asp:Label ID="LabelName" runat="server" Text='<%#Eval("SoftwareName") %>' Font-Bold="true"/>
            </td>
        </tr>
    </ItemTemplate>
</asp:ListView>
<tr runat="server">
    <td colspan="5">
        <asp:DataPager runat="server" ID="DataPagerSoftwares"
            PagedControlID="ListViewSoftwares"
            PageSize="10"
            Class="ListViewPager" >
            <Fields>
                <asp:NextPreviousPagerField
                    ShowFirstPageButton="true"
                    FirstPageText="<<"
                    ShowNextPageButton="false"
                    ShowPreviousPageButton="false"/>
                <asp:NumericPagerField  ButtonCount="3" />
                <asp:NextPreviousPagerField
                    ShowLastPageButton="true"
                    LastPageText=">>"
                    ShowNextPageButton="false"
                    ShowPreviousPageButton="false"/>
            </Fields>
        </asp:DataPager>
    </td>
</tr>

参考链接：http://weblogs.asp.net/hajan/paging-listview-using-datapager-without-using-datasource-control