asp.net - 使用 ListView 进行跨页回发

Question

我有一个源和目标页面。Source.aspx 使用按钮向 Target.aspx 提交搜索。浏览器地址栏通过显示 ResultsTest.aspx?RecipeName=First+Full+Test 来显示回发。如果将标签用作（以下是目标 .cs），则实际搜索也将在标签中发布到目标页面

 protected void Page_Load(object sender, EventArgs e)
    {
        if ((Request.QueryString["RecipeName"] != null))
        {

            Label1.Text = Request.QueryString["RecipeName"].ToString();  

        }

    }

但是，为了进行发布，Label 必须位于页面上的 ListView 之外。ListView 包含我想要为其检索数据的所有字段，并且 Sql Select 的工作原理与我在 Query Builder/Designer 中检查过的一样。如果将Page_Load更改为ListView内部的Label，例如从Label 1变为Label2，则会显示Label在当前上下文中不存在的错误信息。

如何让 ListView 接受回发并检索数据并显示在目标页面上？

编辑：为简洁起见，我从下面的 ListView 中删除了一些字段。但是，关键是，如果我更改 Page_load 以读取“labRecipeName”的标签 ID，则会出现“不在上下文中”错误。如果我将相同的标签放在列表视图的“外部”，则回发会发生并显示在目标页面上。我想要做的是在源页面上创建一个条目并将其回发到目标页面 - 这确实发生了。我无法让 ListView 实际接受查询词并检索数据。

 <asp:ListView ID="ListView1" runat="server" DataKeyNames="RecipeID" DataSourceID="SqlDataSource1">

        <ItemTemplate>
            <tr>
                <td>
                    <asp:HyperLink ID="HyperLink2" runat="server" NavigateUrl='<%#  Bind("RecipeID", "ResultsTest.aspx?RecipeId={0}") %>'
                        Text='<%# Eval("RecipeName") %>'></asp:HyperLink>
                    <asp:Label ID="labRecipeName" runat="server" Text='<%# Eval("RecipeName") %>'></asp:Label>
                </td>
            </tr>
            <tr style="width: 500px">
                <td>

                </td>
            </tr>
        </ItemTemplate>
        <LayoutTemplate>
            &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp<asp:LinkButton
                runat="server" ID="SortByName" CommandName="Sort" CommandArgument="RecipeName">Sort By Recipe Name</asp:LinkButton>
            &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
            <asp:LinkButton runat="server" ID="SortByPrice" CommandName="Sort" CommandArgument="RatingAVG">Sort By Rating</asp:LinkButton>
            <table id="Table1" runat="server">
                <tr id="Tr1" runat="server">
                    <td id="Td1" runat="server">
                        <table id="itemPlaceholderContainer" runat="server" border="0" style="">
                            <tr id="Tr2" runat="server" style="">
                                <th id="Th1" runat="server">
                                </th>
                            </tr>
                            <tr id="itemPlaceholder" runat="server">

                            </tr>
                        </table>
                    </td>
                </tr>
                <tr id="Tr3" runat="server">
                    <td id="Td2" runat="server" style="" align="center">
                        <asp:DataPager ID="DataPager2" PagedControlID="ListView1" PageSize="8" runat="server">
                            <Fields>
                                <asp:NumericPagerField ButtonCount="8" />
                            </Fields>
                        </asp:DataPager>
                    </td>
                </tr>
            </table>
        </LayoutTemplate>
    </asp:ListView>

    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:RecipeUploadConnectionString %>"
        SelectCommand="SELECT pr.RecipeID, pr.CategoryName, pr.CategoryType, pr.RecipeName, pr.Description, COUNT(rr.RecipeID) AS Count, AVG(rr.Rating) 
        AS RatingAVG 
        FROM PostedRecipes AS pr LEFT OUTER JOIN RecipeRatings AS rr ON pr.RecipeID = rr.RecipeID 
        WHERE pr.RecipeName LIKE '%' + @RecipeName + '%' OR pr.CategoryName LIKE '%' + @CategoryName + '%' 
        OR pr.CategoryType LIKE '%' + @CategoryType + '%' OR pr.CuisineOrigin LIKE '%' + @CuisineOrigin + '%' 
        OR pr.CuisineType LIKE '%' + @CuisineType + '%'  GROUP BY pr.RecipeID, pr.RecipeName, pr.CategoryName, pr.CategoryType, pr.CuisineOrigin, 
        pr.CuisineType, pr.Description">
        <SelectParameters>
            <asp:FormParameter FormField="RecipeName" Name="RecipeName" Type="String" />
            <asp:FormParameter FormField="CategoryName" Name="CategoryName" Type="String" />
            <asp:FormParameter FormField="CategoryType" Name="CategoryType" Type="String" />
            <asp:FormParameter FormField="CuisineOrigin" Name="CuisineOrigin" Type="String" />
            <asp:FormParameter FormField="CuisineType" Name="CuisineType" Type="String" />
        </SelectParameters>
    </asp:SqlDataSource>

编辑：

目标页面.cs：

 using System;
 using System.Collections;
 using System.Configuration;
  using System.Data;
 using System.Web;
 using System.Web.Security;
 using System.Web.UI;
 using System.Web.UI.HtmlControls;
 using System.Web.UI.WebControls;
 using System.Web.UI.WebControls.WebParts;
 using System.Data.SqlClient;
 using System.IO;
 using System.Text;
 using System.Web.SessionState;

 namespace RecipeFaire
 {
 public partial class ResultsTest : System.Web.UI.Page
 {
    protected void Page_Load(object sender, EventArgs e)
    {
        if ((Request.QueryString["RecipeName"] != null))
        {

            labRecipeName.Text = Request.QueryString["RecipeName"].ToString();  

        }

    }
   }
 }

源页面.cs：

 using System;
 using System.Configuration;
 using System.Data;
 using System.Web;
 using System.Web.Security;
 using System.Web.UI;
 using System.Web.UI.HtmlControls;
 using System.Web.UI.WebControls;
 using System.Web.UI.WebControls.WebParts;



 namespace RecipeFaire
 {
 public partial class Search : System.Web.UI.Page
 {
    protected void Page_Load(object sender, EventArgs e)
    {


    }

    protected void btnSearch_Click(object sender, EventArgs e)
    {
        string targetURL;

        targetURL = "ResultsTest.aspx?";

        targetURL += "RecipeName=" + Server.UrlEncode(txtRecipeName.Text.Trim());

        Response.Redirect(targetURL);
    }
 }
}

编辑

我需要做的是在 Source.aspx 上的文本框中键入“xxx”，将“xxx”发布到 Target.aspx 作为搜索，并在包含在 Target.aspx 中/上的 ListView 中执行该搜索。根据上述描述，我已验证确实发生了跨页面回发。我已经验证了 Sql Select 查询确实有效。因此，看来我的问题既不在回发中，也不在查询中。但是，对于上面给出的 Target.aspx.cs（将 Label1 更改为 labRecipeName 以符合以下代码除外），当 ListView 的“内部”（作为项目）使用“labRecipeName”时，当通过输入尝试回发时“xxx”，出现错误信息“labRecipeName not in current context”。如果我将“labRecipeName”移到 ListView 之外，但仍在目标上。aspx，错误消息消失，“xxx”在目标页面上显示为文本。我的问题是：如何让“xxx”进入 ListView 中的项目，例如 labRecipeName，以便启动查询并使查询结果出现在 ListView 中？可能我对如何实现这个最终结果有一个完全错误的想法。如果是这样，我将不胜感激任何关于我应该做什么的指导。

    <ItemTemplate>
        <tr>
            <td>
                <asp:HyperLink ID="HyperLink2" runat="server" NavigateUrl='<%#  Bind("RecipeID", "ResultsTest.aspx?RecipeId={0}") %>'
                    Text='<%# Eval("RecipeName") %>'></asp:HyperLink>
                <asp:Label ID="labRecipeName" runat="server" Text='<%# Eval("RecipeName") %>'></asp:Label>
            </td>
        </tr>
        <tr style="width: 500px">
            <td>

            </td>
        </tr>
    </ItemTemplate>
    <LayoutTemplate>
        &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp<asp:LinkButton
            runat="server" ID="SortByName" CommandName="Sort" CommandArgument="RecipeName">Sort By Recipe Name</asp:LinkButton>
        &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
        <asp:LinkButton runat="server" ID="SortByPrice" CommandName="Sort" CommandArgument="RatingAVG">Sort By Rating</asp:LinkButton>
        <table id="Table1" runat="server">
            <tr id="Tr1" runat="server">
                <td id="Td1" runat="server">
                    <table id="itemPlaceholderContainer" runat="server" border="0" style="">
                        <tr id="Tr2" runat="server" style="">
                            <th id="Th1" runat="server">
                            </th>
                        </tr>
                        <tr id="itemPlaceholder" runat="server">

                        </tr>
                    </table>
                </td>
            </tr>
            <tr id="Tr3" runat="server">
                <td id="Td2" runat="server" style="" align="center">
                    <asp:DataPager ID="DataPager2" PagedControlID="ListView1" PageSize="8" runat="server">
                        <Fields>
                            <asp:NumericPagerField ButtonCount="8" />
                        </Fields>
                    </asp:DataPager>
                </td>
            </tr>
        </table>
    </LayoutTemplate>
</asp:ListView>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:RecipeUploadConnectionString %>"
    SelectCommand="SELECT pr.RecipeID, pr.CategoryName, pr.CategoryType, pr.RecipeName, pr.Description, COUNT(rr.RecipeID) AS Count, AVG(rr.Rating) 
    AS RatingAVG 
    FROM PostedRecipes AS pr LEFT OUTER JOIN RecipeRatings AS rr ON pr.RecipeID = rr.RecipeID 
    WHERE pr.RecipeName LIKE '%' + @RecipeName + '%' OR pr.CategoryName LIKE '%' + @CategoryName + '%' 
    OR pr.CategoryType LIKE '%' + @CategoryType + '%' OR pr.CuisineOrigin LIKE '%' + @CuisineOrigin + '%' 
    OR pr.CuisineType LIKE '%' + @CuisineType + '%'  GROUP BY pr.RecipeID, pr.RecipeName, pr.CategoryName, pr.CategoryType, pr.CuisineOrigin, 
    pr.CuisineType, pr.Description">
    <SelectParameters>
        <asp:FormParameter FormField="RecipeName" Name="RecipeName" Type="String" />
        <asp:FormParameter FormField="CategoryName" Name="CategoryName" Type="String" />
        <asp:FormParameter FormField="CategoryType" Name="CategoryType" Type="String" />
        <asp:FormParameter FormField="CuisineOrigin" Name="CuisineOrigin" Type="String" />
        <asp:FormParameter FormField="CuisineType" Name="CuisineType" Type="String" />
    </SelectParameters>
</asp:SqlDataSource>