asp.net - 使用中继器，获取 FK 并显示该表中的列

Question

使用中继器，我运行“SelectedUtility”表并输出匹配的位置。 这工作正常，但它显示“Utility_Id”，它是“实用程序表”中“id”的外键。

我实际上想在实用程序表中显示“名称”列。我怎样才能做到这一点... 类似 <th style="width:200px;"><%# Eval("Utility_Id.name") %></th>
或者是在后面的代码中完成的...感谢您的任何回复

aspx:

 <asp:Repeater id="rptSelectedUtilities" runat="server">
                <HeaderTemplate>
                    <table class="detailstable FadeOutOnEdit">
                        <tr>   
                            <th style="width:200px;">Utility</th>    
                        </tr>
                </HeaderTemplate>
                <ItemTemplate>
                        <tr>
                            <th style="width:200px;"><%# Eval("Utility_Id") %></th> 
                        </tr>
                </ItemTemplate>
                <FooterTemplate>
                    </table>
                </FooterTemplate>
            </asp:Repeater>

隐藏代码:

DBData db = new DBDatat();
        List<Select_Utility> SelectedUtility = 
            (from SU in db.Select_Utilities
             where SU.Work_Id == 3
             select SU).ToList();

        rptSelectedUtilities.DataSource = SelectedUtility;

rptSelectedUtilities.DataBind();

---

编辑:

   DBData db = new DBDatat();
    List<Utility_Company> Utility = new List<Utility_Company>();
    List<Select_Utility> SelectedUtility = 
        (from SU in db.Select_Utilities
         join UTL in Utility on SU equals UTL.id
         where SU.Worksite_Id == 3
         select SU).ToList();

    rptSelectedUtilities.DataSource = SelectedUtility;
    rptSelectedUtilities.DataBind();

抛出错误“连接子句中的表达式之一的类型不正确”。调用“join”时类型推断失败

//连接应该是名称..所以在SU上的Utility中加入UTL等于UTL.Name//而不是UTL.id

还尝试在 SU 上的 db.Utility_Companies 中加入 UTL 等于 UTL.id...但出现相同的错误

---

第二次编辑: <%# Eval("名称") %> 抛出错误:DataBinding:“Select_Utility”不包含名称为“Name”的属性。

     DBData db = new DBData();

        List<Select_Utility> SelectedUtility = 
            (from SU in db.Select_Utilities
             where SU.Worksite_Id == 3
             select SU).ToList();

        rptSelectedUtilities.DataSource = SelectedUtility;
        rptSelectedUtilities.DataBind();


   List<Utility_Company> Utility = new List<Utility_Company>();
        var query = from u in db.Utility_Companies
                    join su in db.Select_Utilities
                         on u.id equals su.Utility_Id
                    where su.Worksite_Id == 3
                    select u;

        rptSelectedUtilities.DataSource = query.ToList();
        rptSelectedUtilities.DataBind();

Answer 1

查询(您应该选择加入的实用程序):

DBData db = new DBDatat();
var query = from u in db.Utility
            join su in db.Select_Utilities
                 on u.Id equals su.Utility_Id
            where su.Work_Id == 3
            select u;

rptSelectedUtilities.DataSource = query.ToList();
rptSelectedUtilities.DataBind();

页面(实用程序的显示名称):

<th style="width:200px;"><%# Eval("Name") %></th>