如何使用嵌套转发器在 asp.net 网络表单中显示带复选框的母公司和子公司列表 select

Question

Company table in SQL server using asp.net web forms to show all of companies first with a parent company and sub-companies under the parent company, with a checkbox列出 select 个公司。在第一个 SQL SP 中，我从数据 table 中获取母公司列表，而该公司 ID 来自第一个数据 table( ex:1,2,3) 循环到在第二个数据表中获取子公司列表

我已经尝试使用嵌套中继器来处理 2 个数据 tables 但不确定如何实现这个以及哪个是最好的控制

    protected void Page_Load(object sender, EventArgs e)
    {

        if (!Page.IsPostBack)
        {
            DataTable dtx = Getparentfirm();
            DataTable dso = GetSuboffice(dtx);
            R1.DataSource = dtx;
            R1.DataBind();
            R2.DataSource = dso;
            R2.DataBind();
        }

    }

    private DataTable Getparentfirm()
    {
        using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=test;Integrated Security=True"))
        {
            SqlDataAdapter sda = new SqlDataAdapter("select * from company where parentcompany is NULL", conn);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            return dt;
        }

    }
    private DataTable GetSuboffice(DataTable dt)
    {
        DataTable dtz = new DataTable();
        using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=test;Integrated Security=True"))
            foreach (DataRow row in dt.Rows)
            {                           
            SqlDataAdapter sda = new SqlDataAdapter("select  id, fname , lname from customer where cid =" + row["cid"].ToString(), conn);                           
            sda.Fill(dtz);
            return dtz;
        }
        return null;
    }

       <asp:Repeater ID="R1" runat="server">
            <ItemTemplate>
                    name:<%# Eval("companyname") %></td>
            </ItemTemplate>
            <asp:Repeater ID="R2" runat="server">
                    <ItemTemplate>
                        ID :<%# Eval("companyid") %>
                        Name:<%# Eval("companyname") %>

                </ItemTemplate>
            </asp:Repeater>
        </asp:Repeater>

如何将 2 个数据table绑定到嵌套的转发器以获得预期的输出。任何帮助都会很棒

预期输出

      parentcompanyid 1     parent company one          checkbox
        sub office 1.1        sub office one            checkbox
        sub office 1.2        sub office two            checkbox
      parent comapnyid 2    parent company two          checkbox 
         sub office 2.1        sub office one           checkbox
        sub office 2.2        sub office two            checkbox

Answer 1

当您使用 Repeater 时，请确保您的所有内容都在模板节点内，例如 <ItemTemplate> - 即使是嵌套的 Repeater。

一旦标记正确，您可以将一个 OnItemDataBound 事件附加到父 Repeater，然后使用该项目的 ID 获取数据以绑定嵌套的 Repeater，然后绑定它。例如：

ASPX

        <asp:Repeater ID="R1" runat="server" OnItemDataBound="R1_ItemDataBound">
            <ItemTemplate>
                  <asp:HiddenField runat="server" ID="CompanyId" value='<%# Eval("id") %>' />
                  <div>name:<%# Eval("companyname") %></div>

                  <asp:Repeater ID="R2" runat="server">
                    <ItemTemplate>
                        ID :<%# Eval("companyid") %><br>
                        Name:<%# Eval("companyname") %>
                    </ItemTemplate>
                  </asp:Repeater>
            </ItemTemplate>                
        </asp:Repeater>

CS

    protected void Page_Load(object sender, EventArgs e)
    {   
        if (!Page.IsPostBack)
        {
            DataTable dtx = Getparentfirm();
            R1.DataSource = dtx;
            R1.DataBind();
        }  
    }    

    protected void R1_ItemDataBound(Object Sender, RepeaterItemEventArgs e) {
          // Get companyId from hidden field 
          // or you could get it from e.Item.DataItem which should have the data for this row of data
          var CompanyID = (HiddenField)e.Item.FindControl("CompanyId");
          var id = Convert.ToInt32(CompanyID.Value);

          var R2 = (Repeater)e.Item.FindControl("R2");
          var dso = GetData(id); // Get sub companies based on this company id

          R2.DataSource = dso;
          R2.DataBind();
       }

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如何使用嵌套转发器在 asp.net 网络表单中显示带复选框的母公司和子公司列表 select

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