Question

我正在尝试使用内部的复选框执行嵌套转发器控件。基本上，我想要的是对复选框进行分类，例如，

Group 1
   Item 1
   Item 2

Group 2
   Item 3
   Item 4

Group 3
   Item 5
   Item 6

我面临的问题是，我收到错误：

错误1：未声明'DataRowView'。由于其防护等级，它可能无法访问错误2：未声明名称“DataRowView”。

ASPX：

  <asp:Repeater ID="rp_Groups" runat="server" OnItemDataBound="rp_Groups_ItemDataBound" >
        <ItemTemplate>
            <ul>
                <asp:CheckBox runat="server" ID="chk_Group" Text='<%# Eval("category_type") %>' Value='<%# Eval("service_type_category_id") %>' onclick="OnGroupClick" />
                <p class="nested">
                 <asp:CheckBoxList runat="server" ID="chk_Items" DataValueField="ServiceTypeID" DataTextField="Name"
                 DataSource='<%# ((DataRowView)Container.DataItem).CreateChildView("FK_esnServiceType_Service_Type_Categorization") %>' ></asp:CheckBoxList>

                </p>
            </ul>
        </ItemTemplate>
    </asp:Repeater>

代码隐藏：

Public Sub Fill()  
    Dim dtServiceCategory As DataTable = ServiceTypeModel.GetService_Categories()
    Dim dtServiceType As DataTable = ServiceTypeModel.Search("", True)

    rp_Groups.DataSource = dtServiceCategory
    rp_Groups.DataBind()

    Dim ds As New DataSet()
    ds.Tables.Add(dtServiceCategory)
    ds.Tables.Add(dtServiceType)

    Dim relation As New DataRelation("FK_esnServiceType_Service_Type_Categorization", ds.Tables("dtServiceCategory").Columns("service_type_category_id"), ds.Tables("dtServiceType").Columns("CategorizationID"), False)
    ds.Relations.Add(relation)
    relation.Nested = True
End Sub

Protected Sub rp_Groups_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rp_Groups.ItemDataBound
    Dim chklist As CheckBoxList = DirectCast(e.Item.FindControl("chk_Items"), CheckBoxList)
    If chklist IsNot Nothing Then
        chklist.DataSource = DirectCast(e.Item.DataItem, DataRowView).CreateChildView("FK_esnServiceType_Service_Type_Categorization")
        chklist.DataBind()
    End If
End Sub

我缺少什么？

Answer 1

您应该检查ItemDataBound事件中触发了哪个itemtype，这可能是也可能不是问题，因为您没有页眉和页脚模板，但这仍然是一个好习惯。

Protected Sub rp_Groups_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rp_Groups.ItemDataBound
  If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
    Dim chklist As CheckBoxList = DirectCast(e.Item.FindControl("chk_Items"), CheckBoxList)
    If chklist IsNot Nothing Then
      chklist.DataSource = DirectCast(e.Item.DataItem, DataRowView).CreateChildView("FK_esnServiceType_Service_Type_Categorization")
      chklist.DataBind()
    End If
  End If
End Sub

修改

我刚刚注意到，在您已经绑定了转发器的数据源之后，您正在添加关系。在添加关系后尝试移动.databind。

编辑2

好的，你可以尝试一下。将datatables添加到dataset并将转发器数据源设置为：ds.Tables(0)

Public Sub Fill() Dim ds As New DataSet() Dim dtServiceCategory As DataTable = ServiceTypeModel.GetService_Categories() Dim dtServiceType As DataTable = ServiceTypeModel.Search("", True) ds.Tables.Add(dtServiceCategory) ds.Tables.Add(dtServiceType) Dim relation As New DataRelation("FK_esnServiceType_Service_Type_Categorization", ds.Tables("dtServiceCategory").Columns("service_type_category_id"), ds.Tables("dtServiceType").Columns("CategorizationID"), False) relation.Nested = True ds.Relations.Add(relation) rp_Groups.DataSource = ds.Tables(0) rp_Groups.DataBind() End Sub

Answer 2

确保已导入名称空间System.Data

尝试添加

<%@ Import Namespace="System.Data" %>

到您的ASPX文件。

作为另一种选择，您可以全局导入名称空间，而不仅仅是在一个页面中：

http://msmvps.com/blogs/simpleman/archive/2006/01/11/80804.aspx

使用asp.net的带有Checkbox列表的嵌套转发器

2 个答案: