通过DetailsView控件循环隐藏动态的BulletedList项目

Question

我需要能够以隐藏从我的动态显示的BulletedList 2个选项（这是一个DetailsView内建成）。每次我尝试通过BulletedList编写一个循环时，我都会收到一个错误，说它不是一个集合类型，所以我想我可以遍历DetailsView来查找要隐藏的项目。

我不能改变SQL，因为这个特殊的项目符号列表大干快上2个不同的页面中，它只是一个，我只需要显示与该ID相关联的4个项目中2。

<asp:TemplateField HeaderText="Answer(s)" SortExpression="PicklistID"> 
     <ItemTemplate> 
      <asp:HiddenField ID="hiddenPicklistID" runat="server" 
      Value='<%# Bind("PicklistID") %>' /> 
      <asp:BulletedList ID="blText" runat="server" DataSourceID="dsPicklist" 
      DataTextField="TEXT"> 
      </asp:BulletedList> 
     <asp:SqlDataSource ID="dsPicklist" runat="server" 
     ConnectionString="<%$ ConnectionStrings:SurveyConnectionString %>" 
     SelectCommand="SELECT p.TEXT FROM PICKLIST p 
         JOIN C_Survey_Questions c 
         ON p.PICKLISTID = c.PicklistID 
         AND c.QuestionID = @QuestionID 
         AND c.SurveyID = @SurveyID 
         WHERE p.PICKLISTID IS NOT NULL 
         AND c.PicklistID IS NOT NULL"> 
      <SelectParameters> 
       <asp:ControlParameter ControlID="DropDownList1" Name="SurveyID" 
       PropertyName="SelectedValue" Type="Int32" /> 
       <asp:ControlParameter ControlID="hiddenQuestionID" Name="QuestionID" 
       PropertyName="Value" Type="Int32" /> 
      </SelectParameters> 
     </asp:SqlDataSource> 
     </ItemTemplate> 
    </asp:TemplateField> 

我已经试过：

Protected Sub blText_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) 
    Dim blText As BulletedList 
    For Each BulletedListItem In blText 

    Next 
End Sub 

但Visual Studio中告诉我，这是不是一个集合类型。所以我想我可以在下面的代码中添加一个For Each。我不知道如何通过DetailsView循环，有人可以在这里指出我正确的方向吗？

Protected Sub dvSurveyQuestions_DataBound(ByVal sender As Object, ByVal e As 
System.EventArgs) Handles dvSurveyQuestions.DataBound 
End Sub 

更新2/6：我宣布我的BulletedList使用的FindControl，有没有更多的错误说法的BulletedList未声明。

Protected Sub blText_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) 
    Dim blText As BulletedList = dvSurveyQuestions.FindControl("blText") 
    For Each i As ListItem In blText.Items 

    Next 
End Sub 

另一个更新：我需要得到blText为33.独特QuestionID的QuestionID是一个整数，但我不知道如何将HiddenField一个整数字段关联。在这段代码中，“是”被强调说Is operator does not accept opeands of type 'Integer.'所以我改变是一个=并且得到错误Operator = is not defined for types HiddenField and Integer.

Dim QuestionID = DirectCast(dvSurveyQuestions.FindControl("hiddenQuestionID"), HiddenField) 
    If QuestionID Is 33 Then 
     Dim blText As BulletedList = dvSurveyQuestions.FindControl("blText") 
     For intCursor = (blText.Items.Count - 1) To 0 Step -1 
      If blText.Items(intCursor).Text = "Self Directed" Or "Systems" Then 
       blText.Items.RemoveAt(intCursor) 
      End If 
     Next 
    End If 

这是从项目属性的作品

Dim QuestionID As Integer = CInt(CType(dvSurveyQuestions.FindControl("hiddenQuestionID"), HiddenField).Value) 
    If QuestionID = 33 Then 
     Dim blText As BulletedList = dvSurveyQuestions.FindControl("blText") 
     For intCursor = (blText.Items.Count - 1) To 0 Step -1 
      If blText.Items(intCursor).Text = "Self Directed" Or blText.Items(intCursor).Text = "Systems" Then 
       blText.Items.RemoveAt(intCursor) 
      End If 
     Next 
    End If 

Answer 1

循环BulletList。

For Each i As ListItem In blText.Items 

    Next 

这可能是更具体的，您的问题...

For intCursor = (blText.Items.Count - 1) To 0 Step -1 

     If blText.Items(intCursor).Text = "TextValueToRemove" Then 

      blText.Items.RemoveAt(intCursor) 

     End If 

    Next