我需要能够隐藏从我的动态项目符号列表(构建在 DetailsView 内部)中显示的 2 个选项。每次我尝试通过 BulletedList 编写循环时,都会收到一条错误消息,指出它不是集合类型,所以我想我可以循环通过 DetailsView 来找到我想要隐藏的项目。
我无法更改 SQL,因为这个特殊的项目符号列表在 2 个不同的页面上使用,只是在一个页面上,我只需要显示与 ID 关联的 4 个项目中的 2 个。
<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>
我试过了:
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 告诉我它不是集合类型。所以我想我可以在下面的代码中放一个 For Each 。我不知道如何遍历DetailsView,有人可以在这里指出正确的方向吗?
Protected Sub dvSurveyQuestions_DataBound(ByVal sender As Object, ByVal e As
System.EventArgs) Handles dvSurveyQuestions.DataBound
End Sub
更新 2/6:我使用 FindControl 声明了我的 BulletedList 并且没有更多错误说 BulletedList 没有声明。
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:我需要为 33 的唯一 QuestionID 获取 blText。 QuestionID 是一个整数,但我不知道如何将 HiddenField 与整数字段相关联。在这段代码中,“Is”被下划线表示Is operator does not accept opeands of type 'Integer.'
所以我将 Is 更改为 = 并得到错误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
这是有效的
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