ASP .NET의 Setter 속성에서 DropDownList에 항목을 추가 할 수 없습니다.

Question

Setter의 DropDownList에 항목을 추가하려고하는데 추가 된 항목이 유지되지 않습니다.

이 질문 (Switched to ASP.NET 3.5, DropDownList doesn't remember dynamically added items) 여기

내 코드는에 제안 viewstate가 올바르게 설정되어 있는지 확인했다.

Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init 
     If ddlCountry.Items.Count < Country.GetList.Length Then 
      ddlCountry.DataSource = Country.GetList() 
      ddlCountry.DataBind() 
      'At this point, there are correctly 231 items in ddlCountry.' 
     End If 
    End Sub 

    Public WriteOnly Property Country() As String 
     Set(ByVal Value As String) 
      If ddlCountry.Items.FindByValue(Value.Country) Is Nothing Then 
       Dim li As New ListItem(Value.Country, Value.Country) 
       ddlCountry.Items.Insert(0, li) 
       ddlCountry.SelectedIndex = ddlCountry.Items.IndexOf(li) 
       'At this point, there are correctly 232 items in ddlCountry' 
      Else 
       ddlCountry.SelectedValue = Value.Country 
      End If 
     End Set 
    End Property 

    Private Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender 
     If ddlCountry.Items.FindByText("<-- Please Select-->") Is Nothing Then 
      'At this point, we are incorrectly' 
      'back to 231 items - this is the problem.' 
      ddlCountry.Items.Insert(0, New ListItem("<-- Please Select-->", "")) 
     End If 
    End Sub 

Answer 1

드롭 다운 목록에서 AppendDataBoundItems 속성을 true로 설정하려고 했습니까?