Order of the loads[Answered] RSS

• • Reply
  volar.2016

  Member

  6 Points

  25 Posts

  Order of the loads

  Jul 26, 2020 09:08 AM|volar.2016|LINK

  Hi all:

  I have a dropdownlist and a repeater.

  I make some operations in the dropdownlist.databound event and repeater.itemdatabound

  I need that the  load of the repeater takes place before the dropdownist because in this event I reference an element of the repeater.

          If DirectCast(rptimporte.Items(0).FindControl("litimporte"), Literal).Text = 0 Then
              s.Items(4).Enabled = False
          Else
              s.SelectedValue = 6
          End If
  

  I see that in some cases in the aspx pages (I have the same dropdownlist and repeter in various pages) the repeater is loaded before the dropdownlist, and in other cases the dropdownlist is loaded before the repeater, and in this case I get an error

  El índice estaba fuera del intervalo. Debe ser un valor no negativo e inferior al tamaño de la colección. Nombre del parámetro: index

  This is because the repeater has not elements.

  What the controls load depend of? Can I manage it?

  Thanks in advance.

  Make the difference
• • Reply
  yij sun

  Contributor

  3730 Points

  1417 Posts

  Re: Order of the loads

  Jul 27, 2020 03:44 AM|yij sun|LINK

  Hi volar.2016，

  volar.2016

  What the controls load depend of? Can I manage it?

  As far as I think,you couldn't manage the order the order of the loads.OnItemDataBound is modified after it is bound to an item in the Repeater control but before it is rendered on the page. And DataBound is raised at the end of the data binding operation in the data bound control.The error is not relation of the order.

  volar.2016

  This is because the repeater has not elements.

  The error is when you are excuting the onitemdatanound event,the item didn't databound.

  Accroding to your codes,I have create a demo.When the repeater index=0.then you will find the Literal control.You could bind the data of dropdownlist in the codes.

  More details,you could refer to below codes:

         <div>
              <asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">
                  <HeaderTemplate>
                      <asp:Label runat="server" Text="text"></asp:Label>
                  </HeaderTemplate>
                  <ItemTemplate>
                      <asp:Literal ID="Literal1" runat="server" Text='<%# Eval("Year") %>'></asp:Literal>
                  </ItemTemplate>
              </asp:Repeater>
          </div>
          <asp:DropDownList ID="DropDownList1" runat="server" OnDataBound="DropDownList1_DataBound" AutoPostBack="false"></asp:DropDownList>
  

  Code-behind:

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
          If Not Me.IsPostBack Then
              Me.BindDrop()
              Me.BindRepeater()
  
          End If
      End Sub
      Private Sub BindRepeater()
          Dim constr As String = ConfigurationManager.ConnectionStrings("aspnet-TestApplicationWithDatabase-20190820030542").ConnectionString
          Using con As SqlConnection = New SqlConnection(constr)
              Using cmd As SqlCommand = New SqlCommand("SELECT * FROM Sum", con)
                  Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                      Dim dt As DataTable = New DataTable()
                      sda.Fill(dt)
                      Repeater1.DataSource = dt
                      Repeater1.DataBind()
                  End Using
              End Using
          End Using
      End Sub
      Private Sub BindDrop()
          Dim constr As String = ConfigurationManager.ConnectionStrings("aspnet-TestApplicationWithDatabase-20190820030542").ConnectionString
          Using con As SqlConnection = New SqlConnection(constr)
              Using cmd As SqlCommand = New SqlCommand("SELECT * FROM Sum", con)
                  Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                      Dim dt As DataTable = New DataTable()
                      sda.Fill(dt)
                      DropDownList1.DataSource = dt
  
                      DropDownList1.DataTextField = "Id"
                      DropDownList1.DataValueField = "Id"
  
                      DropDownList1.DataBind()
                  End Using
              End Using
          End Using
      End Sub
      Protected Sub DropDownList1_DataBound(sender As Object, e As EventArgs)
          If (DropDownList1.Items.Count > 0) Then
              For Each li As ListItem In DropDownList1.Items
                  li.Text = Server.HtmlDecode(li.Text)
  
              Next
          End If
  
      End Sub
  
      Protected Sub Repeater1_ItemDataBound(sender As Object, e As RepeaterItemEventArgs)
          If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
              If e.Item.ItemIndex = 0 Then
  
                  If DirectCast(e.Item.FindControl("Literal1"), Literal).Text = 0 Then
  
                      'Label1.Text = "1"
                      DropDownList1.Items(2).Enabled = False
                  Else
                      DropDownList1.SelectedValue = 3
                  End If
  
  
              End If
          End If
  
      End Sub

  Best regards,

  Yijing Sun

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