BeginUpdate doesn't work in Listbox

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  • Anil Gupte
    #1

    BeginUpdate doesn't work in Listbox

    I am using the following code:

    URLListBox.Begi nUpdate()
    URLListBox.Data Source = DSContent '.Tables("Conte ntSites")
    URLListBox.Disp layMember = "ContentSites.S iteName"
    URLListBox.Valu eMember = "ContentSites.U RL"
    URLListBox.EndU pdate()
    The program execution insistis on going to the Sub
    URLListBox_Sele ctedIndexChange d after the 2nd line (URLListBox.Dat aSource
    =...) It does this for each item in the DataSet. Isn't this exactly what
    BeginUpdate is supposed to prevent?

    Thanx,
    --
    Anil Gupte
    Home - k.e.e.n. inc.
    https://www.keeninc.net
    Innovate with UsLeading the Way in Advanced Technology Solutions Discover state-of-the-art services in logistics, databases, and AI designed for evolving

    Just a moment...
    https://www.icinema.com



    Tags: None
    • Armin Zingler
      #2
      Re: BeginUpdate doesn't work in Listbox

      "Anil Gupte" <anil-list@icinema.co mschrieb
      I am using the following code:
      >
      URLListBox.Begi nUpdate()
      URLListBox.Data Source = DSContent '.Tables("Conte ntSites")
      URLListBox.Disp layMember = "ContentSites.S iteName"
      URLListBox.Valu eMember = "ContentSites.U RL"
      URLListBox.EndU pdate()
      The program execution insistis on going to the Sub
      URLListBox_Sele ctedIndexChange d after the 2nd line
      (URLListBox.Dat aSource =...) It does this for each item in the
      DataSet. Isn't this exactly what BeginUpdate is supposed to
      prevent?
      No, it has nothing to do with events. It only defines whether the view
      is immediatelly refreshed as soon as the listbox' content changes. This
      is because doing a lot of consequtive operations affecting the view
      would cause a refresh after each operation. This costs performance.
      To avoid this, you can suppress the refresh by calling beginupdate, do
      the operations, and call Endupdate afterwards. This makes the listbox
      refresh only once, at EndUpdate, after all operations have been done.

      Armin

        Comment

        • Anil Gupte
          #3
          Re: BeginUpdate doesn't work in Listbox

          So how do I prevent the code execution from going to the
          _SelectedIndexC hanged when I am populating the listbox?

          Thanx for your help.
          --
          Anil Gupte
          Home - k.e.e.n. inc.
          https://www.keeninc.net
          Innovate with UsLeading the Way in Advanced Technology Solutions Discover state-of-the-art services in logistics, databases, and AI designed for evolving

          Just a moment...
          https://www.icinema.com


          "Armin Zingler" <az.nospam@free net.dewrote in message
          news:O6%23VaQPi IHA.1208@TK2MSF TNGP03.phx.gbl. ..
          "Anil Gupte" <anil-list@icinema.co mschrieb
          >I am using the following code:
          >>
          > URLListBox.Begi nUpdate()
          > URLListBox.Data Source = DSContent '.Tables("Conte ntSites")
          >URLListBox.Dis playMember = "ContentSites.S iteName"
          > URLListBox.Valu eMember = "ContentSites.U RL"
          > URLListBox.EndU pdate()
          >The program execution insistis on going to the Sub
          >URLListBox_Sel ectedIndexChang ed after the 2nd line
          >(URLListBox.Da taSource =...) It does this for each item in the
          >DataSet. Isn't this exactly what BeginUpdate is supposed to
          >prevent?
          >
          No, it has nothing to do with events. It only defines whether the view
          is immediatelly refreshed as soon as the listbox' content changes. This
          is because doing a lot of consequtive operations affecting the view
          would cause a refresh after each operation. This costs performance.
          To avoid this, you can suppress the refresh by calling beginupdate, do
          the operations, and call Endupdate afterwards. This makes the listbox
          refresh only once, at EndUpdate, after all operations have been done.
          >
          Armin
          >

            Comment

            • Armin Zingler
              #4
              Re: BeginUpdate doesn't work in Listbox

              "Anil Gupte" <anil-list@icinema.co mschrieb
              So how do I prevent the code execution from going to the
              _SelectedIndexC hanged when I am populating the listbox?
              I don't know, I don't use data binding. I'd set a flag before filling
              the listbox and clear it afterwards. In the event handler, immediatelly
              exit the procedure if the flag is set.


              Armin

                Comment

                • Steven
                  #5
                  Re: BeginUpdate doesn't work in Listbox

                  RemoveHandler URLListBox.Sele ctedIndexChange d, AddressOf
                  URLListBox_Sele ctedIndexChange d
                  URLListBox.Disp layMember = "ContentSites.S iteName"
                  URLListBox.Valu eMember = "ContentSites.U RL"
                  URLListBox.Data Source = DSContent '.Tables("Conte ntSites")
                  AddHandler URLListBox.Sele ctedIndexChange d, AddressOf
                  URLListBox_Sele ctedIndexChange d


                  "Anil Gupte" <anil-list@icinema.co mwrote in message
                  news:ucVIQbMiIH A.5504@TK2MSFTN GP05.phx.gbl...
                  >I am using the following code:
                  >
                  URLListBox.Begi nUpdate()
                  URLListBox.Data Source = DSContent '.Tables("Conte ntSites")
                  URLListBox.Disp layMember = "ContentSites.S iteName"
                  URLListBox.Valu eMember = "ContentSites.U RL"
                  URLListBox.EndU pdate()
                  The program execution insistis on going to the Sub
                  URLListBox_Sele ctedIndexChange d after the 2nd line (URLListBox.Dat aSource
                  =...) It does this for each item in the DataSet. Isn't this exactly what
                  BeginUpdate is supposed to prevent?
                  >
                  Thanx,
                  --
                  Anil Gupte
                  Home - k.e.e.n. inc.
                  https://www.keeninc.net
                  Innovate with UsLeading the Way in Advanced Technology Solutions Discover state-of-the-art services in logistics, databases, and AI designed for evolving

                  Just a moment...
                  https://www.icinema.com

                  >
                  >

                    Comment

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