RadGrid 自定义过滤器在回发时丢失值

Question

我在使用 FilterTemplates 进行 Radgrid 过滤时遇到问题。我将值绑定到 ItemDataBound 事件内 FilterTemplates 内的控件中，并且绑定工作正常，除非单击“筛选”按钮时我会丢失值。

这是来自 ItemDataBound 事件的代码，我在其中将值绑定到控件：

protected void gvDaily_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridFilteringItem)
        {
            GridFilteringItem filterItem = (GridFilteringItem)e.Item;
            RadComboBox rcbManagerDailyFilter = (RadComboBox)filterItem.FindControl("rcbManagerDailyFilter");
            RadComboBox rcbTvrtkaDailyFilter = (RadComboBox)filterItem.FindControl("rcbTvrtkaDailyFilter");
            RadComboBox rcbDolazakDailyFilter = (RadComboBox)filterItem.FindControl("rcbDolazakDailyFilter");

            rcbManagerDailyFilter.Items.Clear();
            rcbTvrtkaDailyFilter.Items.Clear();
            rcbDolazakDailyFilter.Items.Clear();

            rcbDolazakDailyFilter.Items.Add(new RadComboBoxItem("Odaberi vrstu", "0"));
            rcbDolazakDailyFilter.Items.Add(new RadComboBoxItem("Rad", "1"));
            rcbDolazakDailyFilter.Items.Add(new RadComboBoxItem("Dolazak", "2"));
            rcbDolazakDailyFilter.Items.Add(new RadComboBoxItem("Sve", "3"));

            var kontaktiList = (from k in db.Kontakt
                                select k).ToList();

            var kontaktiM = from k in kontaktiList
                            orderby k.Prezime, k.Ime
                            where k.Firma.Naziv == "IDE3"
                            select new { k.idKontakt, Osoba = k.Ime + " " + k.Prezime };


            rcbManagerDailyFilter.Items.Add(new RadComboBoxItem("Odaberi managera", "0"));
            rcbManagerDailyFilter.DataSource = kontaktiM;
            rcbManagerDailyFilter.DataValueField = "Osoba";
            rcbManagerDailyFilter.DataTextField = "Osoba";
            rcbManagerDailyFilter.DataBind();

            var tvrtkaList = from t in db.Firma
                             orderby t.Naziv
                             select new { t.idFirma, t.Naziv };

            rcbTvrtkaDailyFilter.Items.Add(new RadComboBoxItem("Odaberi tvrtku", "0"));
            rcbTvrtkaDailyFilter.DataSource = tvrtkaList;
            rcbTvrtkaDailyFilter.DataValueField = "Naziv";
            rcbTvrtkaDailyFilter.DataTextField = "Naziv";
            rcbTvrtkaDailyFilter.DataBind();
        }
    }

以下代码是过滤 RadGrid 的单击事件：

 protected void btnTrazi_Click(object sender, EventArgs e)
    {
        GridFilteringItem item = gvDaily.MasterTableView.GetItems(GridItemType.FilteringItem)[0] as GridFilteringItem;

        RadComboBox rcbManagerDailyFilter = (RadComboBox)item.FindControl("rcbManagerDailyFilter");
        RadComboBox rcbTvrtkaDailyFilter = (RadComboBox)item.FindControl("rcbTvrtkaDailyFilter");
        RadDatePicker txtDatumPrijaveDailyOdFilter = (RadDatePicker)item.FindControl("txtDatumPrijaveDailyOdFilter");
        RadDatePicker txtDatumPrijaveDailyDoFilter = (RadDatePicker)item.FindControl("txtDatumPrijaveDailyDoFilter");
        RadioButtonList rblDolazakFilter = (RadioButtonList)item.FindControl("rblDolazakFilter");

        string tvrtka = rcbTvrtkaDailyFilter.SelectedItem.Text;
        string manager = rcbManagerDailyFilter.SelectedItem.Text;
        string datumPrijaveOd = (txtDatumPrijaveDailyOdFilter.SelectedDate).ToString();
        string datumPrijaveDo = (txtDatumPrijaveDailyDoFilter.SelectedDate).ToString();


        string expression = "";

        if (tvrtka  != "Odaberi tvrtku")
        {
            expression += "([Tvrtka] = '" + tvrtka + "')";
        }

        if (manager != "Odaberi managera")
        {
            expression += " AND ";
            expression += "([DailyManager] = '" + manager + "')";
        }

        if (datumPrijaveOd.Length != 0)
        {
            expression += " AND ";
            expression += "([Datum] >= '" + datumPrijaveOd + "')";
        }

        if (datumPrijaveDo.Length != 0)
        {
            expression += " AND ";
            expression += "([Datum] <= '" + datumPrijaveDo + "')";
        }


        gvDaily.MasterTableView.FilterExpression = expression;
        gvDaily.Rebind();
    }
}

我需要有关如何在单击导致回发的过滤器按钮后修复控件中丢失的值的帮助。

问候，

赫尔沃耶