RadGrid自定义过滤器在回发时丢失值

Question

我在使用FilterTemplates过滤Radgrid时遇到问题。我将值绑定到ItemDataBound事件中的FilterTemplates内的控件中，并且绑定工作正常，除非我单击“过滤器”按钮时丢失了我的值。

这是ItemDataBound事件中的代码，我将值绑定到控件：

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的点击事件：

 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过滤器按钮后修复控件中丢失值的帮助，这会导致回发。

此致

赫尔沃耶