Question

I’ve a simple table with only one column UrzadSkarbowyWojewodztwo that I’m trying to attach Entity Framework query to ComboBoxEdit or LookUpEdit (preferably both for reference). Can somebody share a a way to do this considering that I don’t want do it from GUI?

I tried multiple ways and it’s simply failing every time. I’m sure I’m missing something…

using (var context = new EntityBazaCRM(Settings.sqlDataConnectionDetails))
        {
            IQueryable<UrzedySkarboweWojewodztwa> listaWojewodztw = from d in context.UrzedySkarboweWojewodztwas
                                                       select d;

            //lookUpEdit1.DataBindings.Add("EditValue", listaWojewodztw, "", true);
            lookUpEdit1.DataBindings.Add("EditValue", listaWojewodztw, "UrzadSkarbowyWojewodztwo", true);
            lookUpEdit1.Properties.DataSource = listaWojewodztw.ToList();
            lookUpEdit1.Properties.DisplayMember = "UrzadSkarbowyWojewodztwo";
            lookUpEdit1.Properties.ValueMember = "UrzadSkarbowyWojewodztwo";

            LookUpColumnInfo col = new LookUpColumnInfo("UrzadSkarbowyWojewodztwo", "Województwo", 100) { SortOrder = DevExpress.Data.ColumnSortOrder.Ascending };
            lookUpEdit1.Properties.Columns.Add(col);

Answer 1

To be able to bind Entity Framework list with DevExpress ComboBoxEdit one needs to create additional partial class which has the same name as the object we’re trying to put into ComboBoxEdit. Into that class we need to put an override on the ToString() for value we want to display in the ComboBoxEdit for the user.

public partial class SzkolenieMiejsca : EntityObject {
    public override string ToString() {
        return _MiejsceSzkolenia;
    }
}

Then we simply assign objects to the ComboBoxItemCollection and Devexpress will do the rest.

 using (var context = new EntityBazaCRM(Settings.sqlDataConnectionDetailsCRM))
        {
            IQueryable<SzkolenieMiejsca> listaMiejsc = from d in context.SzkolenieMiejscas
                                                                    select d;


            ComboBoxItemCollection collection = comboBox.Properties.Items;
            collection.BeginUpdate();
            foreach (var miejsce in listaMiejsc)
            {
                collection.Add(miejsce);
            }
            collection.EndUpdate();
            comboBox.SelectedIndex = -1;
        }