public FilterDataViewModel() { MyTitle = "Filter Data Analisa"; CancelCommand = new CommandHandler { CanExecuteAction = x => true, ExecuteAction = CancelAction }; SaveCommand = new CommandHandler { CanExecuteAction = SaveValidate, ExecuteAction = SaveAction }; Fakultases = context.GetFakultas(); using (var db = new DbContext()) { int number = 1; var items = (from m in db.Mahasiswa.Select() join p in db.Progdi.Select() on m.IdProgdi equals p.Id join f in db.Fakultas.Select() on p.ParentId equals f.Id select new Mahasiswa { Gelombang = m.Gelombang, HasilTest = m.HasilTest, IdJurusan = m.IdJurusan, IDMahasiswa = m.IDMahasiswa, IdProgdi = m.IdProgdi, IPK = m.IPK, MasaStudi = m.MasaStudi, Nama = m.Nama, NPM = m.NPM, Suku = m.Suku, FakultasId = f.Id }).ToList(); foreach (var item in items) { item.Jurusan = db.Jurusan.Where(x => x.Id == item.IdJurusan).FirstOrDefault(); item.SukuModel = DataHelpers.DataSuku.Where(x => x.Nilai == item.Suku).FirstOrDefault(); item.GelombangModel = DataHelpers.DataGelombang.Where(x => x.Nilai == item.Gelombang).FirstOrDefault(); DataSource.Add(item); number++; } DataSourceView = (CollectionView)CollectionViewSource.GetDefaultView(DataSource); DataSourceView.Filter = filterData; SliderMaximum = DateTime.Now.Year; SliderMinimum = SliderMaximum - 10; AngkatanMinimum = SliderMinimum; AngkatanMaximum = SliderMaximum; DataSourceView.Refresh(); } }