using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using DevExpress.Mobile.DataGrid; namespace DevExpress.GridDemo { public partial class SummaryCustomPage { public SummaryCustomPage() { InitializeComponent(); BindData(); } async void BindData() { BindingContext = await LoadData(); } Task<MainPageViewModel> LoadData() { return Task<MainPageViewModel>.Run(() => new MainPageViewModel(new DemoOrdersRepository())); } void OnCalculateCustomSummary(object sender, CustomSummaryEventArgs e) { if (e.FieldName == "Total" && e.IsTotalSummary) { if (e.SummaryProcess == CustomSummaryProcess.Start) { e.TotalValue = 0.0; } else if (e.SummaryProcess == CustomSummaryProcess.Calculate) { double value = Convert.ToDouble(e.FieldValue); if (value > 100.0) e.TotalValue = Convert.ToDouble(e.TotalValue) + value; } } } } }