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MainWindow.xaml.cs
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MainWindow.xaml.cs
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using DevExpress.Data;
using DevExpress.Xpf.Grid;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace CustomSummary_EmptyCells_CodeBehind {
public class DataItem {
public string Text { get; set; }
public int? Number { get; set; }
}
public partial class MainWindow : Window {
public MainWindow() {
InitializeComponent();
grid.ItemsSource = GetItems().ToList();
}
static IEnumerable<DataItem> GetItems() {
return Enumerable.Range(0, 100).Select(i => new DataItem() { Text = "group " + i % 10, Number = i % 3 == 0 ? default(int?) : i });
}
void OnCustomSummary(object sender, CustomSummaryEventArgs e) {
if(((GridSummaryItem)e.Item).FieldName != "Number")
return;
if(e.SummaryProcess == CustomSummaryProcess.Start) {
e.TotalValue = 0;
}
if(e.SummaryProcess == CustomSummaryProcess.Calculate) {
if(IsEmptyCell(e.FieldValue))
e.TotalValue = (int)e.TotalValue + 1;
}
}
bool IsEmptyCell(object fieldValue) {
return !((int?)fieldValue).HasValue;
}
}
}