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MainPage.xaml.cs
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MainPage.xaml.cs
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using Syncfusion.UI.Xaml.TreeGrid;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Diagnostics;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.UI.Core;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
namespace OnDemandLoading
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
ViewModel viewModel = new ViewModel();
public MainPage()
{
this.InitializeComponent();
treeGrid.Loaded += TreeGrid_Loaded;
treeGrid.Unloaded += TreeGrid_Unloaded;
}
private void TreeGrid_Unloaded(object sender, RoutedEventArgs e)
{
treeGrid.RequestTreeItems -= TreeGrid_RequestTreeItems;
this.treeGrid.RepopulateTree();
}
private async void TreeGrid_Loaded(object sender, RoutedEventArgs e)
{
treeGrid.RequestTreeItems += TreeGrid_RequestTreeItems;
this.treeGrid.RepopulateTree();
}
System.Threading.AutoResetEvent autoreset = new System.Threading.AutoResetEvent(false);
private async void TreeGrid_RequestTreeItems(object sender, TreeGridRequestTreeItemsEventArgs args)
{
if (args.ParentItem == null)
{
args.ChildItems = viewModel.Employees.Where(x => x.ReportsTo == -1);
}
//if ParentItem not null, then set args.ChildList to the child items for the given ParentItem.
else
{
//get the children of the parent object
EmployeeInfo emp = args.ParentItem as EmployeeInfo;
if (emp != null)
{
await Task.Run(async () =>
{
var childItems = await viewModel.GetEmployees(emp.ID);
await this.treeGrid.Dispatcher.RunAsync(CoreDispatcherPriority.High, () =>
{
args.ParentNode.PopulateChildNodes(childItems);
});
});
}
}
}
}
}