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Sampath Narayanan
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Sample for On-Demand loading has been committed.
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‎CS/App.ico‎

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‎CS/App.xaml‎

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<Application x:Class="OnDemandLoading.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
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StartupUri="MainWindow.xaml">
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<Application.Resources />
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</Application>

‎CS/App.xaml.cs‎

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#region Copyright Syncfusion Inc. 2001 - 2015
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// Copyright Syncfusion Inc. 2001 - 2015. All rights reserved.
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// Use of this code is subject to the terms of our license.
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// A copy of the current license can be obtained at any time by e-mailing
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// licensing@syncfusion.com. Any infringement will be prosecuted under
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// applicable laws.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Data;
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using System.Linq;
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using System.Windows;
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namespace OnDemandLoading
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{
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/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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{
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public App()
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{
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Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense(Syncfusion.Licensing.DemoCommon.FindLicenseKey());
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}
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}
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}

‎CS/Commands/CollapseCommand.cs‎

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#region Copyright Syncfusion Inc. 2001-2016.
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// Copyright Syncfusion Inc. 2001-2016. All rights reserved.
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// Use of this code is subject to the terms of our license.
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// A copy of the current license can be obtained at any time by e-mailing
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// licensing@syncfusion.com. Any infringement will be prosecuted under
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// applicable laws.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows.Input;
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using Syncfusion.Windows.Controls.Grid;
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using Syncfusion.UI.Xaml.TreeGrid;
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namespace OnDemandLoading
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{
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public static class CollapseCommand
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{
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static CollapseCommand()
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{
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CommandManager.RegisterClassCommandBinding(typeof(SfTreeGrid), new CommandBinding(CollapseAll, OnExecuteCollapseAll));
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}
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public static RoutedCommand CollapseAll = new RoutedCommand("CollapseAll", typeof(SfTreeGrid));
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/// <summary>
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/// Called when [execute collapse all].
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/// </summary>
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/// <param name="sender">The sender.</param>
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/// <param name="args">The <see cref="System.Windows.Input.ExecutedRoutedEventArgs"/> instance containing the event data.</param>
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private static void OnExecuteCollapseAll(object sender, ExecutedRoutedEventArgs args)
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{
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SfTreeGrid treeGrid = args.Source as SfTreeGrid;
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treeGrid.CollapseAllNodes();
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}
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}
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}

‎CS/Commands/ExpandCommand.cs‎

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#region Copyright Syncfusion Inc. 2001-2016.
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// Copyright Syncfusion Inc. 2001-2016. All rights reserved.
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// Use of this code is subject to the terms of our license.
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// A copy of the current license can be obtained at any time by e-mailing
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// licensing@syncfusion.com. Any infringement will be prosecuted under
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// applicable laws.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows.Input;
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using Syncfusion.Windows.Controls.Grid;
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using Syncfusion.UI.Xaml.Grid;
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using Syncfusion.UI.Xaml.TreeGrid;
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namespace OnDemandLoading
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{
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public static class ExpandCommand
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{
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/// <summary>
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/// Initializes the <see cref="ExpandCommand"/> class.
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/// </summary>
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static ExpandCommand()
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{
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CommandManager.RegisterClassCommandBinding(typeof(SfTreeGrid), new CommandBinding(ExpandAll, OnExecuteExpandAll));
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}
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public static RoutedCommand ExpandAll = new RoutedCommand("ExpandAll", typeof(SfTreeGrid));
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/// <summary>
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/// Called when [execute expand all].
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/// </summary>
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/// <param name="sender">The sender.</param>
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/// <param name="args">The <see cref="System.Windows.Input.ExecutedRoutedEventArgs"/> instance containing the event data.</param>
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private static void OnExecuteExpandAll(object sender, ExecutedRoutedEventArgs args)
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{
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SfTreeGrid treeGrid = args.Source as SfTreeGrid;
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treeGrid.ExpandAllNodes();
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}
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}
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}

‎CS/Commands/LoadCommand.cs‎

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using Syncfusion.UI.Xaml.TreeGrid;
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using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Input;
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namespace OnDemandLoading.Commands
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{
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class LoadCommand : ICommand
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{
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public event EventHandler CanExecuteChanged;
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public bool CanExecute(object parameter)
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{
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TreeNode node = (parameter as TreeNode);
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EmployeeInfo emp = node.Item as EmployeeInfo;
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if (emp != null)
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if (emp.ReportsTo == -1 || emp.ReportsTo == 34 || emp.ReportsTo == 36 || emp.ReportsTo == 65)
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return true;
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return false;
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}
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public void Execute(object parameter)
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{
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TreeNode node = (parameter as TreeNode);
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EmployeeInfo emp = node.Item as EmployeeInfo;
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if (emp != null)
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{
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node.PopulateChildNodes((App.Current.MainWindow.DataContext as ViewModel).GetReportees(emp.ID));
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}
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}
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}
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}

‎CS/MainWindow.xaml‎

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<syncfusion:ChromelessWindow x:Class="OnDemandLoading.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:I="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
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xmlns:local="clr-namespace:OnDemandLoading"
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xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
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syncfusion:LayoutControl.SetMetroMode="True"
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Icon="App.ico"
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WindowStartupLocation="CenterScreen">
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<syncfusion:ChromelessWindow.DataContext>
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<local:ViewModel />
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</syncfusion:ChromelessWindow.DataContext>
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<Grid>
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<syncfusion:LayoutControl HeaderDescriptionText="This sample exposes the On-demand loading of SfTreeGrid."
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HeaderText="On-demand Loading"
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LayoutMode="Metro"
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UserOptionsVisibility="Visible">
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<syncfusion:LayoutControl.GridView>
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<syncfusion:SfTreeGrid Name="treeGrid"
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AutoGenerateColumns="False"
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LoadOnDemandCommand="{Binding CommandLoad}"
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ItemsSource="{Binding EmployeeDetails}">
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<syncfusion:SfTreeGrid.Columns>
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<syncfusion:TreeGridTextColumn HeaderText="First Name" MappingName="FirstName" />
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<syncfusion:TreeGridTextColumn HeaderText="Employee ID"
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MappingName="ID"
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TextAlignment="Left" />
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<syncfusion:TreeGridTextColumn HeaderText="Last Name" MappingName="LastName" />
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<syncfusion:TreeGridTextColumn MappingName="Title" />
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<syncfusion:TreeGridCurrencyColumn MappingName="Salary" />
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<syncfusion:TreeGridTextColumn HeaderText="Reports To" MappingName="ReportsTo" />
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</syncfusion:SfTreeGrid.Columns>
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</syncfusion:SfTreeGrid>
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</syncfusion:LayoutControl.GridView>
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<syncfusion:LayoutControl.UserOptionsView>
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<syncfusion:UserOptions HeaderText="Options">
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<StackPanel x:Name="StkPanel" Margin="6">
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<Button Margin="5"
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Command="local:ExpandCommand.ExpandAll"
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CommandTarget="{Binding GridView,
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RelativeSource={RelativeSource Mode=FindAncestor,
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AncestorType={x:Type syncfusion:LayoutControl}}}"
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Content="Expand All Nodes" />
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<Button Margin="5"
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Command="local:CollapseCommand.CollapseAll"
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CommandTarget="{Binding GridView,
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RelativeSource={RelativeSource Mode=FindAncestor,
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AncestorType={x:Type syncfusion:LayoutControl}}}"
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Content="Collapse All Nodes" />
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</StackPanel>
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</syncfusion:UserOptions>
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</syncfusion:LayoutControl.UserOptionsView>
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</syncfusion:LayoutControl>
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</Grid>
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</syncfusion:ChromelessWindow>

‎CS/MainWindow.xaml.cs‎

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#region Copyright Syncfusion Inc. 2001 - 2016
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// Copyright Syncfusion Inc. 2001 - 2016. All rights reserved.
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// Use of this code is subject to the terms of our license.
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// A copy of the current license can be obtained at any time by e-mailing
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// licensing@syncfusion.com. Any infringement will be prosecuted under
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// applicable laws.
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#endregion
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using Syncfusion.Windows.Shared;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.Windows.Navigation;
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using System.Windows.Shapes;
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namespace OnDemandLoading
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{
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/// <summary>
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/// Interaction logic for MainWindow.xaml
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/// </summary>
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public partial class MainWindow : ChromelessWindow
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{
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public MainWindow()
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{
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InitializeComponent();
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}
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}
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}

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