Bind Button command from viewmodel sample added.

README.md

@@ -1 +1,3 @@
-# how-to-bind-button-command-to-view-model-in-wpf-and-uwp-treegrid-in-mvvm
+# how-to-bind-button-command-to-view-model-in-wpf-and-uwp-treegrid-in-mvvm
+
+This example illustrates to bind the button command to ViewModel in treegrid.

UWP/App.xaml

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+<Application
+    x:Class="SfTreeGridDemo.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:syncfusion="using:Syncfusion.UI.Xaml.TreeGrid"
+    xmlns:local="using:SfTreeGridDemo"
+    RequestedTheme="Light">
+
+</Application>

UWP/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+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;
+
+namespace SfTreeGridDemo
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    sealed partial class App : Application
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            Microsoft.ApplicationInsights.WindowsAppInitializer.InitializeAsync(
+                Microsoft.ApplicationInsights.WindowsCollectors.Metadata |
+                Microsoft.ApplicationInsights.WindowsCollectors.Session);
+            this.InitializeComponent();
+            this.Suspending += OnSuspending;
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="e">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+
+#if DEBUG
+            if (System.Diagnostics.Debugger.IsAttached)
+            {
+                this.DebugSettings.EnableFrameRateCounter = false;
+            }
+#endif
+
+            Frame rootFrame = Window.Current.Content as Frame;
+
+            // Do not repeat app initialization when the Window already has content,
+            // just ensure that the window is active
+            if (rootFrame == null)
+            {
+                // Create a Frame to act as the navigation context and navigate to the first page
+                rootFrame = new Frame();
+
+                rootFrame.NavigationFailed += OnNavigationFailed;
+
+                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
+                {
+                    //TODO: Load state from previously suspended application
+                }
+
+                // Place the frame in the current Window
+                Window.Current.Content = rootFrame;
+            }
+
+            if (rootFrame.Content == null)
+            {
+                // When the navigation stack isn't restored navigate to the first page,
+                // configuring the new page by passing required information as a navigation
+                // parameter
+                rootFrame.Navigate(typeof(MainPage), e.Arguments);
+            }
+            // Ensure the current window is active
+            Window.Current.Activate();
+        }
+
+        /// <summary>
+        /// Invoked when Navigation to a certain page fails
+        /// </summary>
+        /// <param name="sender">The Frame which failed navigation</param>
+        /// <param name="e">Details about the navigation failure</param>
+        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
+        }
+
+        /// <summary>
+        /// Invoked when application execution is being suspended.  Application state is saved
+        /// without knowing whether the application will be terminated or resumed with the contents
+        /// of memory still intact.
+        /// </summary>
+        /// <param name="sender">The source of the suspend request.</param>
+        /// <param name="e">Details about the suspend request.</param>
+        private void OnSuspending(object sender, SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+            //TODO: Save application state and stop any background activity
+            deferral.Complete();
+        }
+    }
+}

UWP/ApplicationInsights.config

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+<?xml version="1.0" encoding="utf-8"?>
+<ApplicationInsights xmlns = "http://schemas.microsoft.com/ApplicationInsights/2013/Settings">
+</ApplicationInsights>

UWP/Helpers/Command.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace SfTreeGridDemo
+{
+    public class RelayCommand : ICommand
+    {
+        // Event that fires when the enabled/disabled state of the cmd changes
+        public event EventHandler CanExecuteChanged;
+
+        // Delegate for method to call when the cmd needs to be executed        
+        private readonly Action<object> _targetExecuteMethod;
+
+        // Delegate for method that determines if cmd is enabled/disabled        
+        private readonly Predicate<object> _targetCanExecuteMethod;
+
+        public bool CanExecute(object parameter)
+        {
+            return _targetCanExecuteMethod == null || _targetCanExecuteMethod(parameter);
+        }
+
+        public void Execute(object parameter)
+        {
+            // Call the delegate if it's not null
+            if (_targetExecuteMethod != null) _targetExecuteMethod(parameter);
+        }
+
+        public RelayCommand(Action<object> executeMethod, Predicate<object> canExecuteMethod = null)
+        {
+            _targetExecuteMethod = executeMethod;
+            _targetCanExecuteMethod = canExecuteMethod;
+        }
+
+        public void RaiseCanExecuteChanged()
+        {
+            if (CanExecuteChanged != null) CanExecuteChanged(this, EventArgs.Empty);
+        }
+    }
+}

UWP/MainPage.xaml

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+<Page x:Class="SfTreeGridDemo.MainPage"
+      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+      xmlns:local="using:SfTreeGridDemo"
+      xmlns:utils="using:Syncfusion.UI.Xaml.Utils"
+      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+      xmlns:syncfusion="using:Syncfusion.UI.Xaml.TreeGrid"
+      mc:Ignorable="d">
+    <Page.DataContext>
+        <local:ViewModel />
+    </Page.DataContext>
+
+    <Grid>
+
+        <syncfusion:SfTreeGrid Name="treeGrid"
+                                       AutoExpandMode="RootNodesExpanded"
+                                       AutoGenerateColumns="False" 
+                                       AllowEditing="True"
+                                       SelectionMode="Extended"
+                                       ShowRowHeader="True"
+                                       SelectedItem="{Binding SelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                                       ChildPropertyName="Children"
+                                       ColumnSizer="Star" 
+                                       ExpanderColumn="FirstName"
+                                       ItemsSource="{Binding PersonDetails}"
+                                       >
+            <syncfusion:SfTreeGrid.Columns>
+                <syncfusion:TreeGridTextColumn HeaderText="First Name" 
+
+                                               MappingName="FirstName" >
+
+                </syncfusion:TreeGridTextColumn>
+                <syncfusion:TreeGridTextColumn MappingName="Id" TextAlignment="Left" >
+
+                </syncfusion:TreeGridTextColumn>
+                <syncfusion:TreeGridTextColumn HeaderText="Last Name" MappingName="LastName" />
+                <syncfusion:TreeGridTemplateColumn HeaderText="Click Action" MappingName="Cake" >
+                    <syncfusion:TreeGridTemplateColumn.CellTemplate>
+                        <DataTemplate>
+                            <Button  Content="Click"  
+                                     Command="{Binding Path=DataContext.RowDataCommand,ElementName=treeGrid}" CommandParameter="{Binding}"/>
+                        </DataTemplate>
+                    </syncfusion:TreeGridTemplateColumn.CellTemplate>
+                </syncfusion:TreeGridTemplateColumn>
+            </syncfusion:SfTreeGrid.Columns>
+
+        </syncfusion:SfTreeGrid>
+
+    </Grid>
+</Page>

UWP/MainPage.xaml.cs

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+using Syncfusion.Data;
+using Syncfusion.UI.Xaml.Grid;
+using Syncfusion.UI.Xaml.Grid.Helpers;
+using Syncfusion.UI.Xaml.TreeGrid;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.InteropServices.WindowsRuntime;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.Storage;
+using Windows.Storage.Pickers;
+using Windows.UI;
+using Windows.UI.Core;
+using Windows.UI.Popups;
+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.Media.Imaging;
+using Windows.UI.Xaml.Navigation;
+using Key = Windows.System.VirtualKey;
+
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
+
+namespace SfTreeGridDemo
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        public MainPage()
+        {
+            this.InitializeComponent();
+        }
+    }
+}