datagrid behaviors mouse down

PacticeSolution/DataGridEventTriggerSample/App.xaml

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+<Application x:Class="DataGridEventTriggerSample.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:DataGridEventTriggerSample"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

PacticeSolution/DataGridEventTriggerSample/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace DataGridEventTriggerSample
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

PacticeSolution/DataGridEventTriggerSample/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

PacticeSolution/DataGridEventTriggerSample/DataGridEventTriggerSample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.39" />
+  </ItemGroup>
+
+</Project>

PacticeSolution/DataGridEventTriggerSample/MainWindow.xaml

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+<Window x:Class="DataGridEventTriggerSample.MainWindow"
+        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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:DataGridEventTriggerSample" xmlns:viewmodel="clr-namespace:DataGridEventTriggerSample.ViewModel"
+        xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    
+    <Window.DataContext>
+        <viewmodel:StudentViewModel/>
+    </Window.DataContext>
+    
+    <StackPanel>
+        <DataGrid Name="grdMain"
+                  AutoGenerateColumns="True"
+                  IsReadOnly="True"
+                  VerticalAlignment="Stretch"
+                  HorizontalAlignment="Stretch"
+                  ItemsSource="{Binding Students, UpdateSourceTrigger=PropertyChanged}"
+                  ScrollViewer.CanContentScroll="True"
+                  ScrollViewer.HorizontalScrollBarVisibility="Visible"
+                  ScrollViewer.VerticalScrollBarVisibility="Auto">
+            <i:Interaction.Behaviors>
+                <viewmodel:StudentViewModel MouseDownCommand="{Binding MouseDownCommand}"/>
+            </i:Interaction.Behaviors>
+        </DataGrid>
+    </StackPanel>
+</Window>

PacticeSolution/DataGridEventTriggerSample/MainWindow.xaml.cs

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+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 DataGridEventTriggerSample
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

PacticeSolution/DataGridEventTriggerSample/Model/Student.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataGridEventTriggerSample.Model
+{
+    internal class Student
+    {
+        public string Name { get; set; }
+        public int Age { get; set; }
+        public string Address { get; set; }
+    }
+}

PacticeSolution/DataGridEventTriggerSample/ViewModel/StudentViewModel.cs

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+using DataGridEventTriggerSample.Model;
+using Microsoft.Xaml.Behaviors;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace DataGridEventTriggerSample.ViewModel
+{
+    internal class StudentViewModel : Behavior<DataGrid>, INotifyPropertyChanged
+    {
+        public static readonly DependencyProperty MouseDownProperty = DependencyProperty.Register(nameof(MouseDownCommand), typeof(ICommand), typeof(StudentViewModel), new PropertyMetadata(null));
+
+        private ObservableCollection<Student> _students;
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        public StudentViewModel()
+        {
+            this.Students.Add(new Student { Name = "Agent1", Age = 20, Address = "Location1" });
+            this.Students.Add(new Student { Name = "Agent2", Age = 21, Address = "Location2" });
+            this.Students.Add(new Student { Name = "Agent3", Age = 22, Address = "Location3" });
+            this.Students.Add(new Student { Name = "Agent4", Age = 23, Address = "Location4" });
+            this.Students.Add(new Student { Name = "Agent5", Age = 24, Address = "Location5" });
+            this.Students.Add(new Student { Name = "Agent6", Age = 25, Address = "Location6" });
+            this.Students.Add(new Student { Name = "Agent7", Age = 26, Address = "Location7" });
+            this.Students.Add(new Student { Name = "Agent8", Age = 27, Address = "Location8" });
+            this.Students.Add(new Student { Name = "Agent9", Age = 28, Address = "Location9" });
+            this.Students.Add(new Student { Name = "Agent10", Age = 29, Address = "Location10" });
+        }
+
+        public ObservableCollection<Student> Students
+        {
+            get
+            {
+                if (_students == null)
+                    _students = new ObservableCollection<Student>();
+
+                return _students;
+            }
+            set
+            {
+                _students = value;
+                OnPropertyChanged("Students");
+            }
+        }
+
+
+        public ICommand MouseDownCommand
+        {
+            get { return (ICommand)GetValue(MouseDownProperty); }
+            set { SetValue(MouseDownProperty, value); }
+        }
+
+        protected virtual void OnPropertyChanged(string propertyName)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        public void OnDataGridMouseDown(object sender, MouseEventArgs e)
+        {
+            DataGrid? dataGrid = sender as DataGrid;
+            if (dataGrid == null)
+                return;
+            
+            Student? student = dataGrid.SelectedItem as Student;
+            if (student == null) 
+                return;
+
+            for (int i = 0; i < this.Students.Count; i++)
+            {
+                DataGridRow? row = dataGrid.ItemContainerGenerator.ContainerFromIndex(i) as DataGridRow;
+                if (row == null) 
+                    continue;
+
+                SolidColorBrush brush = new SolidColorBrush(Colors.Transparent);
+                if (this.Students[i].Name.Equals(student.Name))
+                    brush = new SolidColorBrush(Colors.LightCoral);
+
+                row.Background = brush;
+            }
+        }
+
+        protected override void OnAttached()
+        {
+            this.AssociatedObject.MouseUp += OnDataGridMouseDown;
+        }
+
+        protected override void OnDetaching()
+        {
+            this.AssociatedObject.MouseUp += OnDataGridMouseDown;
+        }
+    }
+}