How Dependency Injection Containers Work in C#?

Dependency Injection (DI) containers, such as Unity or DryIoc, help manage the creation and lifetime of object dependencies in C#. They facilitate the Inversion of Control (IoC) principle, allowing you to focus on writing clean, maintainable code without worrying about the complexities of instantiating dependencies manually. How DI Containers Work? Registration:  You define which concrete classes should be used to fulfill specific interface contracts. This allows the DI container to know what to instantiate when a class requests a particular dependency. Resolution:  When an instance of a class is requested, the DI container looks at the registered services, resolves the dependencies, and creates the object with the required dependencies injected. Lifetime Management:  The container manages the lifecycle of the dependencies. You can specify whether instances should be singleton (one instance for the entire application), transient (a new instance each time), or scoped (one ...
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How to edit selected row of DataGrid and add the new row to DataGrid

MainWindow.xaml

<Window x:Class="WpfEx.Views.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:WpfEx"
       mc:Ignorable="d">
  <StackPanel>

<DataGrid ItemsSource="{Binding LstStudents}" SelectedItem="{Binding SelectedStudent}" AutoGenerateColumns="False" Height="200" Width="200" HorizontalAlignment="Left">
           <DataGrid.Columns>
               <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
               <DataGridTextColumn Header="Roll" Binding="{Binding Roll}"/>
           </DataGrid.Columns>
       </DataGrid>
       <Button Content="Edit Selected row" Command="{Binding EditSelectedRowCommand}" HorizontalAlignment="Left" Width="150"/>
       <Button Content="Add row" Command="{Binding AddRowCommand}" HorizontalAlignment="Left" Width="150"/>
</StackPanel>
</Window>

MainWindow.xaml.cs

  public partial class MainWindow : Window
   {
     
       public MainWindow()
       {
           InitializeComponent();
             DataContext= new MainWindowViewModel(); 
       }

   }

MainWindowViewModel.cs

 public class MainWindowViewModel : BindableBase
   {
       public MainWindowViewModel()
       {
           EditSelectedRowCommand = new DelegateCommand(EditRow);
           AddRowCommand = new DelegateCommand(AddRow);

    LstStudents =new ObservableCollection<Student>
           {
               new Student
               {
                   Name="ABC",
                   Roll=1
               },
               new Student
               {
                   Name="DEF",
                   Roll=2
               }
           };         
       }

       private void AddRow()
       {
           var studentToAdd = new Student();
           var addWindow = new Add(studentToAdd);
         
           var window = new Window
           {
               Title = "Add Student",
               Content = addWindow
           };

           addWindow.AddStudent.Click += (s, e) =>
     {
      LstStudents.Add(studentToAdd);
     window.Close();
    };
   
           window.Show();
       }

       private void EditRow()
       {
    var editWindow = new Window
           {
               Title="Edit Selected Student",
               Content = new Edit(SelectedStudent)
           };
           editWindow.Show();
       }

       private ObservableCollection<Student> _lstStudents =
    new ObservableCollection<Student>();

       public ObservableCollection<Student> LstStudents
       {
           get { return _lstStudents; }
           set { SetProperty(ref _lstStudents, value); }
       }

       private Student _selectedStudent=new Student();

       public Student SelectedStudent
       {
           get { return _selectedStudent; }
           set { SetProperty(ref _selectedStudent ,value); }
       }

       public ICommand EditSelectedRowCommand { get; set; }
       public ICommand AddRowCommand { get; set; }

}

Student.cs

public partial class Student
   {

       public int Roll { get; set; }
       public string Name { get; set; }
   }

Add.xaml

<UserControl x:Class=" WpfEx.Views.Add"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
            xmlns:local="clr-namespace: WpfEx.Views"
            mc:Ignorable="d" >
   <Grid>
       <Grid.RowDefinitions>
           <RowDefinition Height="40"/>
           <RowDefinition Height="40"/>
           <RowDefinition Height="40"/>
       </Grid.RowDefinitions>
       <Grid.ColumnDefinitions>
           <ColumnDefinition Width="100"/>
           <ColumnDefinition Width="*"/>
       </Grid.ColumnDefinitions>
       <TextBlock Text="Name : "/>
       <TextBox Width="200" Text="{Binding Name}" Grid.Column="1" Margin="5" HorizontalAlignment="Left"/>
     
       <TextBlock Text="Roll : " Grid.Row="1"/>
       <TextBox Width="200" Text="{Binding Roll}"  Grid.Column="1" Grid.Row="1" Margin="5"  HorizontalAlignment="Left"/>
       <Button Content="Add" x:Name="AddStudent" Grid.Column="1" Grid.Row="2" HorizontalAlignment="Right" x:FieldModifier="public" Margin="5" Width="150"/>

   </Grid>
</UserControl>

Add.xaml.cs

public partial class Add : UserControl
   {
       public Add(Student student)
       {
           InitializeComponent();
           DataContext = student;
       }
   }

Edit.xaml

<UserControl x:Class=" WpfEx.Views.Edit"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
            xmlns:local="clr-namespace: WpfEx.Views"
            mc:Ignorable="d"
            d:DesignHeight="450" d:DesignWidth="800">
   <Grid>
       <Grid.RowDefinitions>
           <RowDefinition Height="40"/>
           <RowDefinition Height="40"/>
       </Grid.RowDefinitions>
       <Grid.ColumnDefinitions>
           <ColumnDefinition Width="100"/>
           <ColumnDefinition Width="*"/>
       </Grid.ColumnDefinitions>
       <TextBlock Text="Name : "/>
       <TextBox Width="200" Text="{Binding Name}" Grid.Column="1" Margin="5" HorizontalAlignment="Left"/>
     
       <TextBlock Text="Roll : " Grid.Row="1"/>
       <TextBox Width="200" Text="{Binding Roll}"  Grid.Column="1" Grid.Row="1" Margin="5"  HorizontalAlignment="Left"/>
   </Grid>
</UserControl>

Edit.xaml.cs

public partial class Edit : UserControl
   {
       public Edit(Student student)
       {
           InitializeComponent();
           DataContext = student;
       }
   }

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