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 ...

Validation By IDataErrorInfo in Wpf using MVVM

<Window x:Class="WpfPrismTutorial.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:WpfPrismTutorial"
        mc:Ignorable="d"
        prism:ViewModelLocator.AutoWireViewModel="True"
        xmlns:prism="http://prismlibrary.com/"
        xmlns:valid="clr-namespace:WpfPrismTutorial.Validations"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <ControlTemplate x:Key="errorTemplate">
            <StackPanel Orientation="Horizontal">
            <AdornedElementPlaceholder x:Name="ErrorHolder" >
                <Border BorderBrush="red" BorderThickness="1" />
            </AdornedElementPlaceholder>
            <TextBlock  Text="{Binding [0].ErrorContent}" VerticalAlignment="Center" HorizontalAlignment="Right" Foreground="Red"/>
        </StackPanel>

        </ControlTemplate>
    </Window.Resources>
    <Grid VerticalAlignment="Center" HorizontalAlignment="Left">

        <StackPanel Orientation="Horizontal" Grid.Row="3">
            <TextBlock Text="Validation by IDataErrorInfo  " Margin="5,5"/>
            <TextBox Text="{Binding MainWindowModel.ValidationByIDataErrorInfo,UpdateSourceTrigger=PropertyChanged,
                        ValidatesOnDataErrors=True}" Validation.ErrorTemplate="{StaticResource errorTemplate}"  Height="30" Width="300"/>
        </StackPanel>
    </Grid>

</Window>

ViewModel

 public class MainWindowViewModel : BindableBase
    {
        private MainWindowModel mainWindowModel = new MainWindowModel();

        public MainWindowModel MainWindowModel
        {
            get { return mainWindowModel; }
            set { SetProperty(ref mainWindowModel, value); }
        }
 }

Model

  public class MainWindowModel : BindableBase, IDataErrorInfo
    {
        #region Validation By IDataErrorInfo

        private string _validationByIDataErrorInfo = string.Empty;

        public string ValidationByIDataErrorInfo
        {
            get { return _validationByIDataErrorInfo; }
            set
            {
                SetProperty(ref _validationByIDataErrorInfo, value);
            }
        }
        #endregion


        public string Error { get; }

        public string this[string columnName]
        {
            get
            {
                if (columnName == "ValidationByIDataErrorInfo")
                    return "Validation By IDataErrorInfo should not empty";
                return string.Empty;
            }
        }
    }

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