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 Exception (Display Error message by ToolTip) in Wpf using MVVM

View

<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">

    <Grid VerticalAlignment="Center" HorizontalAlignment="Left">
     
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="Validation by Exception" Margin="5,5"/>
             <TextBox Text="{Binding MainWindowModel.ValidationByException,UpdateSourceTrigger=PropertyChanged,
                        ValidatesOnExceptions=True}" x:Name="txt"  Height="30" Width="300">
                <TextBox.Style>
                    <Style TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
                        <Style.Triggers>
                            <Trigger  Property="Validation.HasError" Value="true">
                                <Setter Property="ToolTip" Value="Invalid input"/>
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </TextBox.Style>
            </TextBox>
        </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
    {
        #region Validation By Exception

        private string _validationByException = string.Empty;

        public string ValidationByException
        {
            get { return _validationByException; }
            set

            {
                if (string.IsNullOrEmpty(value))
                    throw new Exception("Validation By Exception should not empty");
                SetProperty(ref _validationByException, value);
            }
        }
        #endregion
    }

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