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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Easy way of navigate using Prism in WPF

1.First.xaml



<UserControl x:Class="PrismMain.Views.First"

             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:PrismMain.Views"

             mc:Ignorable="d"

             xmlns:prism="http://prismlibrary.com/"

        prism:ViewModelLocator.AutoWireViewModel="True">

    <StackPanel>

          <Button Content="Navigate To Second" Margin="5"  Command="{Binding NavigateCommand}" Width="150"/>

    </StackPanel>



</UserControl>


First.xaml.cs

public partial class First: UserControl

    {

        public First(FirstViewModel viewModel)

        {

            InitializeComponent();

            DataContext = viewModel;

        }



    }
FirstViewModel

 

  class FirstViewModel

    {

        public FirstViewModel(IRegionManager iregionManager)

        {
             NavigateCommand = new DelegateCommand(Nevigate);

            IregionManager = iregionManager;

        }



        private void Nevigate()

        {

            IregionManager.RequestNavigate("MainContent", "Second");

        }


        public ICommand NavigateCommand { get; }

        public IRegionManager IregionManager { get; }


    }

2.Second.xaml

 

<UserControl x:Class="PrismMain.Views.Second"

             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:PrismMain.Views"

             mc:Ignorable="d"

             xmlns:prism="http://prismlibrary.com/"

        prism:ViewModelLocator.AutoWireViewModel="True">

    <StackPanel>

          <Button Content="Navigate To First" Margin="5"  Command="{Binding NavigateCommand}" Width="150"/>

    </StackPanel>



</UserControl>

Second.xaml.cs

public partial class Second: UserControl

    {

        public First(SecondViewModel viewModel)

        {

            InitializeComponent();

            DataContext = viewModel;

        }



    }


SecondViewModel

 

  class SecondViewModel

    {

        public SecondViewModel(IRegionManager iregionManager)

        {

            

            NavigateCommand = new DelegateCommand(Nevigate);

            IregionManager = iregionManager;

        }



        private void Nevigate()

        {

            IregionManager.RequestNavigate("MainContent", "First");

        }



       

        public ICommand NavigateCommand { get; }

        public IRegionManager IregionManager { get; }



    }

To navigate between these Views we need to register these views, for this we need to Implement IModule interface.

Here's how you can implement it:



 class MainModule : IModule

    {

        public void OnInitialized(IContainerProvider containerProvider)

        {

            var region = containerProvider.Resolve<IRegionManager>();

            region.RegisterViewWithRegion("MainContent", typeof(Main));

          //here i register the MainContent region of Main.xaml

        }



        public void RegisterTypes(IContainerRegistry containerRegistry)

        {

      

            containerRegistry.RegisterForNavigation<First>();

            containerRegistry.RegisterForNavigation<Second>();

          

        }



    }

Here MainContent is region name which is present in Main.xaml where these views are navigated.


Main.xaml

    

<metro:MetroWindow x:Class="PrismMain.Views.Main"



        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:PrismMain.Views"



        mc:Ignorable="d"



        xmlns:prism="http://prismlibrary.com/"



        xmlns:metro="http://metro.mahapps.com/winfx/xaml/controls" >



<Grid>



     <ContentControl prism:RegionManager.RegionName="MainContent" />



 </Grid>

</metro:MetroWindow>

Now time to configure Module to do this we need to override ConfigureModuleCatalog method inside App.xaml.cs

App.xaml.cs






 public partial class App



    {



     



        protected override Window CreateShell()



        {



            var shell = Container.Resolve<Main>();//where Main is a window to display on start up which present in view folder



            return shell;



        }



       



        protected override void RegisterTypes(IContainerRegistry containerRegistry)



        {



            



            



        }



        protected override void ConfigureModuleCatalog(IModuleCatalog moduleCatalog)



        {



            base.ConfigureModuleCatalog(moduleCatalog);



            moduleCatalog.AddModule<MainModule>();



        }



    }



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