<Window x:Class="WpfPrism.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:WpfPrism"
     mc:Ignorable="d"
     xmlns:prism="http://prismlibrary.com/"
     prism:ViewModelLocator.AutoWireViewModel="True"
     Title="MainWindow" Height="450" Width="800">

     <Grid>
          <Grid.RowDefinitions>
               <RowDefinition Height="*" />
               <RowDefinition Height="Auto" />
          </Grid.RowDefinitions>

          <ListView
               ItemsSource="{Binding Customers}"
               SelectedItem="{Binding SelectedCustomer}" />

          <Button
               Grid.Row="1" Width="80" Height="40"
               Command="{Binding CommandLoad}"
               Content="LOAD" />
     </Grid>

</Window>

using Prism.Commands;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfPrism.ViewModels
{
     public class MainWindowViewModel : BindableBase
     {
          private Services.ICustomerStore _customerStore = null;

          public MainWindowViewModel(Services.ICustomerStore customerStore)
          {
               _customerStore = customerStore;
          }


          public ObservableCollection<string> Customers { get; private set; } =
               new ObservableCollection<string>();


          private string _selectedCustomer = null;
          public string SelectedCustomer
          {
               get => _selectedCustomer;
               set
               {
                    if (SetProperty<string>(ref _selectedCustomer, value))
                    {
                         Debug.WriteLine(_selectedCustomer ?? "no customer selected");
                    }
               }
          }

          private DelegateCommand _commandLoad = null;
          public DelegateCommand CommandLoad =>
               _commandLoad ?? (_commandLoad = new DelegateCommand(CommandLoadExecute));

          private void CommandLoadExecute()
          {
               Customers.Clear();
               List<string> list = _customerStore.GetAll();
               foreach (string item in list)
                    Customers.Add(item);
          }
     }
}

using System.Collections.Generic;

namespace WpfPrism.Services
{
     public interface ICustomerStore
     {
          List<string> GetAll();
     }

     public class DbCustomerStore : ICustomerStore
     {
          public List<string> GetAll()
          {
               return new List<string>()
               {
                    "cust 1",
                    "cust 2",
                    "cust 3",
               };
          }
     }

}

<prism:PrismApplication
     x:Class="WpfPrism.App"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="clr-namespace:WpfPrism"
     xmlns:prism="http://prismlibrary.com/">

     <Application.Resources>
     </Application.Resources>

</prism:PrismApplication>

using Prism.Ioc;
using Prism.Unity;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using WpfPrism.Services;

namespace WpfPrism
{
     /// <summary>
     /// Interaction logic for App.xaml
     /// </summary>
     public partial class App : PrismApplication
     {
          protected override void RegisterTypes(IContainerRegistry containerRegistry)
          {
               containerRegistry.Register<ICustomerStore, DbCustomerStore>();
               containerRegistry.RegisterForNavigation<MainWindow, ViewModels.MainWindowViewModel>();
          }

          protected override Window CreateShell()
          {
               var w = Container.Resolve<MainWindow>();
               return w;
          }
     }
}