Xây dựng project chuẩn MVVM trong Phần mềm quản lý kho WPF - MVVM

<Application x:Class="QuanLyKho.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:QuanLyKho"
             
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
                <ResourceDictionary Source="/ResourceXAML/MainResource.xaml"></ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>
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using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace QuanLyKho
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
    }
}
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<Window x:Class="QuanLyKho.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:QuanLyKho"
        mc:Ignorable="d"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        TextElement.Foreground="{DynamicResource MaterialDesignBody}"
     TextElement.FontWeight="Regular"
     TextElement.FontSize="13"
     TextOptions.TextFormattingMode="Ideal"
     TextOptions.TextRenderingMode="Auto"
     Background="{DynamicResource MaterialDesignPaper}"
     FontFamily="{DynamicResource MaterialDesignFont}"
        DataContext="{StaticResource MainVM}"
        Title="MainWindow" Height="500" Width="525">
    <Grid>
       
    </Grid>
</Window>
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace QuanLyKho
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        //http://materialdesigninxaml.net/home
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}
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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:viewmodel="clr-namespace:QuanLyKho.ViewModel"
                    xmlns:local="clr-namespace:QuanLyKho.ResourceXAML">
    <viewmodel:MainViewModel x:Key="MainVM"></viewmodel:MainViewModel>
</ResourceDictionary>
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace QuanLyKho.ViewModel
{
    public class BaseViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
    class RelayCommand<T> : ICommand
    {
        private readonly Predicate<T> _canExecute;
        private readonly Action<T> _execute;

        public RelayCommand(Predicate<T> canExecute, Action<T> execute)
        {
            if (execute == null)
                throw new ArgumentNullException("execute");
            _canExecute = canExecute;
            _execute = execute;
        }

        public bool CanExecute(object parameter)
        {
            try
            {
                return _canExecute == null ? true : _canExecute((T)parameter);
            }
            catch
            {
                return true;
            }
        }

        public void Execute(object parameter)
        {
            _execute((T)parameter);
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
    }
}
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace QuanLyKho.ViewModel
{
    public class MainViewModel : BaseViewModel
    {
        // mọi thứ xử lý sẽ nằm trong này
        public MainViewModel()
        {
            MessageBox.Show("Đã vào trong MainViewModel -> DataContext của mainwindow.xaml");
        }
    }
}
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