<Window x:Class="Test_MVVM.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:Test_MVVM"
		xmlns:Duc="clr-namespace:ViewModel;assembly=ViewModel"
		xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        mc:Ignorable="d"
		x:Name="MainW"
		WindowStartupLocation="CenterScreen"
        Title="MainWindow" Height="450" Width="800">
	<Window.DataContext>
		<Duc:DIENVIENVIEWMODEL></Duc:DIENVIENVIEWMODEL>
	</Window.DataContext>
	<StackPanel>
		<ListView x:Name="lv1" ItemsSource="{Binding Listdienvien}">
			<ListView.View>
				<GridView>
					<GridViewColumn Header="Mã diễn viên">
						<GridViewColumn.CellTemplate>
							<DataTemplate>
								<TextBlock Text="{Binding ID}"></TextBlock>
							</DataTemplate>
						</GridViewColumn.CellTemplate>
					</GridViewColumn>
					<GridViewColumn Header="Tên diễn viên">
						<GridViewColumn.CellTemplate>
							<DataTemplate>
								<TextBlock Text="{Binding TenDienVien}"></TextBlock>
							</DataTemplate>
						</GridViewColumn.CellTemplate>
					</GridViewColumn>
				</GridView>
			</ListView.View>
		</ListView>
		<TextBlock></TextBlock>
		<StackPanel>
			<TextBlock Text="Mã diễn viên"></TextBlock>
			<TextBox x:Name="txtID" Text="{Binding SelectedValue.ID, ElementName=lv1,Mode=OneWay}"></TextBox>
			<TextBlock Text="Tên diễn viên"></TextBlock>
			<TextBox x:Name="txtName" Text="{Binding SelectedValue.TenDienVien, ElementName=lv1,Mode=OneWay}"></TextBox>
		</StackPanel>
		<StackPanel Orientation="Horizontal">
			<Button Content="Thêm" Command="{Binding AddCommand}"></Button>
	    </StackPanel>
</Window>
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using Model;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace ViewModel
{
    public class MainWindowViewModel
    {
        ObservableCollection<DIENVVIEN> listdienvien;
        private string _TenDienVien;
        public string TenDienVien { get => _TenDienVien; set => _TenDienVien = value; }
        public ObservableCollection<DIENVVIEN> Listdienvien { get => listdienvien; set => listdienvien = value; }

        public DIENVIENVIEWMODEL()
        {
            Listdienvien = new ObservableCollection<DIENVVIEN>(DataProvider.Instance.Data.DIENVVIENs);
            AddCommand = new RelayCommand<object>((p) =>
            {
                ///Kiểm tra thuộc tính cần thêm khác rỗng
                if (string.IsNullOrEmpty(TenDienVien))
                {
                    return false;
                }
                //Kiểm tra thuộc tính cần thêm chưa tồn tại trong danh sách
                var dienvien = DataProvider.Instance.Data.DIENVVIENs.Where(x => x.TenDienVien == TenDienVien);
                if (dienvien == null || dienvien.Count() != 0)
                {
                    return false;
                }
                return true;
            }, (p) => { Add(p); });
        }

        public ICommand AddCommand { get; set; }


        void Add(object p)
        {
            var dienvien = new DIENVVIEN() { TenDienVien = TenDienVien };
            DataProvider.Instance.Data.DIENVVIENs.InsertOnSubmit(dienvien);
            DataProvider.Instance.Data.SubmitChanges();
            Listdienvien.Add(dienvien);
        }
    }
}
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