Through the oldWinForm I realizeda small andsimple application that usesthe Entity Framework6.
There are 3Textbox: ID, Name, Surnameand a Button.
Model:
[Table("Customer")]
public partial class Customer
{
public int ID { get; set; }
[StringLength(50)]
public string Name { get; set; }
[StringLength(50)]
public string Surname { get; set; }
}This is the code:
namespace WindowsForms
{
public partial class MainForm : Form
{
private MyContext _ctx;
public MainForm()
{
InitializeComponent();
}
private void onLoad(object sender, EventArgs e)
{
_ctx = new MyContext();
}
private void button1_Click(object sender, EventArgs e)
{
customerBindingSource.DataSource = _ctx.Customers.Find(1);
}
}
}My goalis to transformthe codein WPFwithMVVMLight.
Then I openeda new project andinstalled theMVVM Lightpattern:
<Window x:Class="MvvmLightForms.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:ignore="http://www.ignore.com"
mc:Ignorable="d ignore"
Height="300"
Width="300"
Title="MVVM Light Application"
DataContext="{Binding Main, Source={StaticResource Locator}}"><Window.Resources><ResourceDictionary><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="Skins/MainSkin.xaml" /></ResourceDictionary.MergedDictionaries></ResourceDictionary></Window.Resources><Grid x:Name="LayoutRoot"><TextBlock FontSize="36"
FontWeight="Bold"
Foreground="Purple"
Text="{Binding WelcomeTitle}"
VerticalAlignment="Center"
HorizontalAlignment="Center"
TextWrapping="Wrap" /><Button Content="Button" Command="{Binding LoadCommand}" HorizontalAlignment="Left" Margin="26,22,0,0" VerticalAlignment="Top" Width="75"/><TextBox HorizontalAlignment="Left" Height="23" Margin="26,68,0,0" TextWrapping="Wrap" Text="{Binding Path=Id}" VerticalAlignment="Top" Width="120"/><TextBox HorizontalAlignment="Left" Height="23" Margin="26,96,0,0" TextWrapping="Wrap" Text="{Binding Path=Name}" VerticalAlignment="Top" Width="120"/><TextBox HorizontalAlignment="Left" Height="23" Margin="26,124,0,0" TextWrapping="Wrap" Text="{Binding Path=Surname}" VerticalAlignment="Top" Width="120"/></Grid></Window>MainViewModel:
namespace MvvmLightForms.ViewModel
{
/// <summary>
/// This class contains properties that the main View can data bind to.
/// <para>
/// See http://www.galasoft.ch/mvvm
/// </para>
/// </summary>
public class MainViewModel : ViewModelBase
{
private Customer _customer;
private MyContext _ctx;
private RelayCommand loadCommand;
public ICommand LoadCommand
{
get
{
if (loadCommand == null)
loadCommand = new RelayCommand(() => Load());
return loadCommand;
}
}
private void Load()
{
_customer = _ctx.Customers.Find(1);
}
public MainViewModel()
{
if (IsInDesignMode)
{
// Code runs in Blend --> create design time data.
}
else
{
// Code runs "for real"
_ctx = new MyContext();
}
}
}
}Howeverit worksonly inpart.In the sensethatthe code willcompileproperly (withouterrors),butdoes not behavelikeWinforms.What should Iadd?(or correct?)