Modifier un Customer dans my DataGrid

Bonjour,

J'ai un MainWindow contient DataGrid et aussi un Button Edit,

XAML:

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
<DataGrid x:Name="EmpDataGrid"
                  Grid.Row="1"
                  AutoGenerateColumns="False"                     
                  ItemsSource="{Binding loadDataBinding,Mode=TwoWay}"
 
    SelectedItem="{Binding CurrentCustomer}" Grid.ColumnSpan="2">
 
<DataGrid.Columns>
 
                <DataGridTextColumn Header="CustmorID" Binding="{Binding ID}" />
                <DataGridTextColumn Header="CustmorNom" Binding="{Binding nom}" />
                <DataGridTextColumn Header="CustmorPrenom" Binding="{Binding prenom}" />
                <DataGridTextColumn Header="CustmorReference" Binding="{Binding reference}" />
            </DataGrid.Columns>
 
 <Button 
            Content="Edit"                
           Command="{Binding Edit}"
           CommandParameter="{Binding CurrentCustomer}" />

Puis je clique sur la bouton Edit to modifier une customer selectionné, XAML Window Edit :

Code:

1
2
3
4
<Button Command="{Binding UpdateCustomer}" 
  <TextBox x:Name="nom" Text="{Binding CustomerToAddObject.nom,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" />        
    <TextBox x:Name="prenom" Text="{Binding CustomerToAddObject.prenom,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ></TextBox>        
    <TextBox x:Name="reference" Text="{Binding CustomerToAddObject.reference,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ></TextBox>

ViewModel:

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
class ViewModel1 : ViewModelBase
{        
    Test1Entities context = new Test1Entities();     
  public ViewModel1()
    { using (Test1Entities context = new Test1Entities())
        {
            _loadDataBinding = new ObservableCollection<Custmor>(context.Custmor.ToList());
        }
        edit = new RelayCommand(start);           
        CustomerToAddObject = new Custmor();                
        updateCustomer = new RelayCommand(UpdateFunction);              
    }
 
     private ICommand edit;
      public ICommand Edit
    {
        get
        {
            return edit;
        }
    }
 
 
	//To call Update Window:
 
	private void start(object obj) {
      Update windowUpdate = new Update();
       windowUpdate.Show();
   }
 
   private ICommand updateCustomer;
    public ICommand UpdateCustomer
    {
        get { return updateCustomer; }
    }            
 
    private void UpdateFunction(object obj)
    {
        MessageBox.Show(currentCustomer.nom);
        MessageBox.Show(customerToAddObject.nom);
        using (Test1Entities context = new Test1Entities())
        {
            Custmor cus = context.Custmor.Find(currentCustomer.ID);
            cus.nom = customerToAddObject.nom;
            cus.prenom = customerToAddObject.prenom;
            cus.reference = customerToAddObject.reference;
 
            context.SaveChanges();
        }
    }
 
 
     // customerToAddObject
    private Custmor customerToAddObject;
    public Custmor CustomerToAddObject
    {
        get { return customerToAddObject; }
        set { customerToAddObject = value; }
    }
 
 
    //CurrentCustomer  
    private Custmor currentCustomer;
    public Custmor CurrentCustomer
    {
    get { return currentCustomer; }
        set
        {   currentCustomer = value;
            OnPropertyChanged("CurrentCustomer");
        }  
}

Quand* j'exécute,j'ai cette erreur:
Pièce jointe 278026

Et ceci la première exécution de mon application, et l'affichage est correcte depuis ma base de données:Pièce jointe 278030

Merci pour votre aide d'avance,

Modifier un Customer dans my DataGrid - WPF MVVM