Question

I am having an issue getting my model changes updated back into my viewmodel so i can display. In this example i have a label and a button, when i press the button it will execute some business logic, and should update the label on screen. However, when my model changes the view will not. Any Idea on what i am doing wrong here?

View-

<Window.DataContext>
    <vm:ViewModel>
</Window.DataContext>
<Grid>
    <Label Content="{Binding Path=Name}"/>
    <Button Command={Binding UpdateBtnPressed}/>
</Grid>

ViewModel

public ViewModel()
{
    _Model = new Model();
}

public string Name
{
    get{return _Model.Name;}
    set
    {
        _Model.Name = value;
        OnPropertyChanged("Name");
    }
}

public ICommand UpdateBtnPressed
{
get{
_UpdateBtn = new RelayCommand(param => UpdateLabelValue());
return _UpdateBtn;
}

private void UpdateLabelValue()
{
    _Model.Name = "Value Updated";
}

Model

private string name = "unmodified string";

public string Name
{
    get{return name;}
    set{name = value;}
}

Answer 1

Try this:

private void UpdateLabelValue()
{
  Name = "Value Updated";
}