WPF Binding to Class Property

Question

I have xaml file:

<TextBox Text="{Binding Student.SName, Mode=TwoWay}"/>
<TextBox Text="{Binding Student.Name, Mode=TwoWay}"/>

And my Definition to this xaml file:

public Model.Student Student { get; set; }

And the Student Class which is in the property:

public class Student : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
       if (PropertyChanged != null)
       {
           PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
       }
    }

    private string _SName;
    private string _Name;

    public string SName
    {
        get { return _SName; }
        set
        {
            if (_SName != value)
            {
                _SName = value;
                OnPropertyChanged("SName");
            }
        }
    }

    public string Name
    {
        get { return _Name; }
        set
        {
            if (_Name != value)
            {
               _Name = value;
               OnPropertyChanged("Name");
            }
        }
    }
}

What can I do, to change the value in the Student-Property automatically when entering text?

@EhsanSajjad When i add info in .cs file View Update, but When i write text in TextBox it's doesn't update for me;( — goodniko, Feb 18 '16 at 17:59
@Peter i open windows as View.AddStudent add = new View.AddStudent(); add.DataContext = new AddStudentViewModel(); add.ShowDialog(); — goodniko, Feb 18 '16 at 18:12
Set the `UpdateSourceTrigger` property of the Bindings to `PropertyChanged`. It is `LostFocus` by default, which will trigger an update of the binding source (i.e. the view model) property only when the TextBox loses focus. — Clemens, Feb 18 '16 at 18:22
@Clemens thx so match but can i give me some sample for this? — goodniko, Feb 18 '16 at 18:44
`Text="{Binding Student.Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"` — Clemens, Feb 18 '16 at 18:55
Just to clarify, you have an `AddStudentViewModel` class which contains a property for `Student`? And this is the property you are saying is not updating? Because in your question you say the definition of the `Student` property is in the XAML, which makes me think your DataContext is not setup correctly, and you are probably looking at two separate instances of the `Student` object. — Rachel, Feb 18 '16 at 19:27
@Rachel i write public Model.Student Student { get; set; } = new Model.Student(); and it's work! ;) Thanks!) — goodniko, Feb 18 '16 at 19:50
@user3588235 Be sure you understand what the DataContext is used for if you're working with WPF :) Here's one SO answer I wrote explaining it which you may find useful : http://stackoverflow.com/a/7262322/302677 — Rachel, Feb 18 '16 at 19:58

WPF Binding to Class Property

0 Answers0