I am new to WPF and I’ve been breaking my head over this for past couple of days. I am trying to set a basic binding of textbox to a string property. I followed the MS tutorial but nothing seems to be working.
Here's email class, I am trying to bind its subject property to display in a textbox
public class Email : INotifyPropertyChanged
{
private string _subject;
public string Subject
{
get { return _subject; }
set
{
_subject = value;
OnPropertyChanged("Subject");
}
}
private string _contents;
public string Contents
{
get { return _contents; }
set
{
_contents = value;
OnPropertyChanged("Contents");
}
}
private Category _category;
public Category Category
{
get { return _category; }
set
{
_category = value;
OnPropertyChanged("Category");
}
}
public Email()
{
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string info)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(info));
}
}
}
Here's the email setter inside UserControl that parents the textbox:
private Email _email;
public Email Email
{
get { return _email; }
set
{
_email = value;
if (_email != null)
{
Binding myBinding = new Binding("Subject");
myBinding.Source = _email;
tbSubject.SetBinding(TextBlock.TextProperty, myBinding);
}
}
}
tbSubject is never getting set to anything, its always empty even if email passed is not null and has a subject! If I do just this:
public Email Email
{
get { return _email; }
set
{
_email = value;
if (_email != null)
{
tbSubject.Text = _email.Subject;
}
}
}
it works fine. I dont understand what I am doing wrong.
Pravesh Singh
24-Sep-2013I think I've got it. Here's the change I had to make:
So I changed source to "this" and made the user control implement INotifyPropertyChanged. Now it works.
Alternatively I got it working through XAML
<TextBox x:Name="tbSubject" Grid.Column="1" Grid.Row="1" Margin="3" Text="{Binding Email.Subject}"/>