Chain of DataBinding
- by Neir0
Hello
I am trying to do follow DataBinding
Property -> DependencyProperty -> Property
But i have trouble.
For example,
We have simple class with two properties implements INotifyPropertyChanged:
public class MyClass : INotifyPropertyChanged
{
private string _num1;
public string Num1
{
get { return _num1; }
set
{
_num1 = value;
OnPropertyChanged("Num1");
}
}
private string _num2;
public string Num2
{
get { return _num2; }
set
{
_num2 = value;
OnPropertyChanged("Num2");
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string e)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(e));
}
}
And TextBlock declared in xaml:
<TextBlock Name="tb" FontSize="20" Foreground="Red" Text="qwerqwerwqer" />
Now lets trying to bind Num1 to tb.Text:
private MyClass _myClass = new MyClass();
public MainWindow()
{
InitializeComponent();
Binding binding1 = new Binding("Num1")
{
Source = _myClass,
Mode = BindingMode.OneWay
};
Binding binding2 = new Binding("Num2")
{
Source = _myClass,
Mode = BindingMode.TwoWay
};
tb.SetBinding(TextBlock.TextProperty, binding1);
//tb.SetBinding(TextBlock.TextProperty, binding2);
var timer = new Timer(500) {Enabled = true,};
timer.Elapsed += (sender, args) => _myClass.Num1 += "a";
timer.Start();
}
It works well. But if we uncomment this string
tb.SetBinding(TextBlock.TextProperty, binding2);
then TextBlock display nothing. DataBinding doesn't work! How can i to do what i want?
