WPF databinding not working

Question

private MyObject _myObject; public MyObject MyObject { get { return _myObject; } set { if (_myObject != value) { _myObject = value; RaisePropertyChanged(() => MyObject); } } } <TextBox Text="{Binding MyObject.MyObjectProperty}"/>

When starting my app, MyObject is initialized, the MyObjectProperty is shown in my TextBox, but when I change the MyObjectProperty of MyObject, the TextBox is not updated!

Does your MyObject also raise property changed notifications? — Suresh
– Suresh, Commented May 29, 2013 at 12:44
Do you mean if MyObject also implements INotifyPropertyChanged? If yes the answer is no, MyObject is a Model object, only my ViewModels implement the INotifyPropertyChanged. — Stacked
– Stacked, Commented May 29, 2013 at 12:48
To make your code work, you need to implement INotifyPropertyChanged on MyObject as well - refer to @blindmeis answer — Suresh
– Suresh, Commented May 29, 2013 at 12:57
If your posted code is accurate then you've missed something: your binding doesn't match your property name (MyObjectProperty vs MyObject). Which is it and what else have you missed? — Dan Puzey
– Dan Puzey, Commented May 29, 2013 at 13:00
try the '_myObject = value;' before the if-operator in your property. sometimes it's working, then there is something wrong :D — dennis schütz
– dennis schütz, Commented May 29, 2013 at 13:01

blindmeis · Accepted Answer · 2013-05-29 12:46:38Z

does your MyObject object implement INotifyPropertyChanged and call it?

public class MyObject { private string _prop; public string MyObjectProperty { get { return _prop; } set { if (_prop!= value) { _prop = value; RaisePropertyChanged(() => MyObjectProperty); } } } }

and the default UpdateSourceTrigger is LostFocus so you have to leave the textbox to see anything

Jordan Parmer · Accepted Answer · 2013-05-29 13:04:00Z

0

In addition to what blindmeis said, make sure you also specify two way binding on the textbox.

<TextBox Text="{Binding Path=MyObject.MyProperty, Mode=TwoWay"}/>

answered May 29, 2013 at 13:04

Jordan Parmer

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2 Comments

Stacked Over a year ago

You don't need it, Controls like TextBox have default TwoWay mode.

Jordan Parmer Over a year ago

@Stacked - Good point and that is true for WPF. Silverlight, on the other hand, does not default it. I always forget which settings apply to which technology. :)

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