TextBox - binding property doesn't refresh itself

Question

I have a textbox which Text property is bound like that

 <TextBox Name="txtBox"> <TextBox.Text> <Binding Path="Data"> </Binding> </TextBox.Text> </TextBox>

The filed Data can be changed in various places in my program. However if I change filed Data in ahother control, the t txtBox Text property does't refresh itself. I still can see the old value(despite the fact that Data filed has been changed). Is there any way to force textbox to refresh itselft or sth?

Mark Bostleman · Accepted Answer · 2010-08-29 14:12:06Z

5

In order for your textbox to know when the data it's bound to changes, the class that it is bound to must implement INotifyPropertyChanged. Below is an example in C#. If you bind a textbox to the property Data, the textbox should update when the Data property's setter is executed. Note that INotifyPropertyChanged will require a reference to the System.ComponentModel namespace (a Using in C# or Imports in VB).

public class MyData : INotifyPropertyChanged { string _data; public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } public string Data { get { return _data; } set { _data = value; this.OnPropertyChanged("Data"); } } }

answered Aug 29, 2010 at 14:12

Mark Bostleman

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5 Comments

pelicano Over a year ago

Thanks for answer. I'll give it a chance :) However I would like to know if there is any way to refresh textbox.text properryy manually. Sth like textbox.refresh() ??

pelicano Over a year ago

One more question. Is there any way to implement this interface and use autoproperty ?? Basicly all properties in my class are implemented this way public DateTime Date { get; set; }

Mark Bostleman Over a year ago

Regarding manual refreshing, it depends on whether you want to do it by accessing the control directly from the view or indirectly from the viewmodel. The example I provided indirectly causes the binding to update from the viewmodel. So it comes down to whenever you raise the OnPropertyChanged event. You can raise the event any time you want - it doesn't necessarily have to be in the setter.

Mark Bostleman Over a year ago

Regarding automatic properties, the compiler creates a private backer and implements the getter and setter for you. I don't know of any other way to raise the OnPropertyChanged when the setter is called without implementing the setter yourself.

pelicano Over a year ago

Once again thanks for answers :) I used INotifyPropertyChange, this is great :)

Chen Kinnrot · Accepted Answer · 2010-08-29 13:37:39Z

does your Data property owner object implement INotifyPropertyChanged? if no than implemet it and fire PropertyChanged When your set property is called

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