WPF Databinding Magic

Question

I have an ObservableCollection <Foo> which is associated with an ItemsControl (basically displays a list).

Foo basically looks like this (there are other members, but it does not implement any interfaces or events):

class Foo
{
  public string Name { get; set; }
  //...
}

When the user clicks on an item, I open a dialog box in which the user can edit the Foo properties (tied to a small view model using the Foo property for the selected item), Xaml looks like this:

<TextBox Text="{Binding Foo.Name,Mode=TwoWay}"
    Grid.Column="1" Grid.Row="0" Margin="2" />

It's really strange when a user edits a name, the value in the list changes! (not during input, but after the focus leaves the field)

How it's done? I did not implement the INotifyPropertyChanged interface on a Foo object!

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: casperOne ! , 404:

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Answer 1

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Answer 2

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Answer 3

Because they are attached to one object. If you change the binding to

{Binding Foo.Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}

then they will be synchronized when the user enters text in the text box.