通知属性更改的字典 [英] Notify Property Changed on a Dictionary

问题描述

我有一个WPF / XAML表单数据绑定到一个属性在一本字典，类似这样的：

I have a WPF / XAML form data-bound to a property in a dictionary, similar to this:

<TextBox Text="{Binding Path=Seat[2B].Name}">

座椅公开为一个属性的IDictionary<弦乐，预订方式> 飞机对象

Seat is exposed as a property IDictionary<String, Reservation> on the airplane object.

class airplane
{
    private IDictionary<String, Reservation> seats;
    public IDictionary<String, Reservation> Seat
    {
        get { return seats; }
        // set is not allowed
    }
}

从我的窗口的代码中，座椅2B的价值有时会改变，而在这之后，我想通知该属性已更改的用户界面。

From within the code of my Window, the value of seat 2B is sometimes changed, and after that, I want to notify the UI that the property has changed.

class MyWindow : Window
{
    private void AddReservation_Click(object sender, EventArgs e)
    {
        airplane.Seat["2B"] = new Reservation();
        // I want to override the assignment operator (=)
        // of the Seat-dictionary, so that the airplane will call OnNotifyPropertyChanged.
    }
}

我已经看了，看字典是的IObservable ，这样我就可以观察到的变化，但它似乎并不如此。

I've looked to see if the Dictionary is IObservable, so that I could observe changes to it, but it doesn't seem to be.

有什么好办法抓的转变，以在飞机类的字典，这样我就可以 NotifyPropertyChanged 。

Is there any good way to "catch" changes to the dictionary in the airplane-class so that I can NotifyPropertyChanged.

推荐答案

博士。 WPF已经创建了一个 ObservableDictionary 在此链接： http://drwpf.com/blog/2007/09/16/can-i-bind-my-itemscontrol-to-a-dictionary/

Dr. WPF has created an ObservableDictionary at this link: http://drwpf.com/blog/2007/09/16/can-i-bind-my-itemscontrol-to-a-dictionary/

更新： 通过WPF博士在下面的链接提出的意见说，他有这么以下变应不再是固定这个问题自己需要的

此外，加法这个链接被做了：的 http://10rem.net/blog/2010/03/08/binding-to-a-dictionary-in-wpf-and-silverlight

Also, an addition was made at this link: http://10rem.net/blog/2010/03/08/binding-to-a-dictionary-in-wpf-and-silverlight

小的变化是

// old version
public TValue this[TKey key]
{
    get { return (TValue)_keyedEntryCollection[key].Value; }
    set { DoSetEntry(key, value);}
}

// new version
public TValue this[TKey key]
{
    get { return (TValue)_keyedEntryCollection[key].Value; }
    set
    {
        DoSetEntry(key, value);
        OnPropertyChanged(Binding.IndexerName);
    }
}

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