Binding to indexer

[asmirnov82]

Hello,

I would like to create a view model, that implements 'string this[string key] { get; set; }' indexing or provides property Values that implements it. In my view I use binding to this indexer:

<TextBox	Text="{Binding [Text1]}"/>

or

<TextBox	Text="{Binding Values[Text1]}"/>

That works fine and correct values are shown.

But now I need to change the value for [Text1] or Values[Text1] and trigger NotifyPropertyChanged event by calling PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(property));.

What name should I use as property to make it work? I tried different onces without any success

[msneijders]

This could work:

class ViewModel: INotifyPropertyChanged
{
    Dictionary<string, string> _items = new Dictionary<string, string>()
    {
        { "key1", "value1" },
        { "key2", "value2" },
        { "key3", "value3" },
    };

    public string this[string key]
    {
        get
        {
            return _items[key];
        }

        set
        {
            _items[key] = value;
            base.OnPropertyChanged("Item");
        }
    }
}

In xaml:

<TextBox Text="{Binding [key1]}" />

So using Item as property name.

In avalonia code in AvaloniaDictionary, I also see the use of "Item[key1]", but I could not get it to work using that.

[asmirnov82]

@msneijders, thank you for such quick answer. This works!