WPF 按键绑定到字典中的项目

Question

What I want it to bind TextBoxes to my dictionaries values. I could find some posts about it already but:

One means having my dictionary as context:

XML:

<TextBox x:Name="FirstLine" Text="{Binding Path=[FirstLine]}"/>

XAML:

public ImportProfilesOptions()
{
    InitializeComponent();
    contexte = new ViewModelImportProfilesOptions();
    DataContext = contexte.ParamsData;

}

The other one using Templates :

<ItemsControl x:Name="dictionaryItemsControl" ItemsSource="{Binding dictionary}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Key}" />
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

But I would like to use it, without using Templates (I need to add in labels some translates I take from properties), and without setting my dictionary as context. Something like that:

XML

<TextBox x:Name="FirstLine" Text="{Binding Path=ParamsDate[FirstLine]}" />

XAML

contexte = new ViewModelImportProfilesOptions();
DataContext = contexte;

But then, binding is not working anymore.

Answer 1

You can't do this out of the box, though you could create your own converter I guess:

public class SomeFunkyConverter : IValueConverter
{
   public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
   {
      if (!(value is Dictionary<string,string> dictionary))
         return null;

      if (!(parameter is string key))
         return null;

      return !dictionary.TryGetValue(key, out var result) ? null : result;
   }
   
   // ill leave this up to you
   public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    => throw new NotSupportedException();
}

Usage

<TextBlock Text="{Binding Path=ParamsDate, 
                          ElementName=TextBox, 
                          Converter={StaticResource SomeFunkyConverter},
                          ConverterParameter='Bob'}"/>

_{Note : Completely untested}