CODEWITHSUNDEEP
c#wpfxaml
Fka
Fka

Reputation: 6234

XAML bind dictionary item with variable key

I'd like to bind dictionary's item using variable as a key, for example:

PanelNames.cs

public static class PanelNames
{
    public static string Panel1 = "Panel1";

    public static string Panel2 = "Panel2";
}

MainWindowVM.cs

IDictionary<string, object> Panels { get; }

MainWindow.xaml

<TextBlock Content="{Binding Panels[Panel1]}" /> <-- this works fine, because Panel1 is simply string

<TextBlock Content="{Binding Panels[PanelNames.Panel1]}" /> <-- this doesn't work, because there is no key with such name, but I want to keep names outside XAML file and use PanelNames static class.

Is this possible to access Dictionary element using variable as a key in XAML? I saw this post, but it doesn't meet my requirements.

Upvotes: 2

Views: 1837

Answers (1)

fhnaseer
fhnaseer

Reputation: 7277

Instead of hardcoding a string in the XAML, you should bind this to another property:

View

<TextBlock Content="{Binding PanelValue}" />

ViewModel

IDictionary<string, object> Panels { get; }

private string _panelValue;
public string PanelValue
{
    get { return Panels[_panelValue]; }
    set
    {
        // Make sure Panels has this key,
        _panelValue = value;
        OnPropertyChanged(nameof(PanelValue));
    }
}

So in your code, you can set PanelValue to the key whose value you want to display in the TextBlock.

Upvotes: 2

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