XAML: Bind IsChecked to list object using an enum to index

Question

I've read through probably 20 different posts and still can put together what I'm looking to do (maybe I'm going about it the wrong way?).

I want to make a window with a few checkboxes. These checkboxes need to have their IsChecked value bound to a member variable of an object in a List.

I'm trying something like this:

XAML

<CheckBox IsChecked="{Binding Features[0].Selected, Mode=TwoWay}">
    <TextBlock Text="Feature 1" />
</CheckBox>
<CheckBox IsChecked="{Binding Features[1].Selected, Mode=TwoWay}">
    <TextBlock Text="Feature 2" />
</CheckBox>

ViewModel

  public static enum MyFeatureEnum
  {
     FEATURE1,
     FEATURE2,
     FEATURE3,
     ...
  }

  public class Feature : INotifyPropertyChanged
  {
     private bool _supported;
     private bool _visible;
     private bool _selected;
     public MyFeatureEnum FeatureEnum { get; set; }

     public bool Supported
     {
        get { return _supported; }
        set { _supported = value; NotifyPropertyChanged("Supported"); }
     }
     public bool Visible
     {
        get { return _visible; }
        set { _visible = value; NotifyPropertyChanged("Visible"); }
     }
     public bool Selected
     {
        get { return _selected; }
        set { _selected = value; NotifyPropertyChanged("Selected"); }
     }

     public Feature(MyFeatureEnum featureEnum)
     {
        _supported = false;
        _visible = false;
        _selected = false;
        FeatureEnum = featureEnum;
     }

     public event PropertyChangedEventHandler PropertyChanged;
     private void NotifyPropertyChanged(string propertyName)
     {
        if (PropertyChanged != null)
        {
           PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
     }
  }

  public List<Feature> Features { get; set; }

  public InstallViewModel()
  {
     ...
     // Generate the list of features
     Features = new List<Feature>();
     foreach (MyFeatureEnum f in Enum.GetValues(typeof(MyFeatureEnum)))
     {
        Features.Add(new Feature(f));
     }
     ...
  }

This works.

What I want is to replace:

<CheckBox IsChecked="{Binding Features[0].Selected, Mode=TwoWay}">

with something like:

<CheckBox IsChecked="{Binding Features[InstallViewModel.MyFeatureEnum.FEATURE1].Selected, Mode=TwoWay}">

Is this possible?

score 1 · Accepted Answer · answered Aug 08 '17 at 09:27

Is this possible?

Not using a List<Feature> but you could use a Dictionary<MyFeatureEnum, Feature>:

public class InstallViewModel
{
    public Dictionary<MyFeatureEnum, Feature> Features { get; set; }

    public InstallViewModel()
    {
        // Generate the list of features
        Features = new Dictionary<MyFeatureEnum, Feature>();
        foreach (MyFeatureEnum f in Enum.GetValues(typeof(MyFeatureEnum)))
        {
            Features.Add(f, new Feature(f));
        }
    }
}

<CheckBox IsChecked="{Binding Features[FEATURE1].Selected, Mode=TwoWay}" />

Hallelujah! It really was that simple :D – jbudreau Aug 08 '17 at 17:27 — jbudreau, Aug 08 '17 at 17:27

XAML: Bind IsChecked to list object using an enum to index

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