WPF data binding to dictionary with enum key

Question

I have a solution with a couple of projects. In one project, is my model that has an enum called ModelEnum.

Then in my WPF project I have a ViewModel which has a Dictionary.

And in my ViewModel I have my ValuesDictionary setup as:

    private Dictionary<ModelEnum, string> _valuesDictionary = new Dictionary<ModelEnum, string>();

    public Dictionary<ModelEnum, string> ValuesDictionary
    {
        get { return _valuesDictionary; }
        set { _valuesDictionary = value; OnPropertyChanged(_valuesDictionary); }
    }

In my XAML I have:

xmlns:model="clr-namespace:Model.Data;assembly=Model"
...
<TextBox Text="{Binding Path=ValuesDictionary[(model:ModelEnum)ModelEnum.Enum1].Value}" HorizontalAlignment="Left" Height="29" Margin="90,82,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="50"/>

The following XAML snippet:

(model:ModelEnum)ModelEnum.Enum1

is giving me the error "Parameter type mismatch." I'm confused because I thought I was casting this to the Enum type that it was expecting. I referenced this SO question to try it with no luck.

Taran · Accepted Answer · 2014-10-28 02:41:42Z

8

replace

(model:ModelEnum)ModelEnum.Enum1].Value

with

(model:ModelEnum)Enum1]

Then try. I hope it will work.

edited Oct 28, 2014 at 2:41

answered Oct 27, 2014 at 22:30

Taran

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3 Comments

King King Over a year ago

I think you mean replace the whole [(model:ModelEnum)ModelEnum.Enum1].Value (Note about the .Value) with [(model:ModelEnum)Enum1]. Otherwise the OP may think the new expression is [(model:ModelEnum)Enum1].Value which won't work.

user1097108 Over a year ago

That was it. Thanks! For some reason the xaml editor is still showing a red squiggly line underneath it, but when I tested it, all was good.

Ric .Net Over a year ago

@Taran: pfff, I spent all afternoon debugging this. Couldn't find a good answer anywhere until I finally found this! Thanx!

ack · Accepted Answer · 2014-12-16 15:42:34Z

5

Just to add to the potential pitfalls with this, I had issues binding without the explicit "Path="

i.e.

{Binding ValuesDictionary[(model:ModelEnum)Enum1]}

doesn't work, but:

{Binding Path=ValuesDictionary[(model:ModelEnum)Enum1]}

works as expected, although the designer (or maybe ReSharper) still complains about syntax errors.

answered Dec 16, 2014 at 15:42

ack

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