CODEWITHSUNDEEP
c#wpfxamlcheckbox
DaveDev
DaveDev

Reputation: 42215

How to dynamically check CheckBoxes?

I'm generating CheckBoxes dynamically and I want to check them depending on which options should be selected.

I have the following XAML:

        <StackPanel>
            <StackPanel x:Name="ArmingPanel" />
        </StackPanel>

And the following code:

    private void AddCheckBoxes(OptionsVM options)
    {
        var converter = new FlagsEnumValueConverter();
        foreach (Arming arming in Enum.GetValues(typeof(Arming)))
        {
            if (arming != Arming.None)
            {

                var binding = new Binding()
                {
                    Path = new PropertyPath("Arming"),
                    Converter = converter,                        
                    ConverterParameter = arming
                };

                var checkBox = new CheckBox()
                                   {
                                       Content = arming.ToString(),
                                       IsChecked = (options.Options.Arming & arming) != Arming.None
                                   };

                checkBox.SetBinding(CheckBox.IsCheckedProperty, binding);
                ArmingPanel.Children.Add(checkBox);
            }
        }
    }

Depending on which flags have been set, the following should be set to true or false:

IsChecked = (options.Options.Arming & arming) != Arming.None

I can see this value being set correctly when I debug, but when the checkboxes are listed on the screen they're always unchecked.

How can I get them to be checked as expected?

Upvotes: 0

Views: 644

Answers (2)

rfmodulator
rfmodulator

Reputation: 3738

EDIT: This isn't an asnwer to the OP's question, but I feel it deserves mentioning.

It appears that you're checking for enum flags, the proper boolean expression is:

(options.Options.Arming & arming) == arming

if this expression returns true, then options.Options.Arming contains the flag stored in arming

It is also important that your enum Arming members be defined correctly!

Upvotes: -1

Dean Chalk
Dean Chalk

Reputation: 20471

In calling you CheckBox constructor you set IsChecked, which sets the IsCheckedProperty on the checkbox. You then set the IsCheckedProperty again with a Binding, so the first setting is overridden.

I suspect your issue is with the Converter and the ConverterParameter in the Binding

Upvotes: 2

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