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QuestionUpdate Instance Property From DP Pin
Kevin Marois29-Apr-14 6:29
professionalKevin Marois29-Apr-14 6:29 
I have a DP called FullName. When it changes, I need to parse it and add it to an instance property of type List<<string>> FileAsOptions.

So, when I have

"Joe Smith"

or

"Smith, Joe"

they both get added to the list property.

The FullName property is a DP, and the FileAsOptions is an instance property. It's not a DP because I don't want it to be bindable.

So the FullName DP's change callback calls a private method that parses the name and add it to the instance list

The problem is that the instance property needs to call RaisePropertyChanged, which only works on instance properties. So the property cannot be static.

Here's the code:

public partial class ContactCard : _UserControlBase
{
    public ContactCard()
    {
        InitializeComponent();
        LayoutRoot.DataContext = this;
    }

    private List<string> _FileAsOptions;
    public List<string> FileAsOptions
    {
        get { return _FileAsOptions; }
        set
        {
            if (_FileAsOptions != value)
            {
                _FileAsOptions = value;
                RaisePropertyChanged("FileAsOptions");
            }
        }
    }

    public string FullName
    {
        get { return (string)GetValue(FullNameProperty); }
        set { SetValue(FullNameProperty, value); }
    }

    public static readonly DependencyProperty FullNameProperty = DependencyProperty.Register(
        "FullName", typeof(string), typeof(ContactCard),
        new FrameworkPropertyMetadata("", new PropertyChangedCallback(OnFullNamePropertyChanged)));

    private static void OnFullNamePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        var card = sender as ContactCard;

        // ========== THIS DOESN'T COMPILE ==========
        //setFileAsOptions(card.FullName);
    }        
        
    private void setFileAsOptions(string fullName)
    {
        FileAsOptions = new List<string>();

        if (!string.IsNullOrEmpty(fullName))
        {
            string[] words = fullName.Split(' ');

            if (words.Length == 1)
            {
                FileAsOptions.Add(words[0]);
            }

            if (words.Length == 2)
            {
                FileAsOptions.Add(string.Format("{0} {1}", words[0], words[1]));
                FileAsOptions.Add(string.Format("{0}, {1}", words[1], words[0]));
            }

            // Other options here...
        }
    }
}


In summary, I need to be able to call the setFileAsOptions from the DP, which is static.

What's the right approach here?
If it's not broken, fix it until it is

AnswerRe: Update Instance Property From DP Pin
Richard Deeming29-Apr-14 6:34
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GeneralRe: Update Instance Property From DP Pin
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QuestionWPF Style Question Pin
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