WPF Dependency Property Error

Question

I am trying to define a dependency property like this:

public static readonly DependencyProperty DependencyPropertyName= DependencyProperty.Register("DepName", typeof(EnumName), typeof(MyWindow1), new FrameworkPropertyMetadata("FrameWorkProperty", FrameworkPropertyMetadataOptions.AffectsRender, Target));

private static void Target(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
    //some logic here
}

public EnumName DepName
{
    get { return (EnumName)GetValue(DependencyPropertyName); }
    set { SetValue(DependencyPropertyName, value); }
}

And i get this error, and dont understand why:

{"Default value type does not match type of property 'DepName'."}

This may help: stackoverflow.com/questions/20398751/…

Behrad Farsi
– Behrad Farsi

2014-02-13 08:26:52 +00:00
Commented Feb 13, 2014 at 8:26 — Behrad Farsi
– Behrad Farsi, Commented Feb 13, 2014 at 8:26

Eirik · Accepted Answer · 2014-02-13 08:41:08Z

1

The default value type (String) of your Dependency Property does not match the Type of your property DepName (EnumName).

Change the default type in your dependency property and it should work.

public static readonly DependencyProperty DependencyPropertyName= DependencyProperty.Register(
    "DepName", 
    typeof(EnumName), 
    typeof(MyWindow1), 
    new FrameworkPropertyMetadata(
        EnumName.SomeValue, // this is the defalt value
        FrameworkPropertyMetadataOptions.AffectsRender, 
        Target));

answered Feb 13, 2014 at 8:41

Eirik

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4 Comments

Rock3rRullz Over a year ago

Thank you for help, i don't know how i miss that :(

Eirik Over a year ago

It's easy to go blind on your own code from time to time. All you need is to get away from your code a bit and get back with fresh eyes. Lunch usually does the trick for me ;)

Clemens Over a year ago

Please note also that there are naming conventions for dependency property identifier fields. Yours should be called DepNameProperty instead of DependencyPropertyName. Please see the Dependency Property Name Conventions section in Checklist for Defining a Dependency Property on MSDN.

Rock3rRullz Over a year ago

That was just an example :)

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