DependencyProperty Default Value

Question

I'm trying to get a DependencyProperty working in WPF. I'm using:

public static readonly DependencyProperty DisplayModeProperty = DependencyProperty.Register("DisplayMode", typeof (TescoFoodSummary), typeof (Orientation), new UIPropertyMetadata(Orientation.Vertical));
    /// <summary>
    /// Gets or sets the orientation.
    /// </summary>
    /// <value>The orientation.</value>
    public Orientation DisplayMode {
        get { return (Orientation)base.GetValue(DisplayModeProperty); }
        set { base.SetValue(DisplayModeProperty, value); }
    }

When I initialize the window, I get an error: Default value type does not match type of property 'DisplayMode'. Howevere, if I leave the default value out I get a null reference exception when the window loads due to DisplayModeProperty not being set.

The second parameter is the property type, the third parameter is the type of the control, be attentive, swap them in your example. — vortexwolf, May 05 '11 at 14:06

score 13 · Accepted Answer · edited Feb 10 '14 at 16:16

13

Posting comment as an answer.

According to msdn DependencyProperty.Register Method the syntax looks so:

public static DependencyProperty Register(
    string name,
    Type propertyType,
    Type ownerType,
    PropertyMetadata typeMetadata
)

In your case ownerType is TescoFoodSummary and propertyType is Orientation, so parameters have the following positions:

DependencyProperty.Register("DisplayMode", typeof (Orientation), typeof (TescoFoodSummary), new UIPropertyMetadata(Orientation.Vertical));

edited Feb 10 '14 at 16:16

VansFannel

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answered Aug 27 '12 at 09:59

vortexwolf

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Thanks, an easy mistake to make. – Echilon Aug 28 '12 at 17:39

DependencyProperty Default Value

1 Answers1