 type of a custom attached property

The type that is used as the value type of a custom attached property affects the usage, the definition, or both the usage and definition. The attached property's value type is declared in several places: in the signatures of both the **Get** and **Set** accessor methods, and also as the *propertyType* parameter of the [**RegisterAttached**](https://msdn.microsoft.com/library/windows/apps/hh701833) call.

The most common value type for attached properties (custom or otherwise) is a simple string. This is because attached properties are generally intended for XAML attribute usage, and using a string as the value type keeps the properties lightweight. Other primitives that have native conversion to string methods, such as integer, double, or an enumeration value, are also common as value types for attached properties. You can use other value types—ones that don't support native string conversion—as the attached property value. However, this entails making a choice about either the usage or the implementation:

- You can leave the attached property as it is, but the attached property can support usage only where the attached property is a property element, and the value is declared as an object element. In this case, the property type does have to support XAML usage as an object element. For existing Windows Runtime reference classes, check the XAML syntax to make sure that the type supports XAML object element usage.
- You can leave the attached property as it is, but use it only in an attribute usage through a XAML reference technique such as a **Binding** or **StaticResource** that can be expressed as a string.

## More about the **Canvas.Left** example

In earlier examples of attached property usages we showed different ways to set the [**Canvas.Left**](https://msdn.microsoft.com/library/windows/apps/hh759771) attached property. But what does that change about how a [**Canvas**](https://msdn.microsoft.com/library/windows/apps/br209267) interacts with your object, and when does that happen? We'll examine this particular example further, because if you implement an attached property, it's interesting to see what else a typical attached property owner class intends to do with its attached property values if it finds them on other objects.

The main function of a [**Canvas**](https://msdn.microsoft.com/library/windows/apps/br209267) is to be an absolute-positioned layout container in UI. The children of a **Canvas** are stored in a base-class defined property [**Children**](https://msdn.microsoft.com/library/windows/apps/br227514). Of all the panels **Canvas** is the only one that uses absolute positioning. It would've bloated the object model of the common [**UIElement**](https://msdn.microsoft.com/library/windows/apps/br208911) type to add properties that might only be of concern to **Canvas** and those particular **UIElement** cases where they are child elements of a **UIElement**. Defining the layout control properties of a **Canvas** to be attached properties that any **UIElement** can use keeps the object model cleaner.

In order to be a practical panel, [**Canvas**](https://msdn.microsoft.com/library/windows/apps/br209267) has behavior that overrides the framework-level [**Measure**](https://msdn.microsoft.com/library/windows/apps/br208952) and [**Arrange**](https://msdn.microsoft.com/library/windows/apps/br208914) methods. This is where **Canvas** actually checks for attached property values on its children. Part of both the **Measure** and **Arrange** patterns is a loop that iterates over any content, and a panel has the [**Children**](https://msdn.microsoft.com/library/windows/apps/br227514) property that makes it explicit what's supposed to be considered the child of a panel. So the **Canvas** layout behavior iterates through these children, and makes static [**Canvas.GetLeft**](https://msdn.microsoft.com/library/windows/apps/br209269) and [**Canvas.GetTop**](https://msdn.microsoft.com/library/windows/apps/br209270) calls on each child to see whether those attached properties contain a non-default value (default is 0). These values are then used to absolutely position each child in the **Canvas** available layout space according to the specific values provided by each child, and committed using **Arrange**.

The code looks something like this pseudocode:

``` syntax
    protected override Size ArrangeOverride(Size finalSize)
    {
        foreach (UIElement child in Children)
        {
            double x = (double) Canvas.GetLeft(child);
            double y = (double) Canvas.GetTop(child);
            child.Arrange(new Rect(new Point(x, y), child.DesiredSize));
        }
        return base.ArrangeOverride(finalSize); 
        // real Canvas has more sophisticated sizing
    }
```

**Note**  For more info on how panels work, see [XAML custom panels overview](https://msdn.microsoft.com/library/windows/apps/mt228351).

## Related topics

* [**RegisterAttached**](https://msdn.microsoft.com/library/windows/apps/hh701833)
* [Attached properties overview](attached-properties-overview.md)
* [Custom dependency properties](custom-dependency-properties.md)
* [XAML overview](xaml-overview.md)

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