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DoubleAnimation.By Property

Gets or sets the total amount by which the animation changes its starting value.

Namespace:  System.Windows.Media.Animation
Assembly:  System.Windows (in System.Windows.dll)
public Nullable<double> By { get; set; }
<DoubleAnimation By="double"/>

Property Value

Type: System.Nullable<Double>
The total amount by which the animation changes its starting value. The default is null.

Dependency property identifier field: ByProperty

Use the By property when you want to animate a value "by" a certain amount, rather than specifying a starting or ending value. You can also use the By property with the From property.

The following table summarizes how the From, To, and By properties can be used together or separately to determine an animation's target values.

Properties specified

Resulting behavior

From

The animation progresses from the value specified by the From property to the base value of the property being animated or to a previous animation's output value, depending on how the previous animation is configured.

From and To

The animation progresses from the value specified by the From property to the value specified by the To property.

From and By

The animation progresses from the value specified by the From property to the value specified by the sum of the From and By properties.

To

The animation progresses from the animated property's base value or a previous animation's output value to the value specified by the To property.

By

The animation progresses from the base value of the property being animated or a previous animation's output value to the sum of that value and the value specified by the By property.

NoteNote:

If you set both the To and By properties, the To property takes precedence and the By property is ignored.

To use other interpolation methods or animate between more than two target values, use a DoubleAnimationUsingKeyFrames object.

To set a DoubleAnimation attribute to null in XAML, use an attribute value of {x:Null}.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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