DoubleAnimation.By Property

Definition

Namespace:

System.Windows.Media.Animation

Assembly:

PresentationCore.dll

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

public:
 property Nullable<double> By { Nullable<double> get(); void set(Nullable<double> value); };

public double? By { get; set; }

member this.By : Nullable<double> with get, set

Public Property By As Nullable(Of Double)

Property Value

Nullable<Double>

The total amount by which the animation changes its starting value. The default value is null.

Remarks

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

The following table summarizes how the From, To, and By properties may 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.

Note

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.

XAML Attribute Usage

<object By="Double"/>

-or-

<object By="{}"/>

Dependency Property Information

Identifier field	ByProperty
Metadata properties set to true	None

See also

• From
• To