DoubleAnimation.By Property
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
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)
XMLNS for XAML: Not mapped to an xmlns.
Syntax
Public Property By As Nullable(Of Double)
public Nullable<double> By { get; set; }
<DoubleAnimation By="double"/>
Property Value
Type: System..::.Nullable<(Of <(Double>)>)
The total amount by which the animation changes its starting value. The default is nullNothingnullptra null reference (Nothing in Visual Basic).
Remarks
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 |
|---|---|
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. |
|
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. |
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.
To set a DoubleAnimation attribute to null in XAML, use an attribute value of {x:Null}.
Version Information
Windows Phone OS
Supported in: 8.1, 8.0, 7.1, 7.0
Platforms
Windows Phone
See Also
Reference
System.Windows.Media.Animation Namespace