更改 DoubleAnimation From 属性

Question

我已经定义了带有 DoubleAnimation 的 Storyboard，并且在开始动画之前我需要更改代码隐藏中的 From 值。我该怎么做？

这不起作用 - 我收到异常Object reference not set to an instance of an object。

<Storyboard x:Key="SB_showhide" Duration="0:0:1">
    <DoubleAnimation x:Name="move" Storyboard.TargetProperty="(Window.Left)" From="0" To="500" />
</Storyboard>

((DoubleAnimation)FindName("move")).From = 200;
BeginStoryboard((Storyboard)FindResource("SB_showhide"));

Answer 1

这应该有效：

var storyboard = (Storyboard)Resources["SB_showhide"];
var move = (DoubleAnimation)storyboard.Children[0];
move.From = 200;