情节提要动画错误 [英] Storyboard Animation Error

问题描述

人们:)我正在尝试一个在线学习的教程，该教程根据三个可调节旋转，距离和持续时间的滑块控件来为对象设置动画.这是我后面的代码:

Hi people :) i''m trying a tutorial i found online to animate an object according to three slider controls that adjust rotation, distance and duration. Here''s my code behind :

//address the storyboard by its name
           Storyboard sb = (Storyboard)this.FindResource("RectangleAnimation");

           //search for the two DoubleAnimationUsingKeyFrames elements in the storyboard
           DoubleAnimationUsingKeyFrames translate = (DoubleAnimationUsingKeyFrames)sb.Children[0];
           DoubleAnimationUsingKeyFrames rotate = (DoubleAnimationUsingKeyFrames)sb.Children[1];

           //search for the two splinedoublekeyframe elements in the storyboard
           SplineDoubleKeyFrame translateFrame = (SplineDoubleKeyFrame)translate.KeyFrames[0];
           SplineDoubleKeyFrame rotateFrame = (SplineDoubleKeyFrame)rotate.KeyFrames[0];

           //duration: adjust the property keytime to the value of the slider sldDuration
           translateFrame.KeyTime = new TimeSpan(0, 0, (int)sldDuration.Value);
           rotateFrame.KeyTime = new TimeSpan(0, 0, (int)sldDuration.Value);

           //rotation: adjust the property Value of the rotateFrame to he value of te lsider sldrotation
           rotateFrame.Value = sldRotation.Value;

           //distance:adjust the property value of the translateFrame to the value of the slider sldDistance
           translateFrame.Value = sldDistance.Value;

           //finally start the animation
           sb.Begin(this);

但我在
收到此错误

but i get this error at

 SplineDoubleKeyFrame translateFrame = (SplineDoubleKeyFrame)translate.KeyFrames[0];

saying: Unable to cast object of type ''System.Windows.Media.Animation.EasingDoubleKeyFrame'' to type ''System.Windows.Media.Animation.SplineDoubleKeyFrame''.

谁能告诉我我做错了吗?
谢谢大家

Can anyone tell me what i''m doing wrong?
Thanks all

推荐答案

>>谁能告诉我我做错了什么吗?

尝试将EasingDoubleKeyFrame强制转换为SplineDoubleKeyFrame，就像异常消息状态一样:)

如果您不知道数组中关键帧的类型，则可以使用基类DoubleKeyFrame代替SplineDoubleKeyFrame.

>>Can anyone tell me what i''m doing wrong?

Trying to cast a EasingDoubleKeyFrame to a SplineDoubleKeyFrame, just like the exception message states :)

If you don''t know the type of keyframes that are in the array, then maybe you can use the base class DoubleKeyFrame instead of SplineDoubleKeyFrame.

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