文本更改时启动故事板
我有一个 TextBlock 绑定到我的视图模型上的属性。我有一个故事板，使用不透明度属性淡入和淡出文本。我使用此文本在用户执行操作（成功、错误等）后向用户提供反馈。当视图模型的属性发生更改时，如何启动 StoryBoard？有没有更好的方法来实现这种效果？
I have a TextBlock bound to a property on my view model. I have a StoryBoard with fades the text in and out using the Opacity property. I am using this text to give the user feedback after they have performed an operation(success, error etc). How can I start the StoryBoard when the property changes from my view model? Is there a better way to do this sort of effect?
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抱歉，我不想告诉你——但你想错了。
不要考虑故事板、不透明度和可见性属性。
始终思考“视觉状态”。
您刚刚描述的内容（淡入 TextBlock 以响应某些业务逻辑更改）是使用 VisualStateManager 状态的完美案例。
基本上，您最终会得到一个“Is”状态组，该状态组在满足条件（已实现某些状态）时具有一种状态，在不满足条件时具有另一种状态。
我强烈建议您花 30 分钟观看这些优秀的 Blend VSM 教程视频。
http://expression.microsoft.com/en-ca/cc643423.aspx
特别是“将状态添加到控件”下的 7 分钟视频。
Erwin van dar valk 刚刚发表了一篇精彩的文章，演示了如何根据您的情况从 MVVM 更改 VSM 状态。
http://blogs.msdn.com/erwinvandervalk/archive/2009/10/12/how-to-work-with-animations-in-silverlight-in-the-mvvm-pattern.aspx< /a>
Sorry, I hate to tell it to you - but you're thinking about it wrong.
Don't think in storyboards, Opacity and Visiblity properties.
Always think "Visual States".
What you just described (fading in a TextBlock in response to some business logic change) is a perfect case for using VisualStateManager states.
Basically you'll end up having a "Is" state group that'll have one state for when the condition is met (some state has been achieved) and another for when it's not met.
I strongly suggest you spend 30 minutes watching these excellent Blend VSM tutorial videos.
http://expression.microsoft.com/en-ca/cc643423.aspx
Specifically the 7 minutes video under "Add States to a Control".
Erwin van dar valk just published an excellent article demoing how to change VSM states from MVVM that's Pertinent to your situation.
http://blogs.msdn.com/erwinvandervalk/archive/2009/10/12/how-to-work-with-animations-in-silverlight-in-the-mvvm-pattern.aspx