我有一个关于在WPF MVVM视图中执行自定义绘制操作的问题。我的案例是：
对模型数据进行外部操作，并修改要显示的可观察数据集合（存储一些要在图中显示的数据）。我必须对视图中的更改做出反应，并自定义图表元素的布局（删除未使用的元素，放置新元素，计算图表画布上的位置）。我该如何做到这一点，以及遵循MVVM模式的最佳方法是什么？我不能将关系图类划分为子类，因为它是密封的。使用的诊断框架是MindFusion。
Edit: A solution was proposed on MindFusion Support forum, and it works. http://mindfusion.eu/Forum/YaBB.pl?board=wpfdg_disc;action=display;num=1306412889;start=0
上次我检查了WPF的MindFusion诊断组件，它通过数据绑定支持MVVM。如果将图表绑定到ObservableCollection，则可以编写自定义节点模板，这些模板基本上是DataTemplate，将在图表面板上呈现YourDiagramModel项。
与WinForms不同，您通常不需要手动刷新或绘制WPF自定义控件中的控件表面。
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