Biopython，导入错误与“导入生物”(Biopython, import error with “import Bio”)

 鉴于您将数据实现为树的方式，为什么不将'TreeViewItem.IsExpanded`依赖项属性绑定到您自己的节点上的bool属性？ 
 
 它至少需要是一个INotifyPropertyChanged属性，因此Node需要实现INotifyPropertyChanged 。 
 
 在Silverlight 5中，您可以设置这样的样式以绑定到IsExpanded属性： 
 
<Style TargetType="sdk:TreeViewItem" x:Key="itemStyle">
    <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
</Style>
 
 并使用 
 
ItemContainerStyle="{Binding Source={StaticResource itemStyle}}"
 
 在Silverlight 4中有许多变通方法。 

Given the way you are implementing your data as a tree, why not bind the 'TreeViewItem.IsExpanded` dependency property to a bool property on your own Node?
 
It will need to be an INotifyPropertyChanged property at a minimum so Node will need to implement INotifyPropertyChanged.
 
In Silverlight 5 you can just set a style like this to bind to the IsExpanded property:
 
<Style TargetType="sdk:TreeViewItem" x:Key="itemStyle">
    <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
</Style>
 
And use with
 
ItemContainerStyle="{Binding Source={StaticResource itemStyle}}"
 
In Silverlight 4 there are a number of workarounds.