我有一个包含各种项目的TreeView。Items被设置为使得IsSelected属性被绑定到我的VM到bool IsSelected。
每当我单击一个树视图项时,这个VM属性就会被调用两次,第一次调用的值为==false,然后调用的值是==true。
我认为这是一种正常的行为,但我不确定为什么,因为我以同样的方式绑定了IsExpended属性,并且只被调用一次。
谢谢
我有一个包含各种项目的TreeView。Items被设置为使得IsSelected属性被绑定到我的VM到bool IsSelected。
每当我单击一个树视图项时,这个VM属性就会被调用两次,第一次调用的值为==false,然后调用的值是==true。
我认为这是一种正常的行为,但我不确定为什么,因为我以同样的方式绑定了IsExpended属性,并且只被调用一次。
谢谢
我怀疑原因是当你选择一个项目时,首先取消选择旧项目,然后选择新项目。这导致第一次调用false,第二次调用true。
也许在调试时,检查视图模型上的DisplayName或类似属性,看看每次修改哪些项,看看情况是否确实如此。
同样,当您展开一个节点时,不需要折叠任何其他节点。因此,它只是扩展您尝试扩展的节点(对于IsExpanded为true)。
其原因是冒泡事件。
当一个事件被引发时,它将“冒泡”起来,直到它被处理为止。
您可以通过选择第三级项目来验证它。
您只需要设置<code>e.Handled=true</code>;
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