Returns a value indicating whether the given object has been serialized, optionally considering preset expressions.
返回一个值，指示给定对象是否已序列化，也可以考虑预设表达式。
If the object contains dependency properties with expressions (such as a data binding), the current value of the expression is copied but not the expression itself.
如果物件包含具有运算式(例如资料系结)的相依性属性，则会复制运算式的目前值，而不是运算式本身。
If the object contains dependency properties with expressions (such as a data binding), the current value of the expression is copied but not the expression itself.
如果物件包含具有运算式(例如资料系结)的相依性属性，则会复制运算式的目前值，而不是运算式本身。
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