Message in Chinese (Simplified) (中文(简体))
当 ItemCollection 没有内部集合时操作无效。ItemCollection 未初始化或者 ItemsControl.ItemSource 上的绑定为集合提供了空值。
Unlocalized message
Operation is not valid while ItemCollection has no inner collection. ItemCollection is uninitialized or binding on ItemsControl.ItemSource supplied null for collection.
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