定义：通过将绑定表达式用作定位器，“绑定”将实例数据结点连接到表单控制或模型项目约束。
Definition: a "binding" connects an instance data node to a form control or to a model item constraint by using a binding expression as a locater.
通过将绑定表达式用作定位器，“绑定”将实例数据结点连接到表单控制或模型项目约束。
A "binding" connects an instance data node to a form control or to a model item constraint by using a binding expression as a locater.
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