角色绑定指示出服务提供者的哪一个部分在服务契约中扮演哪一个角色。
The role bindings indicate which part of the service provider plays which role in the service contract.
实际上，绑定标识出一个或一组节点，然后对这些节点施加特定的限制，进而帮助定义节点的行为。
Rather, a binding identifies a node or a set of nodes, then places specific restrictions on those nodes, which in turn help to define the node's behavior.
当绑定数据源支持更新时，GridView 能够自动执行数据操作，从而提供真正的出盒解决方案。
When the bound data source supports updates, the GridView can automatically perform data operations, thus providing a real solution right out of the box.
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