抽象类别不能执行个体化。
经过执行个体化的委派可当做被包装的方法本身叫用。
An instantiated delegate can be invoked as if it were the wrapped method itself.
资料来源物件为每个提供者都必须执行个体化的初始物件。
The data source object is the initial object that every provider must instantiate.
资料来源物件为每个提供者都必须执行个体化的初始物件。
The data source object is the initial object that every provider must instantiate.
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