A generic type definition is not assignable from a closed constructed type.
泛型类型定义不可以从封闭构造的类型赋值。
If a nested type is generic, this method returns its generic type definition.
如果嵌套类型为泛型，则此方法返回其泛型类型定义。
Returns the field of the specified constructed generic type that corresponds to the specified field of the generic type definition.
传回指定之建构泛型型别的栏位，其对应于泛型型别定义的指定栏位。
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