不过匿名类的名称却无法预料，因此我们只需要考虑其实现细节。
However, the names are not necessarily predictable and should be considered an implementation detail.
将不同属性指定为键属性的匿名类型实例不是同一类型的实例。
GetHashCode for an anonymous type is based on the key properties of the type.
将不同属性指定为键属性的匿名类型实例不是同一类型的实例。
GetHashCode for an anonymous type is based on the key properties of the type.
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