Entity Framework がコレクションの変更を追跡するには、型 '<var>Type Name</var>' のエンティティのナビゲーションプロパティ '<var>Property Name</var>' に IEnumerable が実装されている必要があります。

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The navigation property '<var>Property Name</var>' on entity of type '<var>Type Name</var>' must implement IEnumerable in order for Entity Framework to be able to track changes in collections.

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