Выражение "<var>X</var>" с входом, имеющим тип "<var>Type Name</var>", и проверкой с типом "X" не поддерживается. В запросах LINQ to Entities поддерживаются только типы сущности и сложные типы.

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The '<var>X</var>' expression with an input of type '<var>Type Name</var>' and a check of type 'X' is not supported. Only entity types and complex types are supported in LINQ to Entities queries.

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