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Entity Framework NotMapped Data Annotation
The NotMapped
attribute is used to specify that an entity or property is not to be mapped to a table or column in the database.
- In EF, the default Code First conventions create a column for every property that is of a supported data type and which includes getters and setters.
- The
NotMapped
attribute overrides this default convention, and the entity or property will not be mapped to a table or column in the database.
The following example will not be map the AuditLog
class to a table in the database.
public class Book { public int BookId { get; set; } public string Title { get; set; } } [NotMapped] public class AuditLog { public int EntityId { get; set; } public int UserId { get; set; } public DateTime Modified { get; set; } }
In this example, the FullName
property will not be mapped to a column in the 'Authors' table in the database:
public class Author { public int AuthorId { get; set; } public string FirstName { get; set; } public string LastName { get; set; } [NotMapped] public string FullName { get { return FirstName + " " + LastName; } } }
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