![]() ![]() By default, EF validates all data before it is written to the database, using a wide range of data validation methods. Whatever the cause, we need to prevent bad data reaching the database.Įntity Framework’s (EF) data validation is part of the solution for catching bad data in an application. There are other ways that bad data will arrive: it could mean an attack by hackers, for example. For them, we need to provide meaningful error messages to help them quickly correct their input otherwise they will get annoyed or, on ecommerce sites, they may give up and not buy anything. Let me know your thoughts.Most of the time, bad data gets to a system because our users get things wrong with data entry. Not MappedĪ NotMapped attribute can be placed on a property in an EF core model, indicating that the property does not correspond to any database column and should not create any column in the database. It is just applies minimum length validation rule for the property. Note that minimum length does not affect schema definition. Alternatively, MaxLength attribute can be used to specify maximum length. StringLengthAttribute allows setting min length and/or max length for the column. There are two different attributes which allow setting appropriate length on the property. String Lengthīy default, string property translates to nvarchar(max) provided the column is not key for the EF core model. On the other hand, if the key has any other data type (non numeric or non GUID), then DatabaseGenerated attribute can be placed to auto-generate the primary key. There is no need for additional configurations. With EF Core, any non-composite integer ( for example, int and long) property or a GUID property are by default marked to be auto-generated. In real world applications, primary keys are generally set to autogenerate values. Otherwise, Key attribute can be placed on a property to indicate that it should be a primary key for the model. Primary Keyīy convention, if any property has name Id or Id, then it is by default considered as primary key for that EF Core model. NET reference type can be made required (when NRT is not enabled) – by placing Required attribute on the property. For example, string? would be optional property while string would be a required property.īelow code example shows how a.
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