This will create the following SQL script: CREATE UNIQUE NONCLUSTERED INDEX ON.
Property(x => x.Name).IsRequired().HasMaxLength(450).HasColumnAnnotation("Index", new IndexAnnotation(new RequiredAttribute: Specifies that a data field value is required. RegularExpressionAttribute: Specifies that a data field value in ASP.NET Dynamic Data must match the specified regular expression. RangeAttribute: Specifies the numeric range constraints for the value of a data field. If you use Fluent: public class UserMap : EntityTypeConfiguration Specifies that a data field value is a well-formed phone number. Your model will look like this now in EF CF 6.1+: public class User You can solve this by setting a maximum string length on your model:
#Data annotations entity framework code#
The classes defined within the source code become the model. SQL Server retains the 900-byte limit for the maximum total size of all index key columns." Code First Using the Entity Framework Code First modeling path, developers define the application domain model using source code rather than working directly with a designer or an XML-based configuration file. If your model field is a string, make sure it is not set to nvarchar(MAX) in SQL Server or you will see this error with Entity Framework Code First:Ĭolumn 'x' in table 'dbo.y' is of a type that is invalid for use as a key column in an index. Large Community and integrations with many different frameworks (Symfony, Laravel, Laminas and more). You can find it in this namespace: using
In Entity Framework 6.1+ you can use this attribute on your model: Data Annotations Column Attribute We use the Table Attribute or Table Name Attribute to specify the table name and schema to the Entity Framework.
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