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Currently I have class hierarchy defined with the Code First approach as follows.
E.F. has autogenerated a nvarchar(128) discriminator. It is not a key field.
How does Entity Framework determine what and what Type the discriminator field should be, and is it always the same, i.e. nvarchar? Is the discriminator at all accessible outside the database i.e. from LINQ to Entity?
Discriminator column is by default nvarchar because it stores names of your classes to differ between types – that is the whole point of this column: to allow EF knowing what class instance from your inheritance hierarchy it should create when it loads record from the database.
Discriminator column is not accessible by linq-to-entities. It is only used to map record to correct type.