Entity Framework 7 Beta7 has no ColumnType anymore

问题

This code does not compile as the ColumnType method is unknown in EF7 Beta7.

What is the new method to determine a special column type?

 modelBuilder.Entity<Language>()
                .Property(a => a.ISO639_ISO3166)
                .ColumnType("char")
                .MaxLength(5)
                .Required();

回答1:

To change the column type you need to use the HasColumnType method:

modelBuilder.Entity<Language>()
            .Property(a => a.ISO639_ISO3166)
            .HasColumnType("char")
            .MaxLength(5)
            .Required();

And if you are targeting more than one relational provider with the same model then you probably want to specify a data type for each provider rather than a global one to be used for all relational providers:

modelBuilder.Entity<Language>()
            .Property(a => a.ISO639_ISO3166)
            .HasSqlServerColumnType("char")
            .MaxLength(5)
            .Required();

来源：https://stackoverflow.com/questions/32655634/entity-framework-7-beta7-has-no-columntype-anymore