What are valid primitive properties in Entity Framework Code First?

When I try to map a column to a char data type in my model class I get an error:

The property '[ColumnName]' is not a declared property on type '[ClassName]'. Verify that the property has not been explicitly excluded from the model by using the Ignore method or NotMappedAttribute data annotation. Make sure th开发者_开发知识库at it is a valid primitive property.

What are the valid primitive types for EF Code First?

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This is interesting but you really cannot map char property. I just checked it and if you want to have char(1) in the database you must use string property with following mapping:

modelBuilder.Entity<MyEntity>()
            .Property(p => p.MyProperty)
            .HasMaxLength(1)
            .IsFixedLength()
            .IsUnicode(false);

It is not only problem of Code-first. It is whole EF limitation because EDMX designer also doesn't show char type. I think allowed types will be same as described in CSDL reference for EDMX because code first is just wrapper around the same mapping infrastructure.