Fluent nhibernate map IDictionary<int, string>?

Question

After searching around the web I found a mapping that gets most of the job done:

In my class I have:

public virtual IDictionary<int, string> _properties { get; set; } 

And in the mapping:

HasMany(x => x._properties)
     .AsMap<string>(index => index.Column("PropertyID").Type<int>(),
                    element => element.Column("Value").Type<string>())
                   .KeyColumn("ID")
                   .ForeignKeyConstraintName("FK_DeftoProperties")
                   .Table("Definition_Property")
                   .Not.LazyLoad()
                   .Access.Property()
                .Cascade.All();

Which results in this table definition:

create table Definition_Property (
        ID UNIQUEIDENTIFIER not null,
       Value NVARCHAR(255) null,
       PropertyID INT not null,
       primary key (ID, PropertyID)
    )

However I need the "Value" to be longer that 255 and changing the mapping to:

element => element.Column("Value").Type<string>().Length(500)

doesn't have any affect on the table generation.

If I map it using an hbm file:

I get the table I expected.

Any ideas on how to set the length fluently?

Answer 1

...Element("Value", x => x.Length(300))...