Entity Framework 4.1 code first approach: how to define length of properties

Question

As the title implies:

how is it possible to tell Entity Framework 4.1 in code first approach, that i do want some properties (in particular of type string) to have a le

Answer 1

As is stated in my comment, it's simple.
Just use [StringLength(1000)] or [MaxLength] from DataAnnotation.

Answer 2

You can use the following way If you want a Maximum string length

[StringLength(Int32.MaxValue)]

Or

[MaxLength]

Or

Property(m => m.Title ).IsRequired().HasMaxLength(128);

Or

[MaxLength(256)]

Answer 3

In EF4.1 RTW default length is nvarchar(max) for SQL Server and nvarchar(4000) for SQL CE. To change the length use either StringLength or MaxLength annotations or fluent mapping HasMaxLength:

[StringLength(256)]
public string Title { get; set; }

Or

[MaxLength(256)]
public string Title { get; set; }

Or

modelBuilder.Entity<Book>()
            .Property(p => p.Title)
            .HasMaxLength(256);