How not persist property EF4 code first?
How do I make non persisted properties using codefirst EF4?
MS says there is a StoreIgnore Attribute, but I cannot find it.
http://blogs.msdn.com/b/efdesign/archive/2010/03/30/data-annotations-in-the-entity-framework-and-code-first.aspx
Is there a way to set this up using EntityConfiguration?
在EF Code-First CTP5中,您可以使用[NotMapped]
注释。
using System.ComponentModel.DataAnnotations;
public class Song
{
public int Id { get; set; }
public string Title { get; set; }
[NotMapped]
public int Track { get; set; }
Currently, I know of two ways to do it.
Add the 'dynamic' keyword to the property, which stops the mapper persisting it:
private Gender gender;
public dynamic Gender
{
get { return gender; }
set { gender = value; }
}
Override OnModelCreating in DBContext and remap the whole type, omitting the properties you don't want to persist:
protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<Person>().MapSingleType(p => new { p.FirstName, ... });
}
Using method 2, if the EF team introduce Ignore, you will be able to easily change the code to:
modelBuilder.Entity<Person>().Property(p => p.IgnoreThis).Ignore();
I'm not sure if this is available yet.
On this MSDN page the Ignore Attribute and API are described but below, in the comments, somebody writes on 4 june 2010:
You will be able to ignore properties in the next Code First release,
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