警告

This documentation is for EF7 onwards. For EF6.x and earlier release see http://msdn.com/data/ef. 本文档是基于EF7版本.对于EF6.x及更早的版本请参见 http://msdn.com/data/ef.

注解

This article uses EF 7.0.0-rc1 which is the latest pre-release available on NuGet.org. You can find nightly builds of the EF7 code base hosted on https://www.myget.org/F/aspnetvnext/ but we do not maintain up-to-date documentation for nightly builds.

Including & Excluding Properties

Including a property in the model means that EF has metadata about that property and will attempt to read and write values from/to the database.

In this article:

Conventions

By convention, every property on each entity type will be included in the model. This includes private properties and those without a getter or setter.

Data Annotations

You can use Data Annotations to exclude a property from the model.

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    public class Blog
    {
        public int BlogId { get; set; }
        public string Url { get; set; }

        [NotMapped]
        public DateTime LoadedFromDatabase { get; set; }
    }

Fluent API

You can use the Fluent API to exclude a property from the model.

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    class MyContext : DbContext
    {
        public DbSet<Blog> Blogs { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Blog>()
                .Ignore(b => b.LoadedFromDatabase);
        }
    }

    public class Blog
    {
        public int BlogId { get; set; }
        public string Url { get; set; }

        public DateTime LoadedFromDatabase { get; set; }
    }