【EF Code First】 多对多关系配置

/// <summary>
    /// 用户
    /// </summary>
   public class User
    {       
       public int ID { get;set;}

       public string NickName { get; set; }       
       
       public DateTime RegisterTime { get; set; }

       /// <summary>
       /// 参与的项目列表
       /// </summary>
       public ICollection<Project> Projects { get; set; }
    }

/// <summary>
    /// 项目
    /// </summary>
   public   class Project
    {      
       public int ID { get; set; }

       public string Title { get; set; }

       public string Description { get; set; }

       /// <summary>
       /// 项目发布者
       /// </summary>
       public virtual User Founder { get; set; }

       /// <summary>
       /// 参与成员
       /// </summary>
       public virtual ICollection<User> Member { get; set; }

    }

 public class UserMap : EntityTypeConfiguration<User>
    {
        public UserMap() { //定义用户与项目之间的多对多关系
            this.HasMany<Project>(u => u.Projects).WithMany(p=>p.Member);
        }
    }

public  class DB:DbContext
    {
       public DB() : base("DefaultConnection") { }

       public DbSet<User> User { get; set; }
       public DbSet<Project> Project { get; set; }

       protected override void OnModelCreating(DbModelBuilder modelBuilder)
       {
           modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();//移除复数表名的契约

          // base.OnModelCreating(modelBuilder);
           modelBuilder.Configurations.Add(new UserMap());
       }
    }

 class Program
    {
        static void Main(string[] args)
        {
            DB db = new DB();            
            db.User.ToList();
            Console.ReadKey();
        }
    }