我正在使用实体框架,并且使用联结表有很多对很多的关系。
据我了解应该生成它,因此我的上下文如下所示:
public DbSet<Candidate> Candidates { get; set; }
public DbSet<SkillSet> SkillSets { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Candidate>().HasMany(t => t.SkillSets).WithMany(t => t.Candidates)
.Map(m =>
{
m.ToTable("candidate_skillset");
m.MapLeftKey("candidate_id");
m.MapRightKey("skillset_id");
});
modelBuilder.Entity<SkillSet>().ToTable("skillset");
modelBuilder.Entity<Candidate>().ToTable("candidate");
}
候选模型:
namespace CandidateCatalog.Model
{
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
[Table("candidate")]
public class Candidate
{
#region Simple propertied
[Key]
public int id { get; set; }
[Column("firstname")]
public string Firstname { get; set; }
#endregion
#region reference properties
public int? commendation_id { get; set; }
[ForeignKey("commendation_id")]
public Commendation commendation { get; set; }
public ICollection<SkillSet> SkillSets { get; set; }
#endregion
}
}
技能集模型:
namespace CandidateCatalog.Model
{
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
[Table("skillset")]
public class SkillSet : SimpleDictionary
{
public virtual ICollection<Candidate> Candidates { get; set; }
}
}
实体框架生成了一些默认的联结表名称,因此我想需要定义该名称。这是问题所在,该如何解决?
编辑:
我添加了流利的api;
它可以看到属性:
public ICollection<SkillSet> SkillSets { get; set; }
但是当我尝试例如:
var ca = this._catalog.Candidates.FirstOrDefault(x => x.id == 125).SkillSets;
我得到0,好像从未填充过集合,我已经仔细检查了数据库关系。
最佳答案
您需要使用Fluent API,例如:
楷模:
public class Candidate
{
[Key]
public int CandidateId { get; set; }
Column("firstname")]
public string Firstname { get; set; }
public virtual ICollection<SkillSet> SkillSets { get; set; }
}
public class SkillSet : SimpleDictionary
{
[Key]
public int SkillSetId { get; set; }
public virtual ICollection<Candidate> Candidates { get; set; }
}
流利的API
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<SkillSet>()
.HasMany<Candidate>(s => s.Candidates)
.WithMany(c => c.SkillSets)
.Map(cs =>
{
cs.MapLeftKey("SkillSetId");
cs.MapRightKey("CandidateId");
cs.ToTable("candidate_skillset");
});
modelBuilder.Entity<SkillSet>().ToTable("skillset");
modelBuilder.Entity<Candidate>().ToTable("candidate");
}
关于c# - 在 Entity Framework 6中更改默认联结表名,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/41743139/