C#代码(EF6代码优先):
public class ProjectSourceProject { [Key,Column(Order = 0)] //[Key,Column(Order = 0),ForeignKey("ProjectSource")] //[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int ProjectSource_id { get; set; } // { get; set; } was missing :) [Key,Column(Order = 1)] //[Key,Column(Order = 1),ForeignKey("Project")] //[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int Project_id { get; set; } // { get; set; } was missing :) //public virtual ICollection<Project> projects { get; set; } //public virtual ICollection<ProjectSource> projectSources { get; set; } public ProjectSourceProject() { //projects = new HashSet<Project>(); //projectSources = new HashSet<ProjectSource>(); } }
数据库:
One or more validation errors were detected during model generation: EntityType 'ProjectSourceProject' has no key defined. Define the key for this EntityType.
C#代码2:
public class ProjectSourceProject { //[Key] //[Key,Column(Order = 0)] public int ProjectSource_id { get; set; } // { get; set; } was missing :) //[Key] //[Key,Column(Order = 1)] public int Project_id { get; set; } // { get; set; } was missing :) public ProjectSourceProject() { } }
和
protected override void OnModelCreating(DbModelBuilder modelBuilder) { base.OnModelCreating(modelBuilder); modelBuilder.Entity<ProjectSourceProject>() .HasKey(psp => new { psp.ProjectSource_id,psp.Project_id }); //base.OnModelCreating(modelBuilder); }
得到以下奇怪的错误:
The properties expression 'psp => new <>f__AnonymousType0`2(ProjectSource_id = psp.ProjectSource_id,Project_id = psp.Project_id)' is not valid. The expression should represent a property: C#: 't => t.MyProperty' VB.Net: 'Function(t) t.MyProperty'. When specifying multiple properties use an anonymous type: C#: 't => new { t.MyProperty1,t.MyProperty2 }' VB.Net: 'Function(t) New With { t.MyProperty1,t.MyProperty2 }'.
编辑:问题修复,谢谢莫霍:)
这适用于这两种情况.
解决方法
制作PK字段属性……
[Key,ForeignKey("ProjectSource_projects_Source")] public int ProjectSource_id { get; set;} // add { get; set; } [Key,ForeignKey("ProjectSource_projects_Target")] public int Project_id { get; set;} // add { get; set; }
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。