实体框架的核心Migrationbuilder不是外键

实体框架的核心Migrationbuilder设置为空的属性外键实体框架的核心Migrationbuilder不是外键

migrationBuilder.CreateTable(
      name: "StudentProjects", 
      columns: table => new 
      { 
       StudentId = table.Column<int>(nullable: false), 
       **ProjectId** = table.Column<int>(nullable: false), // ??????? Why not setting nullable in migrationbuilder? 
       Active = table.Column<bool>(nullable: false), 
       Completed = table.Column<bool>(nullable: false), 
       EindDatum = table.Column<DateTime>(nullable: false), 
       Guid = table.Column<string>(nullable: false), 
       StartDatum = table.Column<DateTime>(nullable: false), 
       StudentProjectId = table.Column<int>(nullable: false) 
      }, 
      constraints: table => 
      { 
       table.PrimaryKey("PK_StudentProjects", x => new { x.StudentId, x.ProjectId }); 
       table.UniqueConstraint("AK_StudentProjects_StudentProjectId", x => x.StudentProjectId); 
       table.ForeignKey(
        name: "FK_StudentProjects_Projecten_ProjectId", 
        column: x => x.ProjectId, 
        principalTable: "Projecten", 
        principalColumn: "ProjectId", 
        onDelete: ReferentialAction.SetNull); 
       table.ForeignKey(
        name: "FK_StudentProjects_Studenten_StudentId", 
        column: x => x.StudentId, 
        principalTable: "Studenten", 
        principalColumn: "StudentId", 
        onDelete: ReferentialAction.SetNull); 
      }); 

[Table("StudentProjects")] 
public partial class StudentProject 
{ 

    public StudentProject() 
    { 

    } 

    [Key] 
    public int StudentProjectId { get; set; } 

    public DateTime StartDatum { get; set; } 

    public DateTime EindDatum { get; set; } 

    public bool Active { get; set; } 

    public int? ProjectId { get; set; } // ??????? Why not setting nullable in migrationbuilder?

等....

流利的代码不为空的设置属性..

modelBuilder.Entity<StudentProject>() 
      .HasKey(bs => new { bs.StudentId, bs.ProjectId }); 

     modelBuilder.Entity<StudentProject>() 
      .HasOne(bs => bs.Student) 
      .WithMany(b => b.StudentProjects) 
      .OnDelete(DeleteBehavior.SetNull) 
      .HasForeignKey(bs => bs.StudentId) 
      .IsRequired(); 

     modelBuilder.Entity<StudentProject>() 
      .HasOne(bs => bs.Project) 
      .WithMany(s => s.StudentProjects) 
      .OnDelete(DeleteBehavior.SetNull) 
      .HasForeignKey(bs => bs.ProjectId) 
      .IsRequired();

这是缺少流利的代码。我没有任何类中任何地方的组合主键。

项目类：公共部分类项目 {

public Project() 
    { 
     StudentProjects = new List<StudentProject>(); 
     ProjectSkills = new List<ProjectSkill>(); 
     ProjectVakken = new List<ProjectVak>(); 
    } 

    [Key] 
    public int ProjectId { get; set; } 

    [Required] 
    public string Naam { get; set; }

等等

来源

2017-08-01 Tryan18

请显示您使用的导航属性（两端）以及可能的数据注释和/或流畅的api配置。 – grek40

我刚刚添加了流利的代码。 – Tryan18

那么它已经被回答......'modelBuilder.Entity （）。HasKey（bs => new {bs.StudentId，bs.ProjectId}）;' - 不要问为什么你的主键的一部分是不可空。 – grek40

它是某种你按照定义不能包含空值主键的一部分。我有一种感觉，你没有在这里显示完整的信息。

来源

2017-08-01 14:28:18

对不起我的坏。我发现我在流利的代码中创建了一个多对多的关系，实际上它应该是流畅的一对多关系。

来源

2017-08-01 15:15:15 Tryan18

实体框架的核心Migrationbuilder不是外键

回答

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