一对多关系的Fluent API配置

Question

当配置一对多关系时，我通常"仅"；从一个方面配置关系。但我想知道双方配置关系会有什么效果？这是丰富的、模棱两可的还是有任何意义的全面影响？

public class Student
{
public int Id { get; set; }
public string Name { get; set; }
public int CurrentGradeId { get; set; }
public Grade Grade { get; set; }
}
public class Grade
{
public int GradeId { get; set; }
public string GradeName { get; set; }
public string Section { get; set; }
public ICollection<Student> Students { get; set; }
}

Fluent API配置

public class StudentConfiguration : IEntityTypeConfiguration<Student>
{
public void Configure(EntityTypeBuilder<Student> builder)
{
builder
.ToTable("Students")
.HasKey(p => p.Id);
builder
.HasOne(student  => student.Grade)
.WithMany(grade => grade.Students)
.HasForeignKey(student => student.CurrentGradeId)
}
}
public class GradeConfiguration : IEntityTypeConfiguration<Grade>
{
public void Configure(EntityTypeBuilder<Grade> builder)
{
builder
.ToTable("Grades")
.HasKey(p => p.GradeId);
builder
.HasMany(grade => grade.Students)
.WithOne(student => student.Grade)
.HasForeignKey(student => student.CurrentGradeId)
}
}

Answer 1

您可以执行任一操作。但不是两者都有。(尽管您似乎已经交换了"Has…"代码块(。

https://www.learnentityframeworkcore.com/configuration/one-to-many-relationship-configuration