如何在EF Core中使用组合键创建依赖图

public class MainEntity
{
    public int Key1 { get; set; }
    public int Key2 { get; set; }
    public string Name { get; set; }
    //其他属性

    public ICollection<DependentEntity> DependentEntities { get; set; }
}

public class DependentEntity
{
    public int Key1 { get; set; }
    public int Key2 { get; set; }
    public string Description { get; set; }
    //其他属性

    public MainEntity MainEntity { get; set; }
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<MainEntity>()
        .HasKey(e => new { e.Key1, e.Key2 });

    modelBuilder.Entity<DependentEntity>()
        .HasKey(e => new { e.Key1, e.Key2 });

    modelBuilder.Entity<DependentEntity>()
        .HasOne(e => e.MainEntity)
        .WithMany(e => e.DependentEntities)
        .HasForeignKey(e => new { e.Key1, e.Key2 });
}

//查询具有特定组合键的主实体
var mainEntity = dbContext.MainEntities
    .FirstOrDefault(e => e.Key1 == 1 && e.Key2 == 2);

//查询特定主实体的从属实体
var dependentEntities = dbContext.DependentEntities
    .Where(e => e.Key1 == mainEntity.Key1 && e.Key2 == mainEntity.Key2)
    .ToList();

//创建新的主实体和从属实体
var newMainEntity = new MainEntity { Key1 = 3, Key2 = 4, Name = "New Main Entity" };
var newDependentEntity = new DependentEntity { Key1 = 3, Key2 = 4, Description = "New Dependent Entity" };

dbContext.MainEntities.Add(newMainEntity);
dbContext.DependentEntities.Add(newDependentEntity);
dbContext.SaveChanges();