如何处理Entity Framework中的"辅助"键

modelBuilder.Entity<YourEntity>()
    .HasKey(e => new { e.Property1, e.Property2 });

modelBuilder.Entity<YourEntity>()
    .HasOne(e => e.RelatedEntity)
    .WithMany(e => e.RelatedEntities)
    .HasForeignKey(e => e.ForeignKeyProperty);

var query = context.YourEntities
    .Where(e => e.Property1 == value1 && e.Property2 == value2);

var entity = context.YourEntities.Find(keyValue);
entity.Property1 = newValue1;
entity.Property2 = newValue2;
context.SaveChanges();

var entity = context.YourEntities.Find(keyValue);
context.YourEntities.Remove(entity);
context.SaveChanges();