我有這些模型public class WarehouseAllocation{   public int Id { get; set; }   public Warehouse Warehouse { get; set; }   public IList<Dispatch> Dispatches { get; set; }   //---- removed other properties for brevity}public class Dispatch {   public int Id { get; set; }   public IList<DispatchDetail> DispatchDetails { get; set; }   //---- removed other properties for brevity}在數(shù)據(jù)庫(kù)上，Dispatch 有一個(gè)引用 WarehouseAllocation 表的外鍵 WarehouseAllocationId。我使用 Fluent API 將模型映射到數(shù)據(jù)庫(kù)，如下所示：modelBuilder.Entity<WarehouseAllocation>(m =>{    m.ToTable("WarehouseAllocation");    m.Property(wa => wa.Id).HasColumnName("WarehouseAllocationId")         .ValueGeneratedOnAdd();    m.HasKey(wa => wa.Id);    m.HasOne(wa => wa.Warehouse)        .WithMany()        .HasForeignKey("WarehouseId");    m.HasMany(w => w.Dispatches)        .WithOne();});modelBuilder.Entity<Dispatch>(m =>{    m.ToTable("Dispatch");    m.Property(wa => wa.Id).HasColumnName("DispatchId")         .ValueGeneratedOnAdd();    m.HasKey(wa => wa.Id);});當(dāng)我調(diào)用 時(shí) dbContext.WarehouseAllocations             .Include(w => w.Dispatches)             .ThenInclude(w => w.DispatchDetails).ToList()，Ef 核心檢索所有倉(cāng)庫(kù)分配及其調(diào)度，包括詳細(xì)信息。問(wèn)題是當(dāng)我使用這種方法時(shí)：var warehouseAllocation = dbContext.WarehouseAllocations    .Include(w => w.Dispatches)    .ThenInclude(d => d.DispatchDetails)    .SingleOrDefault(w => w.Id == warehouseAllocationId);warehouseAllocation.Dispatches.Add(new Dispatch{   //--including other properties   DispatchDetails = new List<DispatchDetail> {       new DispatchDetail       {          //--other properties       }   }});// call another query that includes WarehouseAllocationdbContext.ChangeTracker.HasChanges() // this is falsedbContext.SaveChanges() // this keeps returning zero為什么沒(méi)有檢測(cè)到變化？