/// <summary>
/// 附加对象到上下文;如果已经有此实体对象，则不会进行 Attach 操作;
/// </summary>
public void SafeAttach(Type entityType, IId entity)
{
if (!this.ChangeTracker.Entries().Any(a => DbContextUtil.GetEntityType(a.Entity.GetType()) == entityType && ((IId)a.Entity).Id == entity.Id))
{
#if NETCOREAPP2_2
this.Attach(entity);
#else
this.Set(entityType).Attach(entity);
#endif
// this.Set(entityType).Attach(entity); //
}
}
/// <summary>
/// 维护实体 UpperIds 字段;
/// </summary>
/// <param name="context"></param>
/// <param name="entityType"></param>
/// <param name="state"></param>
/// <param name="entity"></param>
public static void MaintainUpperids(DbContext context, Type entityType, EntityState state, object entity)
{
entityType = DbContextUtil.GetEntityType(entityType);
if (!typeof(IdEntity).IsAssignableFrom(entityType) || !typeof(IRelateToUpper).IsAssignableFrom(entityType))
{
throw new Exception(entityType.Name + " 未实现 IId 和 IRelateToUpper 接口,不可以调用此方法");
}
MethodInfo methodInfo = null;
if (!typeGenericMethodMap.TryGetValue(entityType, out methodInfo))
{
methodInfo = GenericMaintainUpperidsWhenCreate = typeof(IRelateToUpperUtil)
.GetMethods(BindingFlags.Static | BindingFlags.Public)
.First(a => a.Name == "MaintainUpperids" && a.IsGenericMethod)
.MakeGenericMethod(new Type[] { entityType });
typeGenericMethodMap[entityType] = methodInfo;
}
// GenericMaintainUpperidsWhenCreate.Invoke(null, new object[] { context, state, entity }); 每个类型都会定义不同的泛型方法中;
methodInfo.Invoke(null, new object[] { context, state, entity });
}