c# – 获取最近创建的实体的ID – ADO实体框架

发布时间：2020-12-15 06:54:03 所属栏目：百科来源：网络整理

导读：假设您使用ADO实体框架创建一个对象并保存到数据库,如下面的代码所示. private void CreateAddress(BizObjects.Address address){ var entity = new EntityFramework.Address(); entity.Line1 = address.Line1; entity.Line2 = address.Line2; entity.City =

假设您使用ADO实体框架创建一个对象并保存到数据库,如下面的代码所示.

private void CreateAddress(BizObjects.Address address)
{
    var entity = new EntityFramework.Address();

    entity.Line1 = address.Line1;
    entity.Line2 = address.Line2;
    entity.City = address.City;
    entity.State = address.State;
    entity.ZipCode = address.ZipCode;

    _entities.AddToAddress(entity);
    _entities.SaveChanges();
}

如何检索新创建的对象的ID？

提前致谢.

解决方法

一旦调用“SaveChanges()”,实体对象应该具有由框架填充的ID字段.

private void CreateAddress(BizObjects.Address address)
{
    var entity = new EntityFramework.Address();

    entity.Line1 = address.Line1;
    entity.Line2 = address.Line2;
    entity.City = address.City;
    entity.State = address.State;
    entity.ZipCode = address.ZipCode;

    _entities.AddToAddress(entity);
    _entities.SaveChanges();

    address.Id = entity.Id; // At this point the entity object will have the value of the Id field.
}

希望这可以帮助…

（编辑：李大同）

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