比较id字段上的两个相同类型的对象，以便我知道更新或保存对象

Question

我有两个类型为CustomerEntity的对象列表。他们属于同一个实体。

CustomerEntity包含2个字段。

CustomerEntity
ID
Name
List<Customerntity> incomingCustomer
List<CustomerEntity> dbCustomers

我在比较Id上的2个对象列表时遇到问题。如果incomingCustomer Id存在于dbCustomers中，则将该对象添加到List<CustomerEntity> customersToUpdate中。

我尝试过linq和for每个语句，但都无法想出一个优雅的解决方案。

尝试：

var tmp = incomingCustomer.Where(x =>
dbCustomers.Any(z => x.Id == z.Id)
&& !dbCustomers.Any(z => x.Id == z.Id));

同样疲惫的前臂环，这是一场灾难

感谢的帮助

Answer 1

获取样本

// These are the class structure
class dbCustomer : CustomerEntity
{
}

class incomingCustomer : CustomerEntity
{

}
class CustomerEntity
{
public int Id { get; set; }
}
// Sample data in list
IList<dbCustomer> dbCustomers = new List<dbCustomer>
{
new dbCustomer{ Id = 2},
new dbCustomer{ Id = 3},
new dbCustomer{ Id = 4}
};
IList<incomingCustomer> incomingCustomer = new List<incomingCustomer>
{
new incomingCustomer{ Id = 1},
new incomingCustomer{ Id = 2},
new incomingCustomer{ Id = 4}
};
// your query
List<CustomerEntity> customersToUpdate = dbCustomers.Where(l1 => incomingCustomer.Any(l2 => l2.Id == l1.Id)).ToList<CustomerEntity>();