C＃原始对象和会话信息被覆盖

Question

我第一次看到这个。这就是我所拥有的

我从会话中获得了客户，这里我的国家代码是2个字母的代码

var selCustomer = SessionService.GetItem<Customer>(SessionKeys.SelectedCustomer);

我需要将2个字母的国家/地区代码转换为3个字母的国家/地区代码以供特定用途

var customerAddress = GeographyServiceInstance.FixAddresss(selCustomer.CustomerAddress, true);

在此阶段，当我检查信息时，selCustomer.CustomerAddress，customerAddress甚至会话中的客户都更改为3个字母代码。我不是在这里设置会话，那为什么它被覆盖了呢？

我能够在session和selCustomer.CustomerAddress没有被覆盖的地方进行的唯一方法是

var customer = 
    SessionService.GetItem<Customer>(SessionKeys.SelectedCustomer);

// turn customer address into 3 letter country code, 
// hard way, otherwise original object and session 
// address are being overwritten
Address customerAddress = null;
if (customer.CustomerAddress != null)
{
    customerAddress = new Address
    {
        AddressId = customer.CustomerAddress.AddressId,
        AddressLine1 = customer.CustomerAddress.AddressLine1,
        AddressLine2 = customer.CustomerAddress.AddressLine2,
        City = customer.CustomerAddress.City,
        CountryCode = customer.CustomerAddress.CountryCode,
        CountryInfo = customer.CustomerAddress.CountryInfo,
        StateCode = customer.CustomerAddress.StateCode,
        StateInfo = customer.CustomerAddress.StateInfo
    };
}
customerAddress =
    GeographyServiceInstance.FixAddress(customerAddress, true);