相关疑难解决方法(0)

假设,我有这个界面,

interface IContact
{
    IAddress address { get; set; }
}

interface IAddress
{
    string city { get; set; }
}

class Person : IPerson
{
    public IContact contact { get; set; }
}

class test
{
    private test()
    {
        var person = new Person();
        if (person.contact.address.city != null)
        {
            //this will never work if contact is itself null?
        }
    }
}

Person.Contact.Address.City != null (这可以检查City是否为空.)

但是,如果Address或Contact或Person本身为null,则此检查将失败.

目前,我能想到的一个解决方案是:

if (Person != null && Person.Contact!=null && Person.Contact.Address!= null && Person.Contact.Address.City != …