36 lines
698 B
C#
36 lines
698 B
C#
using System;
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/*
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* Оператор условного null
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*/
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class Program
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{
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private static Person GetPerson()
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{
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Person person = null;
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return person;
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}
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static void Main()
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{
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Person person = null;
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Console.WriteLine(person?.Contacts?.PhoneNumber ?? "no data");
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person = GetPerson();
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// person, Contacts и PhoneNumber - ссылочные типы - так как они class
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Console.WriteLine(person?.Contacts?.PhoneNumber ?? "no data");
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Console.ReadKey();
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}
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}
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public class Person
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{
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public Contacts Contacts { get; set; }
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}
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public class Contacts
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{
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public string PhoneNumber { get; set; }
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} |