Tutorial by Examples



The ?. operator is syntactic sugar to avoid verbose null checks. It's also known as the Safe navigation operator. Class used in the following example: public class Person { public int Age { get; set; } public string Name { get; set; } public Person Spouse { get; set; } } If a...
Similarly to the ?. operator, the null-conditional index operator checks for null values when indexing into a collection that may be null. string item = collection?[index]; is syntactic sugar for string item = null; if(collection != null) { item = collection[index]; }
var person = new Person { Address = null; }; var city = person.Address.City; //throws a NullReferenceException var nullableCity = person.Address?.City; //returns the value of null This effect can be chained together: var person = new Person { Address = new Address { ...
Extension Method can work on null references, but you can use ?. to null-check anyway. public class Person { public string Name {get; set;} } public static class PersonExtensions { public static int GetNameLength(this Person person) { return person == null ? -1 : pers...

Page 1 of 1