The as operator attempts to convert an expression to a specified type, returning the value of null if the conversion fails. It behaves similarly to doing the conversion using a cast, but does not throw an exception if the cast fails.
// (Terrier is a sub-class of Dog)
Dog d = new Dog("Fido", 5);
Terrier t = new Terrier("Jack", 17, "Crabby");
Dog d2 = t;
Dog dTest = d as Dog; // ok
dTest = d as Terrier; // null
dTest = t as Dog; // ok
Terrier tTest = t as Terrier; // ok
dTest = d2 as Dog; // ok
tTest = d2 as Terrier; // ok
Object oTest = d as object; // ok
Filed under: Operators Tagged: as, as operator, C#, Operators
