rspec/rules/S3247/csharp/rule.adoc

Because the ``++is++`` operator performs a cast if the object is not null, using ``++is++`` to check type and then casting the same argument to that type, necessarily performs two casts. The same result can be achieved more efficiently with a single cast using ``++as++``, followed by a null-check.


== Noncompliant Code Example

----
if (x is Fruit)  // Noncompliant
{
  var f = (Fruit)x; // or x as Fruit
  // ...
}
----


== Compliant Solution

----
// C# 6
var f = x as Fruit;
if (f != null)
{
  // ...
}
// C# 7
if (x is Fruit fruit)
{
  // ...
}
----


ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::message.adoc[]

include::highlighting.adoc[]

'''
== Comments And Links
(visible only on this page)

include::comments-and-links.adoc[]
endif::env-github,rspecator-view[]