include::description.adoc[]

== Noncompliant Code Example

[source,csharp]
----
public Result[] GetResults()
{
    return null; // Noncompliant
}

public IEnumerable<Result> GetResults(bool condition)
{
    var results = GenerateResults();
    return condition 
        ? results 
        : null; // Noncompliant
}

public IEnumerable<Result> GetResults() => null; // Noncompliant

public IEnumerable<Result> Results 
{
    get
    {
        return default(IEnumerable<Result>); // Noncompliant
    }
}

public IEnumerable<Result> Results => default; // Noncompliant
----

== Compliant Solution

[source,csharp]
----
public Result[] GetResults()
{
    return new Result[0];
}

public IEnumerable<Result> GetResults(bool condition)
{
    var results = GenerateResults();
    return condition 
        ? results 
        : Enumerable.Empty<Result>(); 
}

public IEnumerable<Result> GetResults() => Enumerable.Empty<Result>();

public IEnumerable<Result> Results 
{
    get
    {
        return Enumerable.Empty<Result>();
    }
}

public IEnumerable<Result> Results => Enumerable.Empty<Result>();
----

== Exceptions

Although ``++string++`` is a collection, the rule won't report on it.


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

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

include::../message.adoc[]

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

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