rspec/rules/S2114/csharp/rule.adoc

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Passing a collection as an argument to the collection's own method is either an error - some other argument was intended - or simply nonsensical code.
Further, because some methods require that the argument remain unmodified during the execution, passing a collection to itself can result in an unexpected behavior.
== Noncompliant Code Example
----
var list = new List<int>();
list.AddRange(list); // Noncompliant
list.Concat(list); // Noncompliant
list.Union(list); // Noncompliant; always returns list
list.Except(list); // Noncompliant; always empty
list.Intersect(list); // Noncompliant; always list
list.SequenceEqual(list); // Noncompliant; always true
var set = new HashSet<int>();
set.UnionWith(set); // Noncompliant; no changes
set.ExceptWith(set); // Noncompliant; always empty
set.IntersectWith(set); // Noncompliant; no changes
set.IsProperSubsetOf(set); // Noncompliant; always false
set.IsProperSupersetOf(set); // Noncompliant; always false
set.IsSubsetOf(set); // Noncompliant; always true
set.IsSupersetOf(set); // Noncompliant; always true
set.Overlaps(set); // Noncompliant; always true
set.SetEquals(set); // Noncompliant; always true
set.SymmetricExceptWith(set); // Noncompliant; always empty
----
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[]