rspec/rules/S2291/csharp/rule.adoc

``++Enumerable.Sum()++`` always executes addition in a ``++checked++`` context, so an ``++OverflowException++`` will be thrown if the value exceeds ``++MaxValue++`` even if an ``++unchecked++`` context was specified. Using an ``++unchecked++`` context anyway represents a misunderstanding of how ``++Sum++`` works.


This rule raises an issue when an ``++unchecked++`` context is specified for a ``++Sum++`` on integer types.


== Noncompliant Code Example

----
void Add(List<int> list)
{
  int d = unchecked(list.Sum());  // Noncompliant

  unchecked 
  {
    int e = list.Sum();  // Noncompliant
  }
}
----


== Compliant Solution

----
void Add(List<int> list)
{
  int d = list.Sum();

  try 
  {
    int e = list.Sum();
  } 
  catch (System.OverflowException e) 
  {
    // exception handling...
  }
}
----


== Exceptions

When the ``++Sum()++`` call is inside a ``++try-catch++`` block, no issues are reported.

----
void Add(List<int> list)
{
  unchecked 
  {
    try 
    {
      int e = list.Sum();
    } 
    catch (System.OverflowException e) 
    {
      // exception handling...
    }
  }
}
----



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[]