Redundant Select — CodeQL query help documentation
CodeQL docs
Redundant Select
ID: cs/linq/useless-select
Kind: problem
Security severity:
Severity: warning
Precision: very-high
Tags:
- quality
- maintainability
- useless-code
- language-features
- external/cwe/cwe-561
Query suites:
- csharp-code-quality.qls
- csharp-security-and-quality.qls
Click to see the query in the CodeQL repository
Passing an identity function to LINQ’s Select method (either explicitly or implicitly) yields a sequence that is the same as the one on which Select was called - such a call is redundant.
Recommendation
Remove the redundant select method call.
Example
In this example the call to the Select method has no effect and can be removed.
class RedundantSelect
{
static void Main(string[] args)
{
List<int> lst = Enumerable.Range(1, 10).ToList();
foreach (int i in lst.Select(e => e).Where(e => e % 2 == 0))
{
Console.WriteLine(i);
}
}
}