All rules
IDE0306Language rules (expression-level preferences)
Use collection expression for new
Use collection expression for new
Microsoft docsDescription
This rule flags places where a collection expression with a spread element (..) could be used to initialize a list instead of new. For example, this rule offers to simplify code like new List<...>(x) into the collection expression form ([.. x]).
Example
// Code with violation.
List<int> l1 = new List<int>(Enumerable.Range(1, 10));
List<int> m1 = new List<int>(new[] { 1, 2, 3 });
// Fixed code.
List<int> l1 = [.. Enumerable.Range(1, 10)];
List<int> m1 = [.. new[] { 1, 2, 3 }];Your vote
Group results
0 yes 0 no
ConsensusNone (disabled)
Severity preference (yes voters)
Suggestion0
Warning0
Error0