Code Inspection: Non-accessed positional property (private accessibility)

C# 9 record syntax defines a bunch of members implicitly, including Equals()/GetHashCode()/ToString() implementations, properties corresponding to primary constructor parameters, and the Deconstruct() method.

Taking into account all these implicit definitions, JetBrains Rider reports positional properties of records that are never accessed.

  class Test
  {
    record Person(
      string Name,
      int Age, // non-accessed positional property
      object Tag
    );

    public void PrintName()
    {
      var (name, _, tag) = GetPerson();
      Console.WriteLine(name);
    }

    private Person GetPerson() => new("Alex", 32, null);
  }

        

   class Test
  {
    record Person(
      string Name,
      object Tag
    );

    public void PrintName()
    {
      var (name, tag) = GetPerson();
      Console.WriteLine(name);
    }

    private Person GetPerson() => new("Alex", null);
  }

        

To make removal of redundant positional members safe, the Remove unused property quick-fix (Alt+Enter) invokes the Safe Delete refactoring to support all record usage patterns. In the example above, JetBrains Rider recognizes indirect usages in all C# deconstruction forms and is able to remove the corresponding _ from such deconstructions.

Last modified: 04 January 2022