Code inspection: Merge nested property patterns

C# 10 simplifies the pattern matching syntax with dotted access instead of object pattern nesting. JetBrains Rider detects such places in your code and suggests the corresponding quick-fix (Alt+Enter):

  public class UserTest
  {
    public UserTest()
    {
      var user = new User();
      // Merge nested property patterns
      if (user is { Tags: { Count: 0 } })
        Console.WriteLine("do something");
    }
  }

        

  public class UserTest
  {
    public UserTest()
    {
      var user = new User();
      if (user is { Tags.Count: 0})
        Console.WriteLine("do something");
    }
  }

        

  
  public class User
  {
    public List<string> Tags { get; } = new();
  }

Last modified: 08 April 2024