Code inspection: Merge nested property patterns

tip

You can suppress this inspection to ignore specific issues, change its severity level to make the issues less or more noticeable, or disable it altogether.

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 ( ):

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();
}

tip

Reverse transformation is available with a context action .