Code inspection: Move to extension block

C# 14 introduces extension blocks as a new way to declare extension methods, which is an elegant way to declare several methods for the same extended type. Therefore, JetBrains Rider suggests moving extension methods that target a specific extended type into the extension block that match that extended type. For example:

            
public static class StringExtensions
{
    extension(string str)
    {
        public bool IsNullOrEmpty()
        {
            return string.IsNullOrEmpty(str);
        }

        public bool IsNullOrWhiteSpace()
        {
            return string.IsNullOrWhiteSpace(str);
        }
    }

    public static string TrimStart(this string str, string prefix)
    {
        if (str.StartsWith(prefix))
            return str.Substring(prefix.Length);
        return str;
    }
}

        

            
public static class StringExtensions
{
    extension(string str)
    {
        public bool IsNullOrEmpty()
        {
            return string.IsNullOrEmpty(str);
        }

        public bool IsNullOrWhiteSpace()
        {
            return string.IsNullOrWhiteSpace(str);
        }

        public string TrimStart(string prefix)
        {
            if (str.StartsWith(prefix))
                return str.Substring(prefix.Length);
            return str;
        }
    }
}

        

12 November 2025