Guard Clause Custom Extension

StringLengthGuard.cs

public static class StringLengthGuard
{
    public static string StringLength(this IGuardClause guardClause,
        string input,
        int maxLength,
        [CallerArgumentExpression("input")] string? parameterName = null)
    {
        if (input?.Length > maxLength)
            throw new ArgumentException($"Cannot exceed string length of {maxLength}", parameterName);

        return input!;
    }
}