String extensions

StringExtensions.cs

namespace System
{
    public static class StringExtensions
    {
        public static bool Contains(this string source, string toCheck, StringComparison comp)
        {
            return source?.IndexOf(toCheck, comp) >= 0;
        }

        public static bool IsNullOrEmpty(this String @string)
        {
            return String.IsNullOrEmpty(@string);
        }

        public static bool IsNullOrWhiteSpace(this String @string)
        {
            return String.IsNullOrWhiteSpace(@string);
        }

        public static string SafeSubstring(this string text, int start, int length)
        {
            if (text == null)
            {
                return null;
            }
            return text.Length <= start ? ""
                : text.Length - start <= length ? text.Substring(start)
                : text.Substring(start, length);
        }

        public static bool SafeContains(this string text, string searchTerm)
        {
            if (text.IsNullOrEmpty())
            {
                return false;
            }
            return text.Contains(searchTerm);
        }

        public static bool SafeStartsWith(this string text, string searchTerm)
        {
            if (text.IsNullOrEmpty())
            {
                return false;
            }
            return text.StartsWith(searchTerm);
        }
    }
}