///<summary>
/// Checks if the specified string contains the specified substring, using the specified comparison type.
///</summary>
///<param name="s">The string in which to seek a substring.</param>
///<param name="subString">The string to seek.</param>
///<param name="comparisonType">The type of comparison to use.</param>
///<exception cref="ArgumentNullException">s or subString is null.</exception>
///<exception cref="ArgumentOutOfRangeException">comparisonType is not a valid StringComparison value.</exception>
///<returns>true si <c>s</c> contains <c>subString</c>, or if <c>subString</c> is an empty string; otherwise, false.</returns>
public static bool Contains([NotNull] this string s, string subString, StringComparison comparisonType)
{
s.CheckArgumentNull(nameof(s));
subString.CheckArgumentNull(nameof(subString));
comparisonType.CheckArgumentInEnum(nameof(comparisonType));
return(s.IndexOf(subString, comparisonType) >= 0);
}