/// <summary>
/// Returns true if a string contains a substring, using the specified StringComparison.
/// </summary>
public static bool Contains(this string s, string value, StringComparison sc)
{
CompareOptions co;
switch (sc)
{
case StringComparison.CurrentCulture: co = CompareOptions.None; break;
case StringComparison.CurrentCultureIgnoreCase: co = CompareOptions.IgnoreCase; break;
case StringComparison.InvariantCulture: co = CompareOptions.None; break;
case StringComparison.InvariantCultureIgnoreCase: co = CompareOptions.IgnoreCase; break;
case StringComparison.Ordinal: co = CompareOptions.Ordinal; break;
case StringComparison.OrdinalIgnoreCase: co = CompareOptions.OrdinalIgnoreCase; break;
default: throw new InvalidOperationException("Unknown string comparison value.");
}
return(s.Contains(value, sc.RelatedCulture(), co));
}