Elegant way of converting between StringComparison and StringComparer?

Question

Some .NET methods use StringComparison as parameter, some use StringComparer (often in form of IComparer). The difference is clear. Is there some elegant way how to get

Answer 1

An a complete extension method for any one who needs quick copy+paste:

public static class StringComparisonExtensions
{
  // from http://stackoverflow.com/a/32764112/548304
  private static readonly Dictionary> ComparsionToComparer =
    new Dictionary>
      {
        [StringComparison.CurrentCulture] = () => StringComparer.CurrentCulture,
        [StringComparison.CurrentCultureIgnoreCase] = () => StringComparer.CurrentCultureIgnoreCase,
        [StringComparison.InvariantCulture] = () => StringComparer.InvariantCulture,
        [StringComparison.InvariantCultureIgnoreCase] = () => StringComparer.InvariantCultureIgnoreCase,
        [StringComparison.Ordinal] = () => StringComparer.Ordinal,
        [StringComparison.OrdinalIgnoreCase] = () => StringComparer.OrdinalIgnoreCase
      };

  /// 

  ///  Retrieves a string comparer for the given StringComparison.
  /// 
  public static StringComparer ToComparer(this StringComparison comparison)
  {
    return ComparsionToComparer.GetValueOrDefault(comparison)?.Invoke();
  }
}