/// <summary>
/// Check if property is in list values.
/// </summary>
/// <param name="values">List of values.</param>
/// <param name="comparer">An optionnal equality comparer to compare value.</param>
/// <returns>Current instance.</returns>
public PropertyValidator <TRow> IsStringValues(string[] values, IEqualityComparer <string> comparer = null)
{
StringRule <TRow> method = new StringRule <TRow>((x) => this.getter(x));
method.IsStringValues(values, comparer);
this.validationRules.Add(method);
return(this);
}