/// <summary>
/// The same as Distinct only it receives a selector function instead of a comparer (thus easier to use).
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <returns></returns>
public static IEnumerable <TSource> DistinctBy <TSource, TValue>(this IEnumerable <TSource> source, Func <TSource, TValue> selector)
{
var comparer = DistinctByComparer <TSource> .CompareBy(
selector, EqualityComparer <TValue> .Default);
return(new HashSet <TSource>(source, comparer));
}
public static IEnumerable <T> DistinctBy <T>(this IEnumerable <T> ienumerable, Expression <Func <T, object> > property)
{
var valueFunc = property.Compile();
var distinctByComparer = new DistinctByComparer <T>(valueFunc);
return(ienumerable.Distinct(distinctByComparer));
}
