public static ILookup <TKey, TElement> ToLookup <TSource, TKey, TElement>(
this IEnumerable <TSource> source,
Func <TSource, TKey> keySelector,
Func <TSource, TElement> elementSelector)
{
return(Lookup <TKey, TElement> .Create(source, keySelector, elementSelector, null));
}
public static ILookup <TKey, TSource> ToLookup <TSource, TKey>(
this IEnumerable <TSource> source,
Func <TSource, TKey> keySelector,
IEqualityComparer <TKey> comparer)
{
return(Lookup <TKey, TSource> .Create(source, keySelector, x => x, comparer));
}
public static IEnumerable <IGrouping <TKey, TElement> > GroupBy <TSource, TKey, TElement>(
this IEnumerable <TSource> source,
Func <TSource, TKey> keySelector,
Func <TSource, TElement> elementSelector,
IEqualityComparer <TKey> comparer)
{
return(Lookup <TKey, TElement> .Create(source, keySelector, elementSelector, comparer));
}
public static ILookup <TKey, TSource> ToLookup <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, IEqualityComparer <TKey> comparer)
{
if (source == null)
{
throw Error.ArgumentNull("source");
}
if (keySelector == null)
{
throw Error.ArgumentNull("keySelector");
}
return(Lookup <TKey, TSource> .Create(source, keySelector, comparer));
}
public static ILookup <TKey, TSource> ToLookup <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, IEqualityComparer <TKey>?comparer)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
if (keySelector == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.keySelector);
}
return(Lookup <TKey, TSource> .Create(source, keySelector, comparer));
}
public static ILookup <TKey, TElement> ToLookup <TSource, TKey, TElement>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, TElement> elementSelector, IEqualityComparer <TKey> comparer)
{
if (source == null)
{
throw Error.ArgumentNull(nameof(source));
}
if (keySelector == null)
{
throw Error.ArgumentNull(nameof(keySelector));
}
if (elementSelector == null)
{
throw Error.ArgumentNull(nameof(elementSelector));
}
return(Lookup <TKey, TElement> .Create(source, keySelector, elementSelector, comparer));
}
public static ILookup <TKey, TSource> ToLookup <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector)
{
return(Lookup <TKey, TSource> .Create(source, keySelector, FuncHelper.GetIdentityFunc <TSource>(), null));
}
public IEnumerator <IGrouping <TKey, TElement> > GetEnumerator() => Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer).GetEnumerator();
public IEnumerator <TResult> GetEnumerator()
{
Lookup <TKey, TElement> lookup = Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer);
return(lookup.ApplyResultSelector(_resultSelector).GetEnumerator());
}
public IEnumerator <TResult> GetEnumerator()
{
return(Lookup <TKey, TElement> .Create <TSource>(this.source, this.keySelector, this.elementSelector, this.comparer).ApplyResultSelector <TResult>(this.resultSelector).GetEnumerator());
}
public TResult[] ToArray() => Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer).ToArray(_resultSelector);
public int GetCount(bool onlyIfCheap) => onlyIfCheap ? -1 : Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer).Count;
public List <IGrouping <TKey, TElement> > ToList()
{
IIListProvider <IGrouping <TKey, TElement> > lookup = Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer);
return(lookup.ToList());
}
public List <TResult> ToList() => Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer).ToList(_resultSelector);
public IEnumerator <IGrouping <TKey, TElement> > GetEnumerator()
{
return(Lookup <TKey, TElement> .Create <TSource>(this.source, this.keySelector, this.elementSelector, this.comparer).GetEnumerator());
}
public static ILookup <TKey, TSource> ToLookup <TSource, TKey>(this IEnumerable <TSource> source,
Func <TSource, TKey> keySelector)
{
return(Lookup <TKey, TSource> .Create(source, keySelector, x => x, null));
}
