public TResult TryGetLast(out bool found)
{
bool sourceFound;
TSource input = _source.TryGetLast(out sourceFound);
found = sourceFound;
return(sourceFound ? _selector(input) : default(TResult));
}
public static TSource Last <TSource>(this IEnumerable <TSource> source)
{
if (source == null)
{
throw Error.ArgumentNull(nameof(source));
}
IPartition <TSource> partition = source as IPartition <TSource>;
if (partition != null)
{
bool found;
TSource last = partition.TryGetLast(out found);
if (found)
{
return(last);
}
}
else
{
IList <TSource> list = source as IList <TSource>;
if (list != null)
{
int count = list.Count;
if (count > 0)
{
return(list[count - 1]);
}
}
else
{
using (IEnumerator <TSource> e = source.GetEnumerator())
{
if (e.MoveNext())
{
TSource result;
do
{
result = e.Current;
}while (e.MoveNext());
return(result);
}
}
}
}
throw Error.NoElements();
}
internal static TSource TryGetLast <TSource>(this IEnumerable <TSource> source, out bool found)
{
if (source == null)
{
throw Error.ArgumentNull(nameof(source));
}
IPartition <TSource> partition = source as IPartition <TSource>;
if (partition != null)
{
return(partition.TryGetLast(out found));
}
IList <TSource> list = source as IList <TSource>;
if (list != null)
{
int count = list.Count;
if (count > 0)
{
found = true;
return(list[count - 1]);
}
}
else
{
using (IEnumerator <TSource> e = source.GetEnumerator())
{
if (e.MoveNext())
{
TSource result;
do
{
result = e.Current;
}while (e.MoveNext());
found = true;
return(result);
}
}
}
found = false;
return(default(TSource));
}
