public static IEnumerable <T> Merge <T>(this IEnumerable <T> enumerable1, IEnumerable <T> enumerable2, OnMergeConflict onMergeConflict = OnMergeConflict.ReturnFirstAndSecond, Func <T, T, T> function = null)
{
return(Merge <T>(enumerable1, enumerable2, Comparer <T> .Default, onMergeConflict, function));
}
public static IEnumerable <T> Merge <T>(this IEnumerable <T> collection1, IEnumerable <T> collection2, IComparer <T> comparer, OnMergeConflict onConflict = OnMergeConflict.ReturnFirstAndSecond, Func <T, T, T> function = null)
{
var enumerator1 = collection1.GetEnumerator();
var enumerator2 = collection2.GetEnumerator();
bool haveNext1 = enumerator1.MoveNext();
bool haveNext2 = enumerator2.MoveNext();
if (haveNext1 && haveNext2)
{
var item1 = enumerator1.Current;
var item2 = enumerator2.Current;
while (true)
{
int cmp = comparer.Compare(item1, item2);
if (cmp < 0)
{
yield return(item1);
haveNext1 = enumerator1.MoveNext();
if (!haveNext1)
{
break;
}
item1 = enumerator1.Current;
}
else if (cmp > 0)
{
yield return(item2);
haveNext2 = enumerator2.MoveNext();
if (!haveNext2)
{
break;
}
item2 = enumerator2.Current;
}
else
{
switch (onConflict)
{
case OnMergeConflict.ReturnFirstAndSecond:
{
yield return(item1);
yield return(item2);
}
break;
case OnMergeConflict.ReturnFirst:
{
yield return(item1);
}
break;
case OnMergeConflict.ReturnSecond:
{
yield return(item2);
}
break;
case OnMergeConflict.ReturnByFunction:
{
yield return(function(item1, item2));
}
break;
//case OnMergeConflict.Skip:
// {
// }
// break;
}
haveNext1 = enumerator1.MoveNext();
haveNext2 = enumerator2.MoveNext();
if (!haveNext1 || !haveNext2)
{
break;
}
item1 = enumerator1.Current;
item2 = enumerator2.Current;
}
}
}
while (haveNext1)
{
yield return(enumerator1.Current);
haveNext1 = enumerator1.MoveNext();
}
while (haveNext2)
{
yield return(enumerator2.Current);
haveNext2 = enumerator2.MoveNext();
}
}
public static IEnumerable <T> Merge <T>(IEnumerable <T> enumerable1, IEnumerable <T> enumerable2, IComparer <T> comparer, OnMergeConflict onConflict = OnMergeConflict.ReturnFirstAndSecond, Func <T, T, T> function = null)
{
return(Merge(enumerable1.GetEnumerator(), enumerable2.GetEnumerator(), comparer, onConflict, function));
}
