Re: Generic List - Split list
- From: "Bruce Wood" <brucewood@xxxxxxxxxx>
- Date: 3 Nov 2006 10:54:47 -0800
maxtoroq wrote:
I know how to work the .FindAll method of the List class, but is there
a way to split a list into 2 lists, one containing all the items that
match a certain criteria and one that doesn't?
No, but it would be pretty simple to write one. Off the top of my head:
public static void SplitList<T>(List<T> list, Predicate<T> match, out
List<T> matchedList, out List<T> didNotMatchList)
{
matchedList = new List<T>();
didNotMatchList = new List<T>();
foreach (T item in list)
{
if (match(item))
{
matchedList.Add(item);
}
else
{
didNotMatchList.Add(item);
}
}
}
If you're using C# 3.0 (I think it is) you can also do that funky
extension method thing to add the method directly to List<T> (although
I'm not 100% sure that they work with generics):
public static class Extensions
{
public static void Split<T>(this List<T> list, Predicate<T> match,
out List<T> matchedList, out List<T> didNotMatchList)
{
matchedList = new List<T>();
didNotMatchList = new List<T>();
foreach (T item in list)
{
if (match(item))
{
matchedList.Add(item);
}
else
{
didNotMatchList.Add(item);
}
}
}
}
Then you could invoke it like this:
myList.Split(matchPredicate, out matchedList, out didNotMatchList);
.
- References:
- Generic List - Split list
- From: maxtoroq
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