I had previously posted a RemoveAll
extension method for the Dictionary<K,V> class, now it’s time to have one for the Collection<T> class.
The signature is the same as in the corresponding method already available in List<T> and the implementation relies on the RemoveAt method to perform the actual removal of each element.
Finally, here’s the code:
public static class CollectionExtensions
{
/// <summary>
/// Removes from the target collection all elements that match the specified predicate.
/// </summary>
/// <typeparam name="T">The type of elements in the target collection.</typeparam>
/// <param name="collection">The target collection.</param>
/// <param name="match">The predicate used to match elements.</param>
/// <exception cref="ArgumentNullException">
/// The target collection is a null reference.
/// <br />-or-<br />
/// The match predicate is a null reference.
/// </exception>
/// <returns>Returns the number of elements removed.</returns>
public static int RemoveAll<T>(this Collection<T> collection, Predicate<T> match)
{
if (collection == null)
throw new ArgumentNullException("collection");
if (match == null)
throw new ArgumentNullException("match");
int count = 0;
for (int i = collection.Count - 1; i >= 0; i--)
{
if (match(collection[i]))
{
collection.RemoveAt(i);
count++;
}
}
return count;
}
}
