System.Collections.ArrayList.Remove Method

Removes the first occurrence of a specific object from the ArrayList.


public virtual void Remove (object obj)


The object to remove from the ArrayList. The value can be null.


NotSupportedExceptionThe current instance is read-only or has a fixed size.


If the ArrayList does not contain the specified object, the ArrayList remains unchanged. No exception is thrown.

This method performs a linear search; therefore, this method is an O(n) operation, where n is ArrayList.Count.

This method determines equality by calling object.Equals(object).

In collections of contiguous elements, such as lists, the elements that follow the removed element move up to occupy the vacated spot. If the collection is indexed, the indexes of the elements that are moved are also updated. This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.


Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0,,