ArrayList.Remove Method (Object)
Removes the first occurrence of a specific object from the ArrayList.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- obj
-
Type:
System.Object
The Object to remove from the ArrayList. The value can be null.
Implements
IList.Remove(Object)| Exception | Condition |
|---|---|
| NotSupportedException |
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 Count.
This method determines equality by calling Object.Equals.
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.
The following code example shows how to remove elements from the ArrayList.
Imports System Imports System.Collections Imports Microsoft.VisualBasic Public Class SamplesArrayList Public Shared Sub Main() ' Creates and initializes a new ArrayList. Dim myAL As New ArrayList() myAL.Add("The") myAL.Add("quick") myAL.Add("brown") myAL.Add("fox") myAL.Add("jumped") myAL.Add("over") myAL.Add("the") myAL.Add("lazy") myAL.Add("dog") ' Displays the ArrayList. Console.WriteLine("The ArrayList initially contains the following:") PrintValues(myAL) ' Removes the element containing "lazy". myAL.Remove("lazy") ' Displays the current state of the ArrayList. Console.WriteLine("After removing ""lazy"":") PrintValues(myAL) ' Removes the element at index 5. myAL.RemoveAt(5) ' Displays the current state of the ArrayList. Console.WriteLine("After removing the element at index 5:") PrintValues(myAL) ' Removes three elements starting at index 4. myAL.RemoveRange(4, 3) ' Displays the current state of the ArrayList. Console.WriteLine("After removing three elements starting at index 4:") PrintValues(myAL) End Sub Public Shared Sub PrintValues(myList As IEnumerable) Dim obj As [Object] For Each obj In myList Console.Write(" {0}", obj) Next obj Console.WriteLine() End Sub 'PrintValues End Class ' This code produces the following output. ' ' The ArrayList initially contains the following: ' The quick brown fox jumped over the lazy dog ' After removing "lazy": ' The quick brown fox jumped over the dog ' After removing the element at index 5: ' The quick brown fox jumped the dog ' After removing three elements starting at index 4: ' The quick brown fox
Available since 10
.NET Framework
Available since 1.1