ArrayList.Synchronized Method (IList)
Returns an IList wrapper that is synchronized (thread safe).
Assembly: mscorlib (in mscorlib.dll)
<HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization := True)> Public Shared Function Synchronized ( list As IList ) As IList
To guarantee the thread safety of the ArrayList, all operations must be done through this wrapper.
Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.
The following code example shows how to lock the collection using the SyncRoot during the entire enumeration.
Dim myCollection As New ArrayList() SyncLock myCollection.SyncRoot For Each item As Object In myCollection ' Insert your code here. Next item End SyncLock
This method is an O(1) operation.
Available since 10
Available since 1.1