Gets an object that can be used to synchronize access to a DictionaryBase object.
Assembly: mscorlib (in mscorlib.dll)
Derived classes can provide their own synchronized version of the DictionaryBase class using the SyncRoot property. The synchronizing code must perform operations on the SyncRoot property of the DictionaryBase object, not directly on the DictionaryBase object. This ensures proper operation of collections that are derived from other objects. Specifically, it maintains proper synchronization with other threads that might be simultaneously modifying the DictionaryBase object.
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 property during the entire enumeration.
Dim myCollection As ICollection = New ShortStringDictionary() SyncLock myCollection.SyncRoot For Each item In myCollection ' Insert your code here. Next item End SyncLock
Retrieving the value of this property is an O(1) operation.
Available since 10
Available since 1.1