ICollection.IsSynchronized Property
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ReadOnlyCollectionBase.ICollection.IsSynchronized Property

 

Gets a value indicating whether access to a ReadOnlyCollectionBase object is synchronized (thread safe).

Namespace:   System.Collections
Assembly:  mscorlib (in mscorlib.dll)

Private ReadOnly Property IsSynchronized As Boolean Implements ICollection.IsSynchronized

Property Value

Type: System.Boolean

true if access to the ReadOnlyCollectionBase object is synchronized (thread safe); otherwise, false. The default is false.

A ReadOnlyCollectionBase object is not synchronized. Derived classes can provide a synchronized version of the ReadOnlyCollectionBase class using the SyncRoot property.

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.

' Get the ICollection interface from the ReadOnlyCollectionBase
' derived class.
Dim myCollection As ICollection = myReadOnlyCollection
SyncLock myCollection.SyncRoot
    For Each item As Object In myCollection
        ' Insert your code here.
    Next item
End SyncLock

Retrieving the value of this property is an O(1) operation.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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