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DictionaryBase.ICollection.IsSynchronized Property

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

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

'Declaration
Private ReadOnly Property IsSynchronized As Boolean 
	Implements ICollection.IsSynchronized

Property Value

Type: System.Boolean
true if access to the DictionaryBase object is synchronized (thread safe); otherwise, false. The default is false.

Implements

ICollection.IsSynchronized

A DictionaryBase object is not synchronized. Derived classes can provide a synchronized version of the DictionaryBase 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.

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.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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