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Dictionary<TKey, TValue>.ICollection.IsSynchronized Property

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets a value indicating whether access to the ICollection is synchronized (thread safe).

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

Syntax

'Declaration
Private ReadOnly Property IsSynchronized As Boolean
    Implements ICollection.IsSynchronized
bool ICollection.IsSynchronized { get; }

Property Value

Type: System.Boolean
true if access to the ICollection is synchronized (thread safe); otherwise, false. In the default implementation of Dictionary<TKey, TValue>, this property always returns false.

Implements

ICollection.IsSynchronized

Remarks

Default implementations of collections in the System.Collections.Generic namespace are not synchronized.

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 can cause 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 SyncRoot property returns an object that can be used to synchronize access to the ICollection. Synchronization is effective only if all threads lock the object before accessing the collection.

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

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.