Dictionary<TKey, TValue>.ICollection.IsSynchronized Property
Gets a value indicating whether access to the ICollection is synchronized (thread safe).
Assembly: mscorlib (in mscorlib.dll)
Property ValueType: 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.
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.
Getting the value of this property is an O(1) operation.
.NET FrameworkSupported in: 4.5, 4, 3.5, 3.0, 2.0
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Windows Phone 8.1, Windows Phone 8, 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.