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
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
ReadOnly Property IsSynchronized As Boolean
bool IsSynchronized { get; }
Property Value
Type: System.Boolean
true if access to the ICollection is synchronized (thread safe); otherwise, false.
Remarks
SyncRoot returns an object, which can be used to synchronize access to the ICollection.
Most collection classes in the System.Collections namespace also implement a Synchronized method, which provides a synchronized wrapper around the underlying collection.
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.
ICollection myCollection;
// Instantiate and populate the collection
lock(myCollection.SyncRoot) {
foreach (Object item in myCollection) {
// Insert your code here.
}
}
Dim myCollection
' Instantiate and populate the collection
Dim item As Object
SyncLock myCollection.SyncRoot
For Each item In myCollection
' Insert your code here.
Next item
End SyncLock
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.