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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)

bool ICollection.IsSynchronized { get; }

Property Value

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

Implements

ICollection.IsSynchronized

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.
ICollection myCollection = myReadOnlyCollection;
lock(myCollection.SyncRoot)
{
    foreach (object item in myCollection)
    {
        // Insert your code here.
    }
}

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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