Dictionary<TKey,TValue>.ICollection.SyncRoot Property
Definition
Important
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Gets an object that can be used to synchronize access to the ICollection.
property System::Object ^ System::Collections::ICollection::SyncRoot { System::Object ^ get(); };object System.Collections.ICollection.SyncRoot { get; }member this.System.Collections.ICollection.SyncRoot : obj ReadOnly Property SyncRoot As Object Implements ICollection.SyncRootProperty Value
An object that can be used to synchronize access to the ICollection.
Implements
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. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.
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. The following code shows the use of the SyncRoot property for C#, C++, and Visual Basic.
ICollection ic = ...;
lock (ic.SyncRoot) {
// Access the collection.
}
Dim ic As ICollection = ...
SyncLock ic.SyncRoot
' Access the collection.
End SyncLock
ICollection^ ic = ...;
try {
Monitor::Enter(ic->SyncRoot);
// Access the collection.
}
finally {
Monitor::Exit(ic->SyncRoot);
}
Getting the value of this property is an O(1) operation.
