HybridDictionary.SyncRoot Property


Gets an object that can be used to synchronize access to the HybridDictionary.

 property System::Object ^ SyncRoot { System::Object ^ get(); };
public object SyncRoot { get; }
member this.SyncRoot : obj
Public ReadOnly Property SyncRoot As Object

Property Value


An object that can be used to synchronize access to the HybridDictionary.



The following code example shows how to lock the collection using the SyncRoot during the entire enumeration.

HybridDictionary^ myCollection = gcnew HybridDictionary();
bool lockTaken = false;
    Monitor::Enter(myCollection->SyncRoot, lockTaken);
    for each (Object^ item in myCollection)
        // Insert your code here.
    if (lockTaken)
HybridDictionary myCollection = new HybridDictionary();
    foreach (object item in myCollection)
        // Insert your code here.
Dim myCollection As New HybridDictionary()
SyncLock myCollection.SyncRoot
    For Each item In myCollection
        ' Insert your code here.
End SyncLock

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


Derived classes can provide their own synchronized version of the HybridDictionary using the SyncRoot property. The synchronizing code must perform operations on the SyncRoot of the HybridDictionary, not directly on the HybridDictionary. This ensures proper operation of collections that are derived from other objects. Specifically, it maintains proper synchronization with other threads that might be simultaneously modifying the HybridDictionary object.

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.

Applies to

See also