SortedList.SyncRoot Property

Definition

Namespace:

System.Collections

Assembly:

System.Collections.NonGeneric.dll

Source:

SortedList.cs

Gets an object that can be used to synchronize access to a SortedList object.

public:
 virtual property System::Object ^ SyncRoot { System::Object ^ get(); };

public virtual object SyncRoot { get; }

member this.SyncRoot : obj

Public Overridable ReadOnly Property SyncRoot As Object

Property Value

Object

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

Implements

SyncRoot

Examples

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

SortedList^ myCollection = gcnew SortedList();
bool lockTaken = false;
try
{
    Monitor::Enter(myCollection->SyncRoot, lockTaken);
    for each (Object^ item in myCollection);
    {
        // Insert your code here.
    }
}
finally
{
    if (lockTaken)
    {
        Monitor::Exit(myCollection->SyncRoot);
    }
}

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

Dim myCollection As New SortedList()
SyncLock myCollection.SyncRoot
    For Each item In myCollection
        ' Insert your code here.
    Next item
End SyncLock

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

Remarks

To create a synchronized version of the SortedList object, use the Synchronized method. However, derived classes can provide their own synchronized version of the SortedList using the SyncRoot property. The synchronizing code must perform operations on the SyncRoot of the SortedList, not directly on the SortedList. 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 SortedList 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.

See also

• IsSynchronized
• Synchronized(SortedList)