List<T>.ICollection.SyncRoot Property

 

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

Namespace:   System.Collections.Generic
Assembly:  mscorlib (in mscorlib.dll)

object ICollection.SyncRoot { get; }

Property Value

Type: System.Object

An object that can be used to synchronize access to the ICollection. In the default implementation of List<T>, this property always returns the current instance.

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.

SyncRoot returns an object that can be used to synchronize access to the ICollection. Synchronization is effective only if all threads lock this 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.
}

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

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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