This documentation is archived and is not being maintained.

SynchronizedKeyedCollection<K, T> Constructor (Object, IEqualityComparer<K>, Int32)

Initializes a new instance of the SynchronizedKeyedCollection<K, T> class with access synchronized by an explicitly specified object and with keys compared in a specified way.

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

protected SynchronizedKeyedCollection(
	Object syncRoot,
	IEqualityComparer<K> comparer,
	int dictionaryCreationThreshold


Type: System.Object
The object used to synchronize access to the thread-safe collection.
Type: System.Collections.Generic.IEqualityComparer<K>
The IEqualityComparer<T> of type K used to compare key objects of type K for equality.
Type: System.Int32
The number of items required to create a dictionary for the collection.


syncRoot is null or comparer is null.


dictionaryCreationThreshold is less than -1.

Setting dictionaryCreationThreshold to -1 assigns the MaxValue (2,147,483,647; hexadecimal 0x7FFFFFFF) to it.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.