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ConcurrentDictionary<TKey, TValue> Constructor (Int32, Int32, IEqualityComparer<TKey>)

Initializes a new instance of the ConcurrentDictionary<TKey, TValue> class that is empty, has the specified concurrency level, has the specified initial capacity, and uses the specified IEqualityComparer<TKey>.

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

public ConcurrentDictionary(
	int concurrencyLevel,
	int capacity,
	IEqualityComparer<TKey> comparer


Type: System.Int32
The estimated number of threads that will update the ConcurrentDictionary<TKey, TValue> concurrently.
Type: System.Int32
The initial number of elements that the ConcurrentDictionary<TKey, TValue> can contain.
Type: System.Collections.Generic.IEqualityComparer<TKey>
The IEqualityComparer<TKey> implementation to use when comparing keys.


comparer is a null reference (Nothing in Visual Basic).


concurrencyLevel is less than 1. -or- capacity is less than 0.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

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.