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

Initializes a new instance of the ConcurrentDictionary<TKey, TValue> class that is empty, has the specified concurrency level and capacity, and uses the default comparer for the key type.

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

public ConcurrentDictionary(
	int concurrencyLevel,
	int capacity


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.


concurrencyLevel is less than 1.


capacity is less than 0.

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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