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

Initializes a new instance of the ConcurrentDictionary<TKey, TValue> class that contains elements copied from the specified IEnumerable, and uses the specified System.Collections.Generic.IEqualityComparer<T>.

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

public ConcurrentDictionary(
	int concurrencyLevel,
	IEnumerable<KeyValuePair<TKey, TValue>> collection,
	IEqualityComparer<TKey> comparer
)

Parameters

concurrencyLevel
Type: System.Int32

The estimated number of threads that will update the ConcurrentDictionary<TKey, TValue> concurrently.

collection
Type: System.Collections.Generic.IEnumerable<KeyValuePair<TKey, TValue>>

The System.Collections.Generic.IEnumerable<T> whose elements are copied to the new ConcurrentDictionary<TKey, TValue>.

comparer
Type: System.Collections.Generic.IEqualityComparer<TKey>

The System.Collections.Generic.IEqualityComparer<T> implementation to use when comparing keys.

ExceptionCondition
ArgumentNullException

collection or comparer is null.

ArgumentOutOfRangeException

concurrencyLevel is less than 1.

ArgumentException

collection contains one or more duplicate keys.

.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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