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ContainsKey Method

ConcurrentDictionary<TKey, TValue>.ContainsKey Method

.NET Framework 4.6 and 4.5

Determines whether the ConcurrentDictionary<TKey, TValue> contains the specified key.

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

public bool ContainsKey(
	TKey key
)

Parameters

key
Type: TKey

The key to locate in the ConcurrentDictionary<TKey, TValue>.

Return Value

Type: System.Boolean
true if the ConcurrentDictionary<TKey, TValue> contains an element with the specified key; otherwise, false.

Implements

IDictionary<TKey, TValue>.ContainsKey(TKey)
IReadOnlyDictionary<TKey, TValue>.ContainsKey(TKey)

ExceptionCondition
ArgumentNullException

key is null.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Portable Class Library

Supported in: Portable Class Library
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