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Dictionary<TKey, TValue>::ICollection<KeyValuePair<TKey, TValue>>::Contains Method

Determines whether the ICollection<T> contains a specific key and value.

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

virtual bool Contains(
	KeyValuePair<TKey, TValue> keyValuePair
) sealed = ICollection<KeyValuePair<TKey, TValue>>::Contains


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

The KeyValuePair<TKey, TValue> structure to locate in the ICollection<T>.

Return Value

Type: System::Boolean
true if keyValuePair is found in the ICollection<T>; otherwise, false.



This method determines equality using the default equality comparer EqualityComparer<T>::Default for the System.Collections.Generic::KeyValuePair<TKey, TValue> structure.

This method approaches an O(1) operation.

The following example shows how to use the ICollection<KeyValuePair<TKey, TValue>>::Add, ICollection<KeyValuePair<TKey, TValue>>::Contains, ICollection<KeyValuePair<TKey, TValue>>::CopyTo, and ICollection<KeyValuePair<TKey, TValue>>::Remove methods of the System.Collections.Generic::ICollection<T> generic interface to manipulate a Dictionary<TKey, TValue> object.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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