Dictionary(TKey, TValue).ICollection(KeyValuePair(TKey, TValue)).Contains Method

Determines whether the ICollection(T) contains a specific key and value.

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

private abstract Contains : 
        keyValuePair:KeyValuePair<'TKey, 'TValue> -> bool  
private override Contains : 
        keyValuePair:KeyValuePair<'TKey, 'TValue> -> bool


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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library