Export (0) Print
Expand All

IReadOnlyDictionary<TKey, TValue>::ContainsKey Method

.NET Framework 4.5

Determines whether the read-only dictionary contains an element that has the specified key.

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

bool ContainsKey(
	TKey key
)

Parameters

key
Type: TKey

The key to locate.

Return Value

Type: System::Boolean
true if the read-only dictionary contains an element that has the specified key; otherwise, false.

ExceptionCondition
ArgumentNullException

key is nullptr.

Implementations can vary in how they determine the equality of objects; for example, the class that implements IReadOnlyDictionary<TKey, TValue> might use the Comparer<T>::Default property, or it might implement the IComparer<T> method.

Implementations can vary in whether they allow key to be nullptr.

.NET Framework

Supported in: 4.6, 4.5

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Show:
© 2015 Microsoft