IReadOnlyDictionary<TKey,TValue>.ContainsKey(TKey) Method
Definition
Important
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Determines whether the read-only dictionary contains an element that has the specified key.
public:
bool ContainsKey(TKey key);public bool ContainsKey (TKey key);abstract member ContainsKey : 'Key -> boolPublic Function ContainsKey (key As TKey) As BooleanParameters
- key
- TKey
The key to locate.
Returns
true if the read-only dictionary contains an element that has the specified key; otherwise, false.
Exceptions
key is null.
Remarks
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 null.
Applies to
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