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);C#
public bool ContainsKey(TKey key);abstract member ContainsKey : 'Key -> boolPublic Function ContainsKey (key As TKey) As Boolean- key
- TKey
The key to locate.
true if the read-only dictionary contains an element that has the specified key; otherwise, false.
key is null.
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
| Product | Versions |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
| UWP | 10.0 |
