Determines whether the collection contains an element that has the specified key.
Namespace: System.Web.Mvc
Assembly: System.Web.Mvc (in System.Web.Mvc.dll)
Syntax
'Declaration
Public Function ContainsKey ( _
key As String _
) As Boolean
public bool ContainsKey(
string key
)
public:
virtual bool ContainsKey(
String^ key
) sealed
Parameters
- key
Type: System.String
The key of the element to locate in the collection.
Return Value
Type: System.Boolean
true if the collection contains an element that has the specified key; otherwise, false.
Implements
IDictionary<TKey, TValue>.ContainsKey(TKey)
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | key is null reference (Nothing in Visual Basic). |