SortedDictionary(Of TKey, TValue).IDictionary.Contains Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Determines whether the IDictionary contains an element with the specified key.
Assembly: System (in System.dll)
'Declaration Private Function Contains ( _ key As Object _ ) As Boolean Implements IDictionary.Contains
Parameters
- key
- Type: System.Object
The key to locate in the IDictionary.
Return Value
Type: System.Booleantrue if the IDictionary contains an element with the key; otherwise, false.
Implements
IDictionary.Contains(Object)| Exception | Condition |
|---|---|
| ArgumentNullException | key is Nothing. |
This method returns false if key is of a type that is not assignable to the key type TKey of the SortedDictionary(Of TKey, TValue).
This method is an O(log n) operation, where n is Count.
The following code example shows how to use the IDictionary.Contains method of the System.Collections.IDictionary interface with a SortedDictionary(Of TKey, TValue). The example demonstrates that the method returns false if a key of the wrong data type is supplied.
The code example is part of a larger example, including output, provided for the IDictionary.Add method.