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.
Namespace: System.Collections.Generic
Assembly: System (in System.dll)
Syntax
Private Function Contains ( _
key As Object _
) As Boolean Implements IDictionary.Contains
bool IDictionary.Contains(
Object key
)
Parameters
- key
Type: System..::.Object
The key to locate in the IDictionary.
Return Value
Type: System..::.Boolean
true if the IDictionary contains an element with the key; otherwise, false.
Implements
IDictionary..::.Contains(Object)
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | key is nullNothingnullptra null reference (Nothing in Visual Basic). |
Remarks
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.
Examples
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.
Version Information
Windows Phone OS
Supported in: 8.1, 8.0