Dictionary<TKey, TValue>::IDictionary::Contains Method (Object^)
Determines whether the IDictionary contains an element with the specified key.
Assembly: mscorlib (in mscorlib.dll)
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 specified key; otherwise, false.
Implements
IDictionary::Contains(Object^)| Exception | Condition |
|---|---|
| ArgumentNullException | key is null. |
This method returns false if key is of a type that is not assignable to the key type TKey of the Dictionary<TKey, TValue>.
This method approaches an O(1) operation.
The following code example shows how to use the IDictionary::Contains method of the System.Collections::IDictionary interface with a Dictionary<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.
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1