IDictionary::Contains Method
Determines whether the IDictionary object contains an element with the specified key.
Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Parameters
- key
- Type: System::Object
The key to locate in the IDictionary object.
Return Value
Type: System::Booleantrue if the IDictionary contains an element with the key; otherwise, false.
| Exception | Condition |
|---|---|
| ArgumentNullException | key is nullptr. |
Implementations can vary in whether they allow the key to be nullptr.
Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.
The following code example demonstrates how to implement the Contains method. This code example is part of a larger example provided for the IDictionary class.
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