DictionaryBase.IDictionary.Contains Method (Object)
Determines whether the DictionaryBase contains a specific key.
Assembly: mscorlib (in mscorlib.dll)
private abstract Contains : key:Object -> bool private override Contains : key:Object -> bool
Return ValueType: System.Boolean
true if the DictionaryBase contains an element with the specified key; otherwise, false.
This method is an O(1) operation.
Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on key 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 key parameter on the objects in the collection.
Available since 10
Available since 1.1