Gets or sets the value associated with the specified key.
Assembly: System (in System.dll)
abstract Item : key:Object -> Object with get, set override Item : key:Object -> Object with get, set
- Type: System.Object
The key whose value to get or set.
Property ValueType: System.Object
The value associated with the specified key. If the specified key is not found, attempting to get it returns a null reference (Nothing in Visual Basic), and attempting to set it creates a new entry using the specified key.
This property provides the ability to access a specific element in the collection by using the following syntax: myCollection[key].
You can also use the property to add new elements by setting the value of a key that does not exist in the HybridDictionary; for example, myCollection["myNonexistentKey"] = myValue. However, if the specified key already exists in the HybridDictionary, setting the property overwrites the old value. In contrast, the Add method does not modify existing elements.
A key cannot be a null reference (Nothing in Visual Basic), but a value can. To distinguish between a null reference (Nothing in Visual Basic) that is returned because the specified key is not found and a null reference (Nothing in Visual Basic) that is returned because the value of the specified key is a null reference (Nothing in Visual Basic), use the Contains method to determine if the key exists in the list.
The C# language uses the this keyword to define the indexers instead of implementing the property. Visual Basic implements as a default property, which provides the same indexing functionality.
Retrieving the value of this property is an O(1) operation; setting the property is also an O(1) operation.