OrderedDictionary.Item Property (Object)
Gets or sets the value 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 of the 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 element using the specified key.
This property allows you to access a specific element in the collection by using the following syntax: myCollection[key].
You can also use the Item property to add new elements by setting the value of a key that does not exist in the OrderedDictionary collection (for example, myCollection["myNonexistentKey"] = myValue). However, if the specified key already exists in the OrderedDictionary, setting the Item 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 be. 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 OrderedDictionary.
The following code example demonstrates the modification of an OrderedDictionary collection. In this example, the Item property is used to modify the dictionary entry with the key "testKey2". This code is part of a larger code example that can be viewed at OrderedDictionary.