HybridDictionary.Item Property (Object)

 

Gets or sets the value associated with the specified key.

Namespace:   System.Collections.Specialized
Assembly:  System (in System.dll)

abstract Item : 
        key:Object -> Object with get, set
override Item : 
        key:Object -> Object with get, set

Parameters

key
Type: System.Object

The key whose value to get or set.

Property Value

Type: System.Object

The value associated with the specified key. If the specified key is not found, attempting to get it returns null, and attempting to set it creates a new entry using the specified key.

Exception Condition
ArgumentNullException

key is null.

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 Item 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 Item property overwrites the old value. In contrast, the Add method does not modify existing elements.

A key cannot be null, but a value can. To distinguish between null that is returned because the specified key is not found and null that is returned because the value of the specified key is null, use the Contains method to determine if the key exists in the list.

The C# language uses the keyword to define the indexers instead of implementing the Item property. Visual Basic implements Item 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.

The following code example enumerates the elements of a HybridDictionary.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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