OrderedDictionary.Add Method

Adds an entry with the specified key and value into the OrderedDictionary collection with the lowest available index.

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

public void Add(
	Object key,
	Object value
)

Parameters

key
Type: System.Object

The key of the entry to add.

value
Type: System.Object

The value of the entry to add. This value can be null.

Implements

IDictionary.Add(Object, Object)

ExceptionCondition
NotSupportedException

The OrderedDictionary collection is read-only.

A key cannot be null, but a value can be.

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; 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.

The following code example demonstrates the creation and population of an OrderedDictionary collection. This code is part of a larger code example that can be viewed at OrderedDictionary.

// Creates and initializes a OrderedDictionary.
OrderedDictionary myOrderedDictionary = new OrderedDictionary();
myOrderedDictionary.Add("testKey1", "testValue1");
myOrderedDictionary.Add("testKey2", "testValue2");
myOrderedDictionary.Add("keyToDelete", "valueToDelete");
myOrderedDictionary.Add("testKey3", "testValue3");

ICollection keyCollection = myOrderedDictionary.Keys;
ICollection valueCollection = myOrderedDictionary.Values;

// Display the contents using the key and value collections
DisplayContents(keyCollection, valueCollection, myOrderedDictionary.Count);

.NET Framework

Supported in: 4.6, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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