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SortedDictionary.Add Method

Adds an element with the specified key and value into the SortedDictionary.

Namespace: System.Collections.Generic
Assembly: System (in system.dll)

public void Add (
	TKey key,
	TValue value
)
public final void Add (
	TKey key, 
	TValue value
)
public final function Add (
	key : TKey, 
	value : TValue
)
Not applicable.

Parameters

key

The key of the element to add.

value

The value of the element to add. The value can be a null reference (Nothing in Visual Basic) for reference types.

Exception typeCondition

ArgumentNullException

key is a null reference (Nothing in Visual Basic).

ArgumentException

An element with the same key already exists in the SortedDictionary.

You can also use the Item property to add new elements by setting the value of a key that does not exist in the SortedDictionary; for example, myCollection["myNonexistentKey"] = myValue (in Visual Basic, myCollection("myNonexistantKey") = myValue). However, if the specified key already exists in the SortedDictionary, setting the Item property overwrites the old value. In contrast, the Add method throws an exception if an element with the specified key already exists.

A key cannot be a null reference (Nothing in Visual Basic), but a value can be, if the value type TValue is a reference type.

This method is an O(log n) operation, where n is Count.

The following code example creates an empty SortedDictionary of strings with string keys and uses the Add method to add some elements. The example demonstrates that the Add method throws an ArgumentException when attempting to add a duplicate key.

This code example is part of a larger example provided for the SortedDictionary class.

// Create a new sorted dictionary of strings, with string
// keys.
SortedDictionary<string, string> openWith = 
    new SortedDictionary<string, string>();

// Add some elements to the dictionary. There are no 
// duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("rtf", "wordpad.exe");

// The Add method throws an exception if the new key is 
// already in the dictionary.
try
{
    openWith.Add("txt", "winword.exe");
}
catch (ArgumentException)
{
    Console.WriteLine("An element with Key = \"txt\" already exists.");
}

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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