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NameValueCollection.Item Property (String)

Gets or sets the entry with the specified key in the NameValueCollection.

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

public string this[
	string name
] { get; set; }

Parameters

name
Type: System.String

The String key of the entry to locate. The key can be null.

Property Value

Type: System.String
A String that contains the comma-separated list of values associated with the specified key, if found; otherwise, null.

ExceptionCondition
NotSupportedException

The collection is read-only and the operation attempts to modify the collection.

This property provides the ability to access a specific element in the collection by using the following syntax: myCollection[name].

If the specified key already exists in the collection, setting this property overwrites the existing list of values with the specified value. To append the new value to the existing list of values, use the Add method.

If the specified key does not exist in the collection, setting this property creates a new entry using the specified key and the specified value.

Caution noteCaution:

This property returns null in the following cases: 1) if the specified key is not found; and 2) if the specified key is found and its associated value is null. This property does not distinguish between the two cases.

The C# language uses the this 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 or setting the values associated with the specified key is an O(n) operation, where n is the number of values.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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