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XAttribute Constructor (XName, Object)

Initializes a new instance of the XAttribute class from the specified name and value.

Namespace:  System.Xml.Linq
Assembly:  System.Xml.Linq (in System.Xml.Linq.dll)

public XAttribute(
	XName name,
	Object value


Type: System.Xml.Linq.XName

The XName of the attribute.

Type: System.Object

An Object containing the value of the attribute.


The name or value parameter is null.

There is an implicit conversion from string to XName. Typical use of this constructor is to specify a string as the first parameter instead of creating a new XName, as follows:

XElement root = new XElement("Root",
    new XAttribute("AnAttributeName", "Content")

You can also use the addition operator overload with an XNamespace and a string to create an XName, as follows:

XNamespace aw = "";
XElement root = new XElement(aw + "Root",
    new XAttribute(aw + "AnAttributeName", "Content")

For more information, see Working with XML Namespaces.

These same approaches will work for Visual Basic, however XML literals provide a better approach for creating XML trees.

The value parameter can be a String, double, float, decimal, bool, DateTime, or TimeSpan. If the value is a DateTime or TimeSpan, the value of the attribute is formatted correctly per the W3C specifications.

The following example uses this constructor to create attributes. It passes strings as the first argument to the XAttribute constructor, which are then implicitly converted to XName objects. The attributes are added to an element.

XElement root;

double dbl = 12.345;
XAttribute[] attArray = {
    new XAttribute("Att4", 1),
    new XAttribute("Att5", 2),
    new XAttribute("Att6", 3)
DateTime dt = new DateTime(2006, 10, 6, 12, 30, 00);

// string content
root = new XElement("Root",
    new XAttribute("Att1", "Some text"),

    // double content
    new XAttribute("Att2", dbl),

    // DateTime content
    new XAttribute("Att3", dt),

    // XAttribute array content


This example produces the following output:

<Root Att1="Some text" Att2="12.345" Att3="2006-10-06T12:30:00" Att4="1" Att5="2" Att6="3" />

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, 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

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0