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 = "http://www.adventure-works.com";
XElement root = new XElement(aw + "Root",
    new XAttribute(aw + "AnAttributeName", "Content")

For more information, see Working With 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.

    StringBuilder output = new StringBuilder();
    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

    output.Append(root + Environment.NewLine);

    OutputTextBlock.Text = output.ToString();


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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