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 Sub New (
	name As XName,
	value As Object
)

Parameters

name
Type: System.Xml.Linq.XName

The XName of the attribute.

value
Type: System.Object

An Object containing the value of the attribute.

Exception Condition
ArgumentNullException

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 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.


                Dim dbl As Double = 12.345
Dim attArray As XAttribute() = { _
    New XAttribute("Att4", 1), _
    New XAttribute("Att5", 2), _
    New XAttribute("Att6", 3) _
}
Dim dt As DateTime = New DateTime(2006, 10, 6, 12, 30, 0)
Dim root As XElement = <Root Att1="Some text"
                           Att2=<%= dbl %>
                           Att3=<%= dt %>
                           <%= attArray %>
                       />
Console.WriteLine(root)

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" />

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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