XObject.BaseUri Property
Definition
Important
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Gets the base URI for this XObject.
public:
property System::String ^ BaseUri { System::String ^ get(); };public string BaseUri { get; }member this.BaseUri : stringPublic ReadOnly Property BaseUri As StringProperty Value
A String that contains the base URI for this XObject.
Examples
The following example loads the base URI and line information as it loads the file. It then prints the base URI and the line information.
This example uses the following XML document: Sample XML File: Typical Purchase Order (LINQ to XML).
XElement po = XElement.Load("PurchaseOrder.xml",
LoadOptions.SetBaseUri | LoadOptions.SetLineInfo);
string[] splitUri = po.BaseUri.Split('/');
Console.WriteLine("BaseUri: {0}", splitUri[splitUri.Length - 1]);
Console.WriteLine();
Console.WriteLine("{0}{1}{2}",
"Element Name".PadRight(20),
"Line".PadRight(5),
"Position");
Console.WriteLine("{0}{1}{2}",
"------------".PadRight(20),
"----".PadRight(5),
"--------");
foreach (XElement e in po.DescendantsAndSelf())
Console.WriteLine("{0}{1}{2}",
("".PadRight(e.Ancestors().Count() * 2) + e.Name).PadRight(20),
((IXmlLineInfo)e).LineNumber.ToString().PadRight(5),
((IXmlLineInfo)e).LinePosition);
Dim po As XElement = XElement.Load("PurchaseOrder.xml", LoadOptions.SetBaseUri Or LoadOptions.SetLineInfo)
Dim splitUri() As String = po.BaseUri.Split("/"c)
Console.WriteLine("BaseUri: {0}", splitUri(splitUri.Length - 1))
Console.WriteLine()
Console.WriteLine("{0}{1}{2}", _
"Element Name".PadRight(20), _
"Line".PadRight(5), _
"Position")
Console.WriteLine("{0}{1}{2}", _
"------------".PadRight(20), _
"----".PadRight(5), _
"--------")
For Each e As XElement In po.DescendantsAndSelf()
Console.WriteLine("{0}{1}{2}", _
("".PadRight(e.Ancestors().Count() * 2) & e.Name.ToString).PadRight(20), _
DirectCast(e, IXmlLineInfo).LineNumber.ToString().PadRight(5), _
DirectCast(e, IXmlLineInfo).LinePosition)
Next
This example produces the following output:
BaseUri: PurchaseOrder.xml
Element Name Line Position
------------ ---- --------
PurchaseOrder 2 2
Address 3 4
Name 4 6
Street 5 6
City 6 6
State 7 6
Zip 8 6
Country 9 6
Address 11 4
Name 12 6
Street 13 6
City 14 6
State 15 6
Zip 16 6
Country 17 6
DeliveryNotes 19 4
Items 20 4
Item 21 6
ProductName 22 8
Quantity 23 8
USPrice 24 8
Comment 25 8
Item 27 6
ProductName 28 8
Quantity 29 8
USPrice 30 8
ShipDate 31 8
Remarks
Using LINQ to XML, you can deserialize XML in a number of fashions. You can parse it from a string, load it from a file, or read it from a TextReader or an XmlReader. In all of these cases, LINQ to XML uses one or another of the concrete subclasses of XmlReader.
Sometimes the XmlReader has the base URI, and sometimes it does not. For instance, when loading from a file, the XmlReader knows the base URI, but when reading from an XmlReader that was created because of calling the Parse method, there is no possibility of the XmlReader reporting a base URI; the XML was in a string.
If, when parsing or loading the XML, you specify SetBaseUri, LINQ to XML will request the base URI for each node as the XmlReader returns the node. If the reader has the base URI, LINQ to XML will save the information with the LINQ to XML node. This property returns that information. If the underlying XmlReader does not have the base URI, then this property will return an empty string.
Setting SetBaseUri when loading an XML tree will result in slower parsing.
When setting the base URI for an XML tree, LINQ to XML puts an annotation on the root of the tree. This property is a computed property, and navigates up the tree to find the base URI.
