XDocument class
https://docs.microsoft.com/zh-cn/dotnet/api/system.xml.linq.xdocument?view=netframework-4.8
Represents an XML document.
The following example creates a document, and then adds a comment and an element to it. Then, it uses the query results to write another document.
Dim srcTree As XDocument = _
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!--This is a comment-->
<Root>
<Child1>data1</Child1>
<Child2>data2</Child2>
<Child3>data3</Child3>
<Child2>data4</Child2>
<Info5>info5</Info5>
<Info6>info6</Info6>
<Info7>info7</Info7>
<Info8>info8</Info8>
</Root>
Dim doc As XDocument = _
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!--This is a comment-->
<Root>
<%= From el In srcTree.<Root>.Elements _
Where CStr(el).StartsWith("data") _
Select el %>
</Root>
Console.WriteLine(doc)
This example produces the following output:
<!--This is a comment-->
<Root>
<Child1>data1</Child1>
<Child2>data2</Child2>
<Child3>data3</Child3>
<Child2>data4</Child2>
</Root>
XDocument replaces the XmlDocument object before the introduction of LINQ. The XDocument object is easier to use when dealing with XML documents, although it does not follow any international standards. It uses other new objects in this namespace, such as XNamespace, XComment, XElement, and XAttribute objects.
Constructor
| XDocument() | Initialize a new instance of the XDocument class. |
| XDocument(Object[]) | Initialize a new instance of the XDocument class with the specified content . |
| XDocument(XDeclaration, Object[]) | Initialize a new instance of the XDeclaration class with the specified XDocument and content . |
| XDocument(XDocument) | Initialize a new instance of the XDocument class from the existing XDocument object . |
method
| Load(Stream) | Create a new XDocument instance using the specified stream . |
| Load(Stream, LoadOptions) | Use the specified stream to create a new XDocument instance, you can also choose to leave blank, set the base URI and retain the line information. |
| Load(String) | Create a new XDocument from the file . |
| Load(String, LoadOptions) | To create a new XDocument from a file , you can also choose to keep blank and line information and set the base URI. |
| Load(TextReader) | Create a new TextReader from XDocument . |
| Load(TextReader, LoadOptions) | Create a new TextReader from XDocument , you can also choose to keep blank and line information and set the base URI. |
| Load(XmlReader) | |
| Load(XmlReader, LoadOptions) | Load XmlReader from XDocument , you can also choose to set the base URI and retain the line information. |
| Save(Stream) | |
| Save(Stream, SaveOptions) | Output this XDocument to the specified Stream , (optional) and specify the formatting behavior. |
| Save(String) | Serialize this XDocument to a file, if the file exists, overwrite the existing file. |
| Save(String, SaveOptions) | Serialize this XDocument into a file, and optionally disable formatting. |
| Save(TextWriter) | Serialize this XDocument to TextWriter . |
| Save(TextWriter, SaveOptions) | Serialize this XDocument to TextWriter , and optionally disable formatting. |
| Save(XmlWriter) | Serialize this XDocument to XmlWriter . |
Load method example:
Dim xdoc A$ XDocument = XDocument.Load .("C:\Hamlet.xml")
Console .WriteLine (xdoc.Root.Name .ToString ())
Console .WriteLine (xdoc ..Root .HasAttributes .ToString ())
Save方法示例：
Dim xdoc As XDocument = XDocument.Load("C:\Hamlet.xml")
xdoc.Save ( "c : \CopyOfHamlet . xml")
An example:
Module Module1
Sub Main()
testXdocument()
End Sub
Private Sub testXdocument()
Dim xDoc As XDocument = XDocument.Load("~\test.xml")
Console.WriteLine(xDoc.Root.Name.ToString)
Console.WriteLine(xDoc.Root.HasElements.ToString)
xDoc.Save("~\testcopy.xml")
Console.Read()
End Sub
End Module
'附：text.xml内容
'<?xml version="1.0" encoding="utf-8" ?>
'<MovieOrderDump>
' <FilmOrderList>
' <multiFilmOrders>
' <FilmOrder filmID="101">
' <name>Grease</name>
' <quantity>lO</quantity>
' </FilmOrder>
' <FilmOrder filmID="102">
’ <quantity>11</quantity>
' </FilmOrder>
' <FilmOrder filmID="l03">
' <name>Star Vlars</name>
' <quantity>l2</quantity>
' </FilmOrder>
' </multiFilmOrders>
' </FilmOrderList>
'</MovieOrderDump>
