XDocumentType.SystemId Egenskap

public:
 property System::String ^ SystemId { System::String ^ get(); void set(System::String ^ value); };

public string SystemId { get; set; }

public string? SystemId { get; set; }

member this.SystemId : string with get, set

Public Property SystemId As String

Egenskapsvärde

En String som innehåller systemidentifieraren för den här dokumenttypsdefinitionen (DTD).

Exempel

I följande exempel skapas ett XML-dokument som refererar till en extern privat DTD. DTD:en har ingen intern delmängd. Anropet XDocumentType till konstruktorn återspeglar användningen av den externa privata DTD:en. Den skickas null för den interna delmängden.

string pubsDtd =
@"<!ELEMENT Pubs (Book+)>
<!ELEMENT Book (Title, Author)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Author (#PCDATA)>";
File.WriteAllText("Pubs.dtd", pubsDtd);

string target = "xml-stylesheet";
string data = "href=\"mystyle.css\" title=\"Compact\" type=\"text/css\"";

XDocument doc = new XDocument(
    new XDocumentType("Pubs", null, "Pubs.dtd", null),
    new XElement("Pubs",
        new XElement("Book",
            new XElement("Title", "Artifacts of Roman Civilization"),
            new XElement("Author", "Moreno, Jordao")
        ),
        new XElement("Book",
            new XElement("Title", "Midieval Tools and Implements"),
            new XElement("Author", "Gazit, Inbar")
        )
    ),
    new XComment("This is another comment.")
);
doc.Declaration = new XDeclaration("1.0", "utf-8", "true");
doc.Save("Pubs.xml");

// Validate Pubs.xml against Pubs.dtd.
XmlReaderSettings xrs = new XmlReaderSettings();
xrs.ProhibitDtd = false;
xrs.ValidationType = ValidationType.DTD;
xrs.ConformanceLevel = ConformanceLevel.Auto;
XmlReader xr = XmlReader.Create("Pubs.xml", xrs);
XDocument doc2 = XDocument.Load(xr);

XDocumentType dt = doc2.Document.DocumentType;
Console.WriteLine("SystemId:{0}", dt.SystemId);

Dim pubsDtd As String = _
    "<!ELEMENT Pubs (Book+)>" & Environment.NewLine & _
    "<!ELEMENT Book (Title, Author)>" & Environment.NewLine & _
    "<!ELEMENT Title (#PCDATA)>" & Environment.NewLine & _
    "<!ELEMENT Author (#PCDATA)>"
File.WriteAllText("Pubs.dtd", pubsDtd)

Dim target As String = "xml-stylesheet"
Dim data As String = "href='mystyle.css' title='Compact' type='text/css'"

Dim doc As XDocument = _
    <?xml version='1.0'?>
    <Pubs>
        <Book>
            <Title>Artifacts of Roman Civilization</Title>
            <Author>Moreno, Jordao</Author>
        </Book>
        <Book>
            <Title>Midieval Tools and Implements</Title>
            <Author>Gazit, Inbar</Author>
        </Book>
    </Pubs>
    <!--This is another comment.-->

doc _
.FirstNode _
.AddBeforeSelf(New XDocumentType("Pubs", Nothing, "Pubs.dtd", Nothing))

doc.Declaration = New XDeclaration("1.0", "utf-8", "true")
doc.Save("Pubs.xml")

' Validate Pubs.xml against Pubs.dtd.
Dim xrs As XmlReaderSettings = New XmlReaderSettings()
xrs.ProhibitDtd = False
xrs.ValidationType = ValidationType.DTD
xrs.ConformanceLevel = ConformanceLevel.Auto
Dim xr As XmlReader = XmlReader.Create("Pubs.xml", xrs)
Dim doc2 As XDocument = XDocument.Load(xr)

Dim dt As XDocumentType = doc2.Document.DocumentType
Console.WriteLine("SystemId:{0}", dt.SystemId)

Det här exemplet genererar följande utdata:

SystemId:Pubs.dtd

Kommentarer

Om ett XML-dokument använder en extern privat DTD innehåller den här egenskapen den privata identifieraren för den externa DTD:en.

Se även

• Översikt över LINQ till XML