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Construction

LINQ To XML Samples - Construction

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Construct an XElement from string

Construct an XElement from literal

Public Sub XLinq6()
    Dim xml = _
        <purchaseOrder price="100">
            <item price="50">Motor</item>
            <item price="50">Cable</item>
        </purchaseOrder>

    Console.WriteLine(xml)
End Sub

Result:
<purchaseOrder price="100">
  <item price="50">Motor</item>
  <item price="50">Cable</item>
</purchaseOrder>

Add XML declaration to a document

Add XML declaration to a document

Public Sub XLinq7()
    Dim doc = <?xml version="1.0" encoding="UTF-16" standalone="yes"?><foo/>

    Dim sw = New StringWriter()
    doc.Save(sw)
    Console.WriteLine(sw)
End Sub

Result:
<?xml version="1.0" encoding="utf-16" standalone="yes"?>
<foo />

Computed element name

Computed element name

Public Sub XLinq8()
    Dim customers = XDocument.Load(dataPath + "nw_customers.xml")
    Dim name As String = customers.<Root>.<Customers>.@CustomerID
    Dim result As XElement = <<%= name %>>Element with a computed name</>
    Console.WriteLine(result)
End Sub

Result:
<ALFKI>Element with a computed name</ALFKI>

Document creation

Create a simple config file

Public Sub XLinq9()
    Dim myDocument = <?xml version="1.0"?>
                     <configuration>
                         <system.web>
                             <membership>
                                 <providers>
                                     <add name="WebAdminMembershipProvider" type="System.Web.Administration.WebAdminMembershipProvider"/>
                                 </providers>
                             </membership>
                             <httpModules>
                                 <add name="WebAdminModule" type="System.Web.Administration.WebAdminModule"/>
                             </httpModules>
                             <authentication mode="Windows"/>
                             <authorization>
                                 <deny users="?"/>
                             </authorization>
                             <identity impersonate="true"/>
                             <trust level="full"/>
                             <pages validationRequest="true"/>
                         </system.web>
                     </configuration>

    Console.WriteLine(myDocument)
End Sub

Result:
<configuration>
  <system.web>
    <membership>
      <providers>
        <add name="WebAdminMembershipProvider" type="System.Web.Administration.WebAdminMembershipProvider" />
      </providers>
    </membership>
    <httpModules>
      <add name="WebAdminModule" type="System.Web.Administration.WebAdminModule" />
    </httpModules>
    <authentication mode="Windows" />
    <authorization>
      <deny users="?" />
    </authorization>
    <identity impersonate="true" />
    <trust level="full" />
    <pages validationRequest="true" />
  </system.web>
</configuration>

Create an XmlSchema

Create an XmlSchema

Public Sub XLinq10()
    Dim result = _
    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
        xmlns:sql="urn:schemas-microsoft-com:mapping-schema">

        <xsd:element name="root" sql:is-constant="1">
            <xsd:complexType>
                <xsd:sequence>
                    <xsd:element name="Customers" minOccurs="100" maxOccurs="unbounded">
                        <xsd:complexType>
                            <xsd:sequence>
                                <xsd:element name="CompanyName" type="xsd:string"/>
                                <xsd:element name="ContactName" type="xsd:string"/>
                                <xsd:element name="ContactTitle" type="xsd:string"/>
                                <xsd:element name="Phone" type="xsd:string"/>
                                <xsd:element name="Fax" type="xsd:string"/>
                                <xsd:element ref="FullAddress" maxOccurs="3"/>
                                <xsd:element name="Date" type="xsd:date"/>
                            </xsd:sequence>
                            <xsd:attribute name="CustomerID" type="xsd:integer"/>
                        </xsd:complexType>
                    </xsd:element>
                </xsd:sequence>
            </xsd:complexType>
        </xsd:element>
        <xsd:element name="FullAddress" sql:relation="Customers" sql:relationship="CustAdd" sql:key-fields="CustomerID">
            <xsd:complexType>
                <xsd:sequence>
                    <xsd:element name="Address" type="xsd:string"/>
                    <xsd:element name="City" type="xsd:string"/>
                    <xsd:element name="Region" type="xsd:string"/>
                    <xsd:element name="PostalCode" type="xsd:string"/>
                    <xsd:element name="Country" type="xsd:string"/>
                </xsd:sequence>
            </xsd:complexType>
        </xsd:element>
    </xsd:schema>
    Console.WriteLine(result)
End Sub

Result:<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema">
  <xsd:element name="root" sql:is-constant="1">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="Customers" minOccurs="100" maxOccurs="unbounded">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="CompanyName" type="xsd:string" />
              <xsd:element name="ContactName" type="xsd:string" />
              <xsd:element name="ContactTitle" type="xsd:string" />
              <xsd:element name="Phone" type="xsd:string" />
              <xsd:element name="Fax" type="xsd:string" />
              <xsd:element ref="FullAddress" maxOccurs="3" />
              <xsd:element name="Date" type="xsd:date" />
            </xsd:sequence>
            <xsd:attribute name="CustomerID" type="xsd:integer" />
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
  <xsd:element name="FullAddress" sql:relation="Customers" sql:relationship="CustAdd" sql:key-fields="CustomerID">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="Address" type="xsd:string" />
        <xsd:element name="City" type="xsd:string" />
        <xsd:element name="Region" type="xsd:string" />
        <xsd:element name="PostalCode" type="xsd:string" />
        <xsd:element name="Country" type="xsd:string" />
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

Construct a PI

Create an XML document with an XSLT PI

Public Sub XLinq11()
    Dim result = <?xml version="1.0"?>
                 <?xml-stylesheet type='text/xsl' href='diff.xsl'?>
                 <foo/>

    Console.WriteLine(result)
End Sub

Result:
<?xml-stylesheet type='text/xsl' href='diff.xsl'?>
<foo />

XML comment construction

XML comment construction

Public Sub XLinq12()
    Dim result = <?xml version="1.0"?>
                 <!--My phone book-->
                 <phoneBook>
                     <!--My friends-->
                     <Contact name="Ralph">
                         <homephone>425-234-4567</homephone>
                         <cellphone>206-345-75656</cellphone>
                     </Contact>
                     <Contact name="Dave">
                         <homephone>516-756-9454</homephone>
                         <cellphone>516-762-1546</cellphone>
                     </Contact>
                     <!--My family-->
                     <Contact name="Julia">
                         <homephone>425-578-1053</homephone>
                         <cellphone></cellphone>
                     </Contact>
                     <!--My team-->
                     <Contact name="Robert">
                         <homephone>345-565-1653</homephone>
                         <cellphone>321-456-2567</cellphone>
                     </Contact>
                 </phoneBook>


    Console.WriteLine(result)
End Sub

Result:
<!--My phone book-->
<phoneBook>
  <!--My friends-->
  <Contact name="Ralph">
    <homephone>425-234-4567</homephone>
    <cellphone>206-345-75656</cellphone>
  </Contact>
  <Contact name="Dave">
    <homephone>516-756-9454</homephone>
    <cellphone>516-762-1546</cellphone>
  </Contact>
  <!--My family-->
  <Contact name="Julia">
    <homephone>425-578-1053</homephone>
    <cellphone></cellphone>
  </Contact>
  <!--My team-->
  <Contact name="Robert">
    <homephone>345-565-1653</homephone>
    <cellphone>321-456-2567</cellphone>
  </Contact>
</phoneBook>

Create a CData section

Create a CData section

Public Sub XLinq13()
    Dim e = <Dump><![CDATA[<dump>this is some xml</dump>]]>some other text</Dump>
    Console.WriteLine("Element Value: " & e.Value)
    Console.WriteLine("Text nodes collapsed!: " & e.Nodes(0).ToString)
    Console.WriteLine("CData preserved on serialization: " & e.ToString)
End Sub

Result:
Element Value: <dump>this is some xml</dump>some other text
Text nodes collapsed!: <![CDATA[<dump>this is some xml</dump>]]>
CData preserved on serialization: <Dump><![CDATA[<dump>this is some xml</dump>]]>some other text</Dump>

Create a sequence of nodes

Create a sequence of customer elements

Public Sub XLinq14()

    Dim cSequence = <?xml version="1.0"?>
                    <root>
                        <customer id="x">new customer</customer>
                        <customer id="y">new customer</customer>
                        <customer id="z">new customer</customer>
                    </root>

    For Each c In From cust In cSequence.<root>.<customer>
        Console.WriteLine(c)
    Next
End Sub

Result:
<customer id="x">new customer</customer>
<customer id="y">new customer</customer>
<customer id="z">new customer</customer>