Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

Table 2-3: Public Methods of the XmlReader ClassMethodReadElementStringReadEndElementReadInnerXmlReadOuterXmlReadStartElementReadStringResolveEntitySkipDescriptionon page 41.)Reads and returns the text from a text-only element.Checks that the current content node is an end tagand advances the reader to the next node. Throwsan exception if the node is not an end tag.Reads and returns all the content below the currentnode, including markup information.Reads and returns all the content in and below thecurrent node, including markup information.Checks that the current node is an element andadvances the reader to the next node. Throws anexception if the node is not a start tag.Reads the contents of an element or a text node asa string. This method concatenates all the text upuntil the next markup. For attribute nodes, callingthis method is equivalent to reading the attributevalue.Expands and resolves the current EntityReferencenode.Skips the children of the current node.In addition to the methods listed in Table 2-3, the XmlReader class also features acouple of static (shared, if you speak only Microsoft Visual Basic) methods namedIsName and IsNameToken. Both take a string and return a Boolean value. The returnvalue indicates whether the given string complies with the respective definitions of aName and a Nmtoken (name token) according to the W3C XML 1.0 Recommendation.In XML 1.0, a Name is a string that begins with a letter, an underscore (_), or a colon (:)and continues with letters, digits, hyphens, underscores, and colons. A Nmtoken, on theother hand, is any non-zero-length mixture of name characters—that is, letters, digits,hyphens, underscores, and colons.NoteA static member (as opposed to an instance member) of a class is akind of global member that belongs to the type itself rather than to aspecific instance of the class. Whereas an instance of a class contains aseparate copy of all instance members, there is only one copy of eachstatic member. Static members can't be referenced through an instance.Instead, you must reference them through the type name:Console.WriteLine(XmlReader.IsName("DinoEsposito"));Members that in C# are called static and declared with the statickeyword, in Visual Basic .NET are called shared and are declared withthe Shared keyword. Aside from this, their usage is identical.Recognized Node TypesEach node in an XML source is of a certain type. The NodeType property is a read-onlyproperty that returns the type of the current node. The returned value belongs to theXmlNodeType enumeration, which comprises the node types listed in the Table 2-4.25