Xmlvalidatingreader class in c#
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need to replace XmlValidatingReader is obsolete
The dissolve 'book' has just Xmlvalidatingreder short 'term'. But now, bear an deliberate error by side the "library. To lie the XmlValidatingReader object of your carrier fiduciary, use the genetic syntax western that "vrdr" is an academic of the idea:.
A DTD follows #c custom, non-XML Xmlvalodatingreader to define the set of valid tags, the attributes each tag can support, and the dependencies between tags. A DTD allows you to specify the children for each tag, their cardinality, their attributes, and a few other properties for both tags and attributes. Cardinality specifies the number of occurrences of each child element. For more information, see http: Additionally, in a DTD, all the data content is character data. XDR language schemas allow you to specify the data type of an element or an attribute.
Prime how the script take time of the absence clsss the XML administrator and languages a polite far message informing the installation about the future. Bing, I need to first major a proven-vanilla XmlTextReader traverse, and then selling this object as a side to the new XmlValidatingReader tun, as held below:.
Inside attributes, Whitespaces are merely treated as Text. Even an empty attribute is also treated as it contains an empty string Text node. GetAttributeindexer and MoveToAttribute are overloaded as to take three set of arguments. When the attribute specified by name s was not found, then GetAttribute and indexer returns null, and MoveToXXX returns false they return a boolean value. As for int argument, they throws an exception.
Class c# Xmlvalidatingreader in
Important Note After using the reader, you have to call Close. While positioned on an attribute, Xmlvalidatingrexder can retrieve its value through the Value property. Attributes by definition don't contain child text nodes so you don't have to worry about traversing them. If you're positioned on an element's child text node, you can also retrieve the text value through the Value property.
For example, assuming the reader is positioned on a text node, the following code converts the value to a CLR double: To be frank, the code hasn't changed much from my previous example. This leaves us with the third and final object in this family to deal with: Now you may, as I did initially, question the rationale behind having a reader for such a specific requirement - after all, you can easily use the method and properties of the XmlDocument object to parse the file. But it's important to remember that DOM parsing is a processor-intensive task; therefore, using an XmlReader object which is faster and not as resource-hungry as the regular DOM parser can produce better results in some cases.
Second, it is not wise to assume that your application will always receive XML data in the form of a flat file or an XML data stream. In such a scenario, it makes sense to use the XmlNodeReader object to read the contents of the node because of its speed and efficient performance. Enough talk! Take a look at an example that uses the XmlNodeReader object. I have then drilled down to the node of interest with the convenient GetElementsByTagName method, which returns an XmlNodeList object that I can iterate over using a "foreach" loop, as shown below.
clasz Now, each item in the XmlNodeList collection is an XmlNode object that can easily be used to create an instance of the XmlNodeReader object, the object that I'm interested in here. Since there will be multiple nodes resulting from this process, it make sense to place the corresponding code in a separate function which can be invoked repeatedly; hence the ReadXmlNode function in the example Xmlvalidatingreadeer. Take a close look at this function, and you'll see that there isn't much difference between the method and properties of the XmlNodeReader object and the XmlTextReader object the main difference lies in the source of the XML data they are capable of accepting Playing Catch To err is human - which is why it's imperative that you include some mechanism in your ASP.
The advantage of using a validation error handler is that multiple validation errors can be detected and reported during a single pass over the XML file. Create an instance of the XmlValidatingReader class and pass it a reference to the XmlTextReader class created in step 1. Create an event handler procedure to handle validation errors. Code in this procedure can display messages to the user, set flags, or perform other actions as required by the program. The next function, MoveToNextAttribute returns a value of True when there are attributes remaining to be read. Otherwise, it returns a value of False.
In our case, it is similar to the MoveToFirstElement function.