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

stops the loading. Otherwise, the operation continues unless the handler itself throwsan exception.Loading from a StringThe XML DOM programming interface also provides you with a method to build a DOMfrom a well-formed XML string. The method is LoadXml and is shown here:public virtual void LoadXml(string xml);This method neither supports validation nor preserves white spaces. Any contextspecificinformation you might need (DTD, entities, namespaces) must necessarily beembedded in the string to be taken into account.Loading Documents AsynchronouslyThe .NET Framework implementation of the XML DOM does not provide forasynchronous loading. The Load method, in fact, always work synchronously and doesnot pass the control back to the caller until completed. As you might guess, this canbecome a serious problem when you have huge files to process and a rich userinterface.In similar situations—that is, when you are writing a Windows Forms rich client—usingthreads can be the most effective solution. You transfer to a worker thread the burdenof loading the XML document and update the user interface when the thread returns, asshown here:void StartDocumentLoading(){// Create the worker threadThread t = new Thread(newThreadStart(this.LoadXmlDocument));}statusBar.Text = "Loading document...";t.Start();void LoadXmlDocument(){XmlDocument doc = new XmlDocument();doc.Load(InputFile.Text);// Update the user interfacestatusBar.Text = "Document loaded.";Output.Text = doc.OuterXml;Output.ReadOnly = false;}return;185