//Вычисление выражений с помощью XPath
static void Main(string[] args)
{
double sum = 0;
//Создание XPath документа:
XPathDocument xPathDocument = new XPathDocument("books.xml");
XPathNavigator xPathNavigator = xPathDocument.CreateNavigator();
//Вычисляющий запрос с дополнительной компиляцией.
XPathExpression xPathExpression = xPathNavigator.Compile("sum(ListOfBooks/Book/Price/text())");
Console.WriteLine(xPathExpression.ReturnType);
if (xPathExpression.ReturnType == XPathResultType.Number)
{
sum = (double)xPathNavigator.Evaluate(xPathExpression);
Console.WriteLine(sum);
}
//Вычисляющий запрос без предварительной компиляции.
//Кроме выборки производится арифметическое вычисление.
sum = (double)xPathNavigator.Evaluate("sum(//Price/text())*10");
Console.WriteLine(sum);
XPathNodeIterator elements = (XPathNodeIterator)xPathNavigator.Evaluate("//Title[@FontSize='10']");
var enumaretor = elements.GetEnumerator();
while (enumaretor.MoveNext())
{
Console.WriteLine((enumaretor.Current as XPathNavigator).Value);
}
//Delay
Console.ReadKey();
}
// Token: 0x0600637A RID: 25466 RVA: 0x001BF9AC File Offset: 0x001BDBAC
private List <Guid> FindAnnotationIds(string queryExpression)
{
Invariant.Assert(queryExpression != null && queryExpression.Length > 0, "Invalid query expression");
List <Guid> list = null;
object syncRoot = base.SyncRoot;
lock (syncRoot)
{
this.CheckStatus();
XPathNavigator xpathNavigator = this._document.CreateNavigator();
XPathNodeIterator xpathNodeIterator = xpathNavigator.Select(queryExpression, this._namespaceManager);
if (xpathNodeIterator != null && xpathNodeIterator.Count > 0)
{
list = new List <Guid>(xpathNodeIterator.Count);
using (IEnumerator enumerator = xpathNodeIterator.GetEnumerator())
{
while (enumerator.MoveNext())
{
object obj = enumerator.Current;
XPathNavigator xpathNavigator2 = (XPathNavigator)obj;
string attribute = xpathNavigator2.GetAttribute("Id", "");
if (string.IsNullOrEmpty(attribute))
{
throw new XmlException(SR.Get("RequiredAttributeMissing", new object[]
{
"Id",
"Annotation"
}));
}
Guid item;
try
{
item = XmlConvert.ToGuid(attribute);
}
catch (FormatException innerException)
{
throw new InvalidOperationException(SR.Get("CannotParseId"), innerException);
}
list.Add(item);
}
return(list);
}
}
list = new List <Guid>(0);
}
return(list);
}
public ArrayList SelectElementsByXPath(string xpath)
{
if (shouldWait)
{
WaitForDocumentToComplete(HtmlDocument);
}
XPathNavigator navigator = CreateNavigator();
XPathNodeIterator nodes = navigator.Select(xpath);
IEnumerator allNodes = nodes.GetEnumerator();
ArrayList elements = new ArrayList();
while (allNodes.MoveNext())
{
NavigableDocument node = (NavigableDocument)allNodes.Current;
elements.Add(new WrappedWebElement(this, node.UnderlyingObject as IHTMLDOMNode));
}
return(elements);
}
