Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / XPathBinder.cs / 1 / XPathBinder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.Globalization; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Data; using System.Security.Permissions; using System.Xml; using System.Xml.XPath; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class XPathBinder { ///private XPathBinder() { } /// /// public static object Eval(object container, string xPath) { IXmlNamespaceResolver resolver = null; return Eval(container, xPath, resolver); } public static object Eval(object container, string xPath, IXmlNamespaceResolver resolver) { if (container == null) { throw new ArgumentNullException("container"); } if (String.IsNullOrEmpty(xPath)) { throw new ArgumentNullException("xPath"); } IXPathNavigable node = container as IXPathNavigable; if (node == null) { throw new ArgumentException(SR.GetString(SR.XPathBinder_MustBeIXPathNavigable, container.GetType().FullName)); } XPathNavigator navigator = node.CreateNavigator(); object retValue = navigator.Evaluate(xPath, resolver); // If we get back an XPathNodeIterator instead of a simple object, advance // the iterator to the first node and return the value. XPathNodeIterator iterator = retValue as XPathNodeIterator; if (iterator != null) { if (iterator.MoveNext()) { retValue = iterator.Current.Value; } else { retValue = null; } } return retValue; } ////// public static string Eval(object container, string xPath, string format) { return Eval(container, xPath, format, null); } public static string Eval(object container, string xPath, string format, IXmlNamespaceResolver resolver) { object value = XPathBinder.Eval(container, xPath, resolver); if (value == null) { return String.Empty; } else { if (String.IsNullOrEmpty(format)) { return value.ToString(); } else { return String.Format(format, value); } } } ////// Evaluates an XPath query with respect to a context IXPathNavigable object that returns a NodeSet. /// public static IEnumerable Select(object container, string xPath) { return Select(container, xPath, null); } public static IEnumerable Select(object container, string xPath, IXmlNamespaceResolver resolver) { if (container == null) { throw new ArgumentNullException("container"); } if (String.IsNullOrEmpty(xPath)) { throw new ArgumentNullException("xPath"); } ArrayList results = new ArrayList(); IXPathNavigable node = container as IXPathNavigable; if (node == null) { throw new ArgumentException(SR.GetString(SR.XPathBinder_MustBeIXPathNavigable, container.GetType().FullName)); } XPathNavigator navigator = node.CreateNavigator(); XPathNodeIterator iterator = navigator.Select(xPath, resolver); while (iterator.MoveNext()) { IHasXmlNode hasXmlNode = iterator.Current as IHasXmlNode; if (hasXmlNode == null) { throw new InvalidOperationException(SR.GetString(SR.XPathBinder_MustHaveXmlNodes)); } results.Add(hasXmlNode.GetNode()); } return results; } } }
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