XPathBinder.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / 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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