XPathBinder.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / XPathBinder.cs / 1305376 / 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.Xml;
    using System.Xml.XPath; 
 

    ///  
    /// 
    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; 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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XPathBinder.cs source code in C# .NET

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