Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Xml/System/Xml/XPath/Internal/XPathChildIterator.cs

@@ -0,0 +1,35 @@
+//------------------------------------------------------------------------------
+// <copyright file="XPathChildIterator.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace MS.Internal.Xml.XPath {
+    using System;
+    using System.Xml;
+    using System.Xml.XPath;
+    using System.Diagnostics;
+    using System.Globalization;
+
+    internal class XPathChildIterator: XPathAxisIterator {
+        public XPathChildIterator(XPathNavigator nav, XPathNodeType type) : base(nav, type, /*matchSelf:*/false) {}
+        public XPathChildIterator(XPathNavigator nav, string name, string namespaceURI) : base(nav, name, namespaceURI, /*matchSelf:*/false) {}
+        public XPathChildIterator(XPathChildIterator it) : base(it) {}
+
+        public override XPathNodeIterator Clone() {
+            return new XPathChildIterator(this);
+        }
+
+        public override bool MoveNext() {
+            while ((first) ? nav.MoveToFirstChild() : nav.MoveToNext()) {
+                first = false;
+                if (Matches) {
+                    position++;
+                    return true;
+                }
+            }
+            return false;
+        }
+    }    
+}