Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Xml/System/Xml/Dom/XmlChildNodes.cs

@@ -0,0 +1,47 @@
+//------------------------------------------------------------------------------
+// <copyright file="XmlChildNodes.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+namespace System.Xml {
+    using System.Collections;
+
+    internal class XmlChildNodes: XmlNodeList {
+        private XmlNode container;
+
+        public XmlChildNodes( XmlNode container ) {
+            this.container = container;
+        }
+
+        public override XmlNode Item( int i ) {
+            // Out of range indexes return a null XmlNode
+            if (i < 0)
+                return null;
+            for (XmlNode n = container.FirstChild; n != null; n = n.NextSibling, i--) {
+                if (i == 0)
+                    return n;
+            }
+            return null;
+        }
+
+        public override int Count {
+            get {
+                int c = 0;
+                for (XmlNode n = container.FirstChild; n != null; n = n.NextSibling) {
+                    c++;
+                }
+                return c;
+            }
+        }
+
+        public override IEnumerator GetEnumerator() {
+            if ( container.FirstChild == null ) {
+                return XmlDocument.EmptyEnumerator;
+            }
+            else {
+                return new XmlChildEnumerator( container );
+            }
+        }
+    }
+}