Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Xml/System/Xml/XPath/Internal/EmptyQuery.cs

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+//------------------------------------------------------------------------------
+// <copyright file="EmptyQuery.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;
+    using System.Xml.Xsl;
+    using System.Collections;
+
+    internal sealed class EmptyQuery : Query {
+        public override XPathNavigator Advance() { return null; }
+        public override XPathNodeIterator Clone() { return this; }
+        public override object Evaluate(XPathNodeIterator context) { return this; }
+        public override int CurrentPosition { get { return 0; } }
+        public override int Count { get { return 0; } }
+        public override QueryProps Properties { get { return QueryProps.Merge | QueryProps.Cached | QueryProps.Position | QueryProps.Count; } }
+        public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } }
+        public override void Reset() { }
+        public override XPathNavigator Current { get { return null; } }
+    }
+}