Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Configuration/System/Configuration/DefaultSection.cs

@@ -0,0 +1,61 @@
+//------------------------------------------------------------------------------
+// <copyright file="DefaultSection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration {
+    using System.Xml;
+
+    public sealed class DefaultSection : ConfigurationSection {
+        private static volatile ConfigurationPropertyCollection  s_properties;
+
+        string  _rawXml = string.Empty;
+        bool    _isModified;
+
+        private static ConfigurationPropertyCollection EnsureStaticPropertyBag() {
+            if (s_properties == null) {
+                ConfigurationPropertyCollection properties = new ConfigurationPropertyCollection();
+                s_properties = properties;
+            }
+
+            return s_properties;
+        }
+
+        public DefaultSection() {
+            EnsureStaticPropertyBag();
+        }
+
+        protected internal override ConfigurationPropertyCollection Properties {
+            get {
+                return EnsureStaticPropertyBag();
+            }
+        }
+
+        protected internal override bool IsModified() {
+            return _isModified;
+        }
+
+        protected internal override void ResetModified() {
+            _isModified = false;
+        }
+
+        protected internal override void Reset(ConfigurationElement parentSection) {
+            _rawXml = string.Empty;
+            _isModified = false;
+        }
+
+        protected internal override void DeserializeSection(XmlReader xmlReader) {
+            if (!xmlReader.Read() || xmlReader.NodeType != XmlNodeType.Element) {
+                throw new ConfigurationErrorsException(SR.GetString(SR.Config_base_expected_to_find_element), xmlReader);
+            }
+            _rawXml = xmlReader.ReadOuterXml();
+            _isModified = true;
+        }
+
+        protected internal override string SerializeSection(ConfigurationElement parentSection, string name, ConfigurationSaveMode saveMode) {
+            return _rawXml;
+        }
+    }
+}
+