Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,56 @@
+//------------------------------------------------------------------------------
+// <copyright file="KeyValueInternalCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration {
+    using System;
+    using System.Xml;
+    using System.Configuration;
+    using System.Collections.Specialized;
+    using System.Collections;
+    using System.IO;
+    using System.Text;
+
+    // class AppSettingsSection
+
+    class KeyValueInternalCollection : NameValueCollection {
+        private AppSettingsSection _root = null;
+        public KeyValueInternalCollection(AppSettingsSection root) {
+            _root = root;
+            foreach (KeyValueConfigurationElement element in _root.Settings) {
+                base.Add(element.Key, element.Value);
+            }
+        }
+
+        public override void Add(String key, String value) {
+            _root.Settings.Add(new KeyValueConfigurationElement(key, value));
+            base.Add(key, value);
+        }
+
+        public override void Clear() {
+            _root.Settings.Clear();
+            base.Clear();
+        }
+
+        public override void Remove(string key) {
+            _root.Settings.Remove(key);
+            base.Remove(key);
+        }
+
+#if DONT_COMPILE
+        // Unfortunately this is not virtual and we hand out the base collection
+        public new string this[string key] {
+            get {
+                return base[key];
+            }
+            set {
+                _root.Settings[key] = new KeyValueConfigurationElement(key, value);
+                base[key] = value;
+            }
+        }
+#endif
+
+    }
+}