Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/SMDiagnostics/System/ServiceModel/Diagnostics/MachineSettingsSection.cs

@@ -0,0 +1,58 @@
+//------------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------------------------
+
+#if !NO_CONFIGURATION
+namespace System.ServiceModel.Configuration
+{
+    using System.Configuration;
+
+    internal class MachineSettingsSection : ConfigurationSection
+    {
+        static bool enableLoggingKnownPii;
+        static bool hasInitialized = false;
+        static object syncRoot = new object();
+
+        const string enableLoggingKnownPiiKey = "enableLoggingKnownPii";
+        ConfigurationPropertyCollection properties;
+
+        protected override ConfigurationPropertyCollection Properties
+        {
+            get
+            {
+                if (this.properties == null)
+                {
+                    ConfigurationPropertyCollection properties = new ConfigurationPropertyCollection();
+                    properties.Add(new ConfigurationProperty(MachineSettingsSection.enableLoggingKnownPiiKey, typeof(System.Boolean), false, null, null, System.Configuration.ConfigurationPropertyOptions.None));
+                    this.properties = properties;
+                }
+                return this.properties;
+            }
+        }
+
+        public static bool EnableLoggingKnownPii
+        {
+            get
+            {
+                if (!hasInitialized)
+                {
+                    lock (syncRoot)
+                    {
+                        if (!hasInitialized)
+                        {
+                            MachineSettingsSection machineSettingsSection = (MachineSettingsSection)ConfigurationManager.GetSection("system.serviceModel/machineSettings");
+                            enableLoggingKnownPii = (bool)machineSettingsSection[MachineSettingsSection.enableLoggingKnownPiiKey];
+                            hasInitialized = true;
+                        }
+                    }
+                }
+
+                return enableLoggingKnownPii;
+            }
+        }
+    }
+}
+#endif
+
+
+