Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

external/referencesource/mscorlib/system/AppContext/AppContextDefaultValues.Defaults.Central.cs

@@ -0,0 +1,34 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+
+//
+// This file is used to provide an implementation for defining a default value
+// This should be compiled only in mscorlib where the AppContext class is available
+//
+
+namespace System
+{
+    internal static partial class AppContextDefaultValues
+    {
+        /// <summary>
+        /// This method allows reading the override for a switch. 
+        /// The implementation is platform specific
+        /// </summary>
+        public static bool TryGetSwitchOverride(string switchName, out bool overrideValue)
+        {
+            // The default value for a switch is 'false'
+            overrideValue = false;
+
+            // Read the override value
+            bool overrideFound = false;
+
+            // This partial method will be removed if there are no implementations of it.
+            TryGetSwitchOverridePartial(switchName, ref overrideFound, ref overrideValue);
+
+            return overrideFound;
+        }
+    }
+}