1 files changed, 59 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/AppContext/AppContextDefaultValues.Defaults.cs b/src/mscorlib/src/System/AppContext/AppContextDefaultValues.Defaults.cs
new file mode 100644
index 0000000000..11c3cdfbcf
--- /dev/null
+++ b/src/mscorlib/src/System/AppContext/AppContextDefaultValues.Defaults.cs
@@ -0,0 +1,59 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+namespace System
+{
+    internal static partial class AppContextDefaultValues
+    {
+
+        internal static readonly string SwitchNoAsyncCurrentCulture = "Switch.System.Globalization.NoAsyncCurrentCulture";
+        internal static readonly string SwitchThrowExceptionIfDisposedCancellationTokenSource = "Switch.System.Threading.ThrowExceptionIfDisposedCancellationTokenSource";
+
+        
+        // This is a partial method. Platforms can provide an implementation of it that will set override values
+        // from whatever mechanism is available on that platform. If no implementation is provided, the compiler is going to remove the calls
+        // to it from the code
+        // We are going to have an implementation of this method for the Desktop platform that will read the overrides from app.config, registry and
+        // the shim database. Additional implementation can be provided for other platforms.
+        static partial void PopulateOverrideValuesPartial();
+
+        static partial void PopulateDefaultValuesPartial(string platformIdentifier, string profile, int version)
+        {
+            // When defining a new switch  you should add it to the last known version.
+            // For instance, if you are adding a switch in .NET 4.6 (the release after 4.5.2) you should defined your switch
+            // like this:
+            //    if (version <= 40502) ...
+            // This ensures that all previous versions of that platform (up-to 4.5.2) will get the old behavior by default
+            // NOTE: When adding a default value for a switch please make sure that the default value is added to ALL of the existing platforms!
+            // NOTE: When adding a new if statement for the version please ensure that ALL previous switches are enabled (ie. don't use else if)
+            switch (platformIdentifier)
+            {
+                case ".NETCore":
+                case ".NETFramework":
+                    {
+                        if (version <= 40502)
+                        {
+                            AppContext.DefineSwitchDefault(SwitchNoAsyncCurrentCulture, true);
+                            AppContext.DefineSwitchDefault(SwitchThrowExceptionIfDisposedCancellationTokenSource, true);
+                        }
+                        break;
+                    }
+                case "WindowsPhone":
+                case "WindowsPhoneApp":
+                    {
+                        if (version <= 80100)
+                        {
+                            AppContext.DefineSwitchDefault(SwitchNoAsyncCurrentCulture, true);
+                            AppContext.DefineSwitchDefault(SwitchThrowExceptionIfDisposedCancellationTokenSource, true);
+                        }
+                        break;
+                    }
+            }
+
+            // At this point we should read the overrides if any are defined
+            PopulateOverrideValuesPartial();
+        }
+    }
+}