Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/Util/BinaryCompatibility.cs

@@ -0,0 +1,46 @@
+//------------------------------------------------------------------------------
+// <copyright file="BinaryCompatibility.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Util {
+    using System;
+    using System.Runtime.Versioning;
+
+    // This class contains utility methods that mimic the mscorlib internal System.Runtime.Versioning.BinaryCompatibility type.
+
+    internal sealed class BinaryCompatibility {
+
+        // We need to use this AppDomain key instead of AppDomainSetup.TargetFrameworkName since we don't want applications
+        // which happened to set TargetFrameworkName and are calling into ASP.NET APIs to suddenly start getting new behaviors.
+        internal const string TargetFrameworkKey = "ASPNET_TARGETFRAMEWORK";
+
+        // quick accessor for the current AppDomain's instance
+        public static readonly BinaryCompatibility Current = new BinaryCompatibility(AppDomain.CurrentDomain.GetData(TargetFrameworkKey) as FrameworkName);
+
+        public BinaryCompatibility(FrameworkName frameworkName) {
+            // parse version from FrameworkName, otherwise use a default value
+            Version version = VersionUtil.FrameworkDefault;
+            if (frameworkName != null && frameworkName.Identifier == ".NETFramework") {
+                version = frameworkName.Version;
+            }
+
+            TargetFramework = version;
+            TargetsAtLeastFramework45 = (version >= VersionUtil.Framework45);
+            TargetsAtLeastFramework451 = (version >= VersionUtil.Framework451);
+            TargetsAtLeastFramework452 = (version >= VersionUtil.Framework452);
+            TargetsAtLeastFramework46 = (version >= VersionUtil.Framework46);
+            TargetsAtLeastFramework461 = (version >= VersionUtil.Framework461);
+        }
+
+        public bool TargetsAtLeastFramework45 { get; private set; }
+        public bool TargetsAtLeastFramework451 { get; private set; }
+        public bool TargetsAtLeastFramework452 { get; private set; }
+        public bool TargetsAtLeastFramework46 { get; private set; }
+        public bool TargetsAtLeastFramework461 { get; private set; }
+
+        public Version TargetFramework { get; private set; }
+
+    }
+}