Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

mcs/class/System.Private.CoreLib/System/AppContext.cs

@@ -0,0 +1,25 @@
+using System.IO;
+using System.Reflection;
+
+namespace System
+{
+	partial class AppContext
+	{
+		// Called by the runtime
+		internal static unsafe void Setup (char** pNames, char** pValues, int count)
+		{
+			for (int i = 0; i < count; i++)
+				s_dataStore.Add (new string ((sbyte*)pNames[i]), new string ((sbyte*)pValues[i]));
+		}
+
+		static string? GetBaseDirectoryCore ()
+		{
+			// Fallback path for hosts that do not set APP_CONTEXT_BASE_DIRECTORY explicitly
+			var directory = Path.GetDirectoryName (Assembly.GetEntryAssembly()?.Location);
+			if (directory != null && !Path.EndsInDirectorySeparator (directory))
+				directory += Path.DirectorySeparatorChar;
+
+			return directory;
+		}
+	}
+}