From fb85fb8c19a2de21a503aea037682eff00a01977 Mon Sep 17 00:00:00 2001
From: Jan Tattermusch <jtattermusch@google.com>
Date: Tue, 30 Jul 2019 11:44:02 -0700
Subject: [PATCH] make Grpc.Auth build again

---
 src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs b/src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs
index d859075c3bd..e6c973431d7 100644
--- a/src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs
+++ b/src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs
@@ -61,7 +61,7 @@ namespace Grpc.Auth
             return new AsyncAuthInterceptor((context, metadata) =>
             {
                 metadata.Add(CreateBearerTokenHeader(accessToken));
-                return TaskUtils.CompletedTask;
+                return GetCompletedTask();
             });
         }
 
@@ -69,5 +69,17 @@ namespace Grpc.Auth
         {
             return new Metadata.Entry(AuthorizationHeader, Schema + " " + accessToken);
         }
+
+        /// <summary>
+        /// Framework independent equivalent of <c>Task.CompletedTask</c>.
+        /// </summary>
+        private static Task GetCompletedTask()
+        {
+#if NETSTANDARD1_5 || NETSTANDARD2_0
+            return Task.CompletedTask;
+#else
+            return Task.FromResult<object>(null);  // for .NET45, emulate the functionality
+#endif
+        }
     }
 }