Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/entityframework/src/EntityFramework/Infrastructure/IDbAsyncQueryProviderExtensions.cs

@@ -0,0 +1,39 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+
+#if !NET40
+
+namespace System.Data.Entity.Infrastructure
+{
+    using System.Linq.Expressions;
+    using System.Threading;
+    using System.Threading.Tasks;
+
+    public static class IDbAsyncQueryProviderExtensions
+    {
+        /// <summary>
+        ///     Asynchronously executes the query represented by a specified expression tree.
+        /// </summary>
+        /// <returns> A Task containing the value that results from executing the specified query. </returns>
+        /// <param name="expression"> An expression tree that represents a LINQ query. </param>
+        /// <param name="cancellationToken"> The token to monitor for cancellation requests. </param>
+        public static Task<object> ExecuteAsync(this IDbAsyncQueryProvider provider, Expression expression)
+        {
+            return provider.ExecuteAsync(expression, CancellationToken.None);
+        }
+
+        /// <summary>
+        ///     Asynchronously executes the strongly-typed query represented by a specified expression tree.
+        /// </summary>
+        /// <returns> A Task containing the value that results from executing the specified query. </returns>
+        /// <param name="expression"> An expression tree that represents a LINQ query. </param>
+        /// <typeparam name="TResult"> The type of the value that results from executing the query. </typeparam>
+        /// <param name="cancellationToken"> The token to monitor for cancellation requests. </param>
+        public static Task<TResult> ExecuteAsync<TResult>(this IDbAsyncQueryProvider provider, Expression expression)
+        {
+            return provider.ExecuteAsync<TResult>(expression, CancellationToken.None);
+        }
+    }
+}
+
+#endif