Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/aspnetwebstack/src/System.Web.WebPages/Common/DisposableAction.cs

@@ -0,0 +1,41 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
+
+namespace System.Web.WebPages
+{
+    internal class DisposableAction : IDisposable
+    {
+        private Action _action;
+        private bool _hasDisposed;
+
+        public DisposableAction(Action action)
+        {
+            if (action == null)
+            {
+                throw new ArgumentNullException("action");
+            }
+            _action = action;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            // If we were disposed by the finalizer it's because the user didn't use a "using" block, so don't do anything!
+            if (disposing)
+            {
+                lock (this)
+                {
+                    if (!_hasDisposed)
+                    {
+                        _hasDisposed = true;
+                        _action();
+                    }
+                }
+            }
+        }
+    }
+}