Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/AsyncCodeActivityContext.cs

@@ -0,0 +1,57 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.Activities
+{
+    using System.Activities.Runtime;
+    using System.Runtime;
+
+    [Fx.Tag.XamlVisible(false)]
+    public sealed class AsyncCodeActivityContext : CodeActivityContext
+    {
+        AsyncOperationContext asyncContext;
+
+        internal AsyncCodeActivityContext(AsyncOperationContext asyncContext, ActivityInstance instance, ActivityExecutor executor)
+            : base(instance, executor)
+        {
+            this.asyncContext = asyncContext;
+        }
+
+        public bool IsCancellationRequested
+        {
+            get
+            {
+                ThrowIfDisposed();
+                return this.CurrentInstance.IsCancellationRequested;
+            }
+        }
+
+        public object UserState
+        {
+            get
+            {
+                ThrowIfDisposed();
+                return this.asyncContext.UserState;
+            }
+            set
+            {
+                ThrowIfDisposed();
+                this.asyncContext.UserState = value;
+            }
+        }
+
+        public void MarkCanceled()
+        {
+            ThrowIfDisposed();
+
+            // This is valid to be called while aborting or while canceling
+            if (!this.CurrentInstance.IsCancellationRequested && !this.asyncContext.IsAborting)
+            {
+                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.MarkCanceledOnlyCallableIfCancelRequested));
+            }
+
+            this.CurrentInstance.MarkCanceled();
+        }
+    }
+}