Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Expressions/BinaryExpressionHelper.cs

@@ -0,0 +1,62 @@
+//----------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//----------------------------------------------------------------
+
+namespace System.Activities.Expressions
+{
+    using System.Activities.Validation;
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    using System.Linq.Expressions;
+    using System.Runtime;
+
+    static class BinaryExpressionHelper
+    {
+        public static void OnGetArguments<TLeft, TRight>(CodeActivityMetadata metadata, InArgument<TLeft> left, InArgument<TRight> right)
+        {
+            RuntimeArgument rightArgument = new RuntimeArgument("Right", typeof(TRight), ArgumentDirection.In, true);
+            metadata.Bind(right, rightArgument);
+
+            RuntimeArgument leftArgument = new RuntimeArgument("Left", typeof(TLeft), ArgumentDirection.In, true);
+            metadata.Bind(left, leftArgument);
+
+            metadata.SetArgumentsCollection(
+                new Collection<RuntimeArgument>
+                {
+                    rightArgument,
+                    leftArgument
+                });
+        }
+
+        public static bool TryGenerateLinqDelegate<TLeft, TRight, TResult>(ExpressionType operatorType, out Func<TLeft, TRight, TResult> function, out ValidationError validationError)
+        {
+            function = null;
+            validationError = null;
+
+            ParameterExpression leftParameter = Expression.Parameter(typeof(TLeft), "left");
+            ParameterExpression rightParameter = Expression.Parameter(typeof(TRight), "right");
+
+            try
+            {
+                BinaryExpression binaryExpression = Expression.MakeBinary(operatorType, leftParameter, rightParameter);
+
+                Expression expressionToCompile = OperatorPermissionHelper.InjectReflectionPermissionIfNecessary(binaryExpression.Method, binaryExpression);
+                Expression<Func<TLeft, TRight, TResult>> lambdaExpression = Expression.Lambda<Func<TLeft, TRight, TResult>>(expressionToCompile, leftParameter, rightParameter);
+                function = lambdaExpression.Compile();
+
+                return true;
+            }
+            catch (Exception e)
+            {
+                if (Fx.IsFatal(e))
+                {
+                    throw;
+                }
+
+                validationError = new ValidationError(e.Message);
+                return false;
+            }
+        }
+    }
+
+}