BinaryExpressionHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Expressions / BinaryExpressionHelper.cs / 1305376 / BinaryExpressionHelper.cs
                        

                        
                            //---------------------------------------------------------------- 
// 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(CodeActivityMetadata metadata, InArgument left, InArgument 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
                { 
                    rightArgument, 
                    leftArgument
                }); 
        }

        public static bool TryGenerateLinqDelegate(ExpressionType operatorType, out Func 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> lambdaExpression = Expression.Lambda>(binaryExpression, leftParameter, rightParameter); 
                function = lambdaExpression.Compile();
                return true; 
            } 
            catch (Exception e)
            { 
                if (Fx.IsFatal(e))
                {
                    throw;
                } 

                validationError = new ValidationError(e.Message); 
                return false; 
            }
        } 
    }

}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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