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