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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;
namespace Signum.Utilities.ExpressionTrees
{
public class ExpressionReplacer: SimpleExpressionVisitor
{
Dictionary<ParameterExpression, Expression> replacements = new Dictionary<ParameterExpression, Expression>();
public static Expression Replace(InvocationExpression invocation)
{
LambdaExpression lambda = invocation.Expression as LambdaExpression;
var replacer = new ExpressionReplacer()
{
replacements = 0.To(lambda.Parameters.Count).ToDictionary(i => lambda.Parameters[i], i => invocation.Arguments[i])
};
return replacer.Visit(lambda.Body);
}
public static Expression Replace(Expression expression, Dictionary<ParameterExpression, Expression> replacements)
{
var replacer = new ExpressionReplacer()
{
replacements = replacements
};
return replacer.Visit(expression);
}
protected override Expression VisitParameter(ParameterExpression p)
{
return replacements.TryGetC(p) ?? p;
}
}
}
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I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.
www.signumframework.com
I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...