protected override Expression VisitLambda <T>(Expression <T> node)
{
var parPairs = node.Parameters.Select(x => (old: x, next: (ParameterExpression)Visit(x))).ToList();
var pars = parPairs.Select(x => x.next);
var dic = parPairs.ToDictionary(x => x.old, x => x.next);
Func <Expression, Expression> bodyTrans = ex =>
{
if (ex is ParameterExpression p && dic.TryGetValue(p, out var pret))
{
return(pret);
}
return(this.exprRep(ex));
};
var bodyVisitor = new ReplaceVisitor(bodyTrans, this.singleTypeRep, this.preserve);
var body = bodyVisitor.Visit(node.Body);
if (body != node.Body || !pars.SequenceEqual(node.Parameters))
{
var ret = Expression.Lambda(body, node.TailCall, pars);
return(ret);
}
return(node);
}
public static Expression Replace(Expression Expression, Expression Find, Expression ReplaceWith)
{
if (ReplaceWith == null)
{
throw new ArgumentException("ReplaceWith no puede ser null");
}
var V = new ReplaceVisitor(x => x == Find ? ReplaceWith : x, x => x, x => false);
return(V.Visit(Expression));
}
public static Expression Replace(Expression Expression, Func <Expression, Expression> replace)
{
var V = new ReplaceVisitor(replace, x => x, x => false);
return(V.Visit(Expression));
}