public static LambdaExpression Rewrite(Expression body, ParameterExpression[] parameters)
{
var rewriter = new ParamArrayRewriter(parameters);
var newBody = rewriter.Visit(body);
return(Expression.Lambda(newBody, paramParam));
}
public static LambdaExpression Extract(Expression exp, out IList <object> values)
{
var extractor = new ConstantExtractor();
var body = extractor.Visit(exp);
values = extractor.constantValues.ToArray();
if (values.Count >= 5)
{
// Can't create a lambda with more than 4 parameters. Go figure.
values = new object[] { values };
return(ParamArrayRewriter.Rewrite(body, extractor.newParameters.ToArray()));
}
return(Expression.Lambda(body, extractor.newParameters.ToArray()));
}
