New Post: Getting summary() output to C#

I'm running very simple script for decision tree computation using csv file:

engine.Evaluate("data <- read.csv('"+path.Replace("\", "\\")+"')");
engine.Evaluate("data$target <- factor(data$target)");
engine.Evaluate("rules <- C5.0(target ~ ., data = data, rules=TRUE, control=C5.0Control(winnow = TRUE, minCases = 50))");
engine.Evaluate("tree <- C5.0(target ~ ., data = data, control=C5.0Control(winnow = TRUE, minCases = 50))");

GenericVector summary1 = engine.Evaluate("summary(rules)").AsList();
GenericVector summary2 = engine.Evaluate("summary(tree)").AsList();

And I can't get any meaningful info from summary1/2. R should output some huge string with tree output.

What should I do?