C# - R interface

Question

I need to interface R to some C# application. I installed rscproxy_1.3 and R_Scilab_DCOM3.0-1B5 added COM references to the STATCONNECTORCLNT

Answer 1

Here is how to call a custom R Function from an Rdata file ( not just a built-in R function). Actually this is what worked for me. To get StatConnectorClass working, I had to open up the properties for StatConnectorsRVLib and set 'Embed Interop Types' to False.

using StatConnectorCommonLib;
using STATCONNECTORSRVLib;
using STATCONNECTORCLNTLib;

StatConnectorClass rConn = new StatConnectorClass();
            try
            {
                rConn.Init("R"); // here is where we initialize R 
                Response.Write("Initialized." + "
"); Response.Flush();
                Response.Write("1" + "
"); Response.Flush();
                string path = @"C:SOMEPATH\Black-Scholes.RData";
                rConn.SetSymbol("path", path); 
                Response.Write("2" + "
"); Response.Flush();
                rConn.Evaluate("load(path)");
                Response.Write("3" + "
"); Response.Flush();
                Int16 entry = 27; 
                rConn.SetSymbol("n1", entry);
                Response.Write("6" + "
"); Response.Flush();
                rConn.Evaluate("x1<-samplefn(n1)" ); 
                Response.Write("Entered : " + entry.ToString() + "
 "); 
                Object o = rConn.GetSymbol("x1");
                Response.Write("Ans:" + o.ToString() +  "
"); Response.Flush();
                rConn.Close();
            }
            catch (Exception ex)
            {
                Response.Write("Error: " + ex.Message );//+ " xx " +  rConn.GetErrorText());
                rConn.Close();
            }

Hope this helps!