Exemplo de chamada de RFC

SAP.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SAP.Middleware.Connector;

namespace exemplo
{
    public class Teste
    {
        // Configuracoes armazenadas no .config
        private static class SapConfigs
        {
            public static string Destination {
                get { return ConfigurationManager.AppSettings["SAP:DESTINATION"]; }
            }
            public static string Host {
                get { return ConfigurationManager.AppSettings["SAP:HOST"]; }
            }
            public static string SysNumber {
                get { return ConfigurationManager.AppSettings["SAP:SYSNUMBER"]; }
            }
            public static string Client {
                get { return ConfigurationManager.AppSettings["SAP:CLIENT"]; }
            }
            public static string User {
                get { return ConfigurationManager.AppSettings["SAP:USER"]; }
            }
            public static string Password {
                get { return ConfigurationManager.AppSettings["SAP:PASSWORD"]; }
            }
            public static string Function {
                get { return ConfigurationManager.AppSettings["SAP:FUNCTION"]; }
            }
        }
        
        // Parametros que enviaremos para a funcao no SAP
        public class Form
        {
            public string solicitante { get; set; }
            public string centroCusto { get; set; }
            public string emailSolicitante { get; set; }
        }

        // Faz a chamada RFC de teste
        public string Solicitar(Form dados)
        {
            var rfcParams = new RfcConfigParameters();

            // Alimenta parametros SAP Logon
            rfcParams.Add(RfcConfigParameters.Name, SapConfigs.Destination);
            rfcParams.Add(RfcConfigParameters.AppServerHost, SapConfigs.Host);
            rfcParams.Add(RfcConfigParameters.SystemNumber, SapConfigs.SysNumber);

            // Alimenta parametros SAP GUI
            rfcParams.Add(RfcConfigParameters.Client, SapConfigs.Client);
            rfcParams.Add(RfcConfigParameters.User, SapConfigs.User);
            rfcParams.Add(RfcConfigParameters.Password, SapConfigs.Password);

            // Faz a conexao rfc
            var destination = RfcDestinationManager.GetDestination(rfcParams);
            RfcRepository repo = destination.Repository;
            IRfcFunction function = repo.CreateFunction(SapConfigs.Function);

            function.SetValue("SOLICITANTE", dados.solicitante);
            function.SetValue("CENTRO_CUSTO", dados.centroCusto);
            function.SetValue("EMAIL_SOLIC", dados.emailSolicitante);
            
            // Chama a funcao
            function.Invoke(destination);

            // Aguarda e recebe retoro
            var result = function.GetDecimal("E_NSOLIC");

            return result.ToString();
        }

        // Ping para checar conexao com SAP
        public void Ping()
        {
            var rfcParams = new RfcConfigParameters();

            // Alimenta parametros SAP Logon
            rfcParams.Add(RfcConfigParameters.Name, SapConfigs.Destination);
            rfcParams.Add(RfcConfigParameters.AppServerHost, SapConfigs.Host);
            rfcParams.Add(RfcConfigParameters.SystemNumber, SapConfigs.SysNumber);

            // Alimenta parametros SAP GUI
            rfcParams.Add(RfcConfigParameters.Client, SapConfigs.Client);
            rfcParams.Add(RfcConfigParameters.User, SapConfigs.User);
            rfcParams.Add(RfcConfigParameters.Password, SapConfigs.Password);

            // Faz a conexao rfc
            var destination = RfcDestinationManager.GetDestination(rfcParams);
            RfcRepository repo = destination.Repository;
            destination.Ping();
        }
    }
}