有参数的程序，可以被调用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.IO;

namespace SendMail
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] Arrs)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
           //Application.Run(new Form1());
            if (Arrs == null) { WriteErr("No Parameter"); return; }

            string sfrom = "";
            string sto = "";
            string scc = "";
            string sbcc = "";
            string ssubject = "";
            string sbody = "";
            string satt = "";
            string[] Arr = Arrs[0].Split('|');
            if (Arr.Length > 0)
                sfrom = Arr[0];
            if (Arr.Length > 1)
                sto = Arr[1];
            if (Arr.Length > 2)
                scc = Arr[2];
            if (Arr.Length > 3)
                sbcc = Arr[3];
            if (Arr.Length > 4)
                ssubject = Arr[4];
            if (Arr.Length > 5)
                sbody = Arr[5];
            if (Arr.Length > 6)
                satt = Arr[6];
            if (sfrom == "" || (sto == "" && scc == "")) { WriteErr("Parameter Error"); return; }

            SendMail.Mail SendMail = new SendMail.Mail();
            string Err = SendMail.SendMail(sfrom, sto, scc, sbcc, ssubject, sbody, satt);
            WriteErr(Err);
        }

        static void WriteErr(string strErr)
        {
            if (strErr == "") return;
            System.IO.StreamWriter sw;
            sw = new StreamWriter(Application.StartupPath + "\Error.err", false, System.Text.Encoding.Default);
            sw.WriteLine(strErr);
            sw.Flush();
            sw.Close();
        }
    }
}