using System.Runtime.InteropServices;

 

namespace WindowsFormsApplication1
{
    public partial class NativeMethods
    {
        /// <summary>
        /// 启动控制台
        /// </summary>
        /// <returns></returns>
        [DllImport("kernel32.dll")]
        public static extern bool AllocConsole();
        /// <summary>
        /// 释放控制台
        /// </summary>
        /// <returns></returns>
        [DllImport("kernel32.dll")]
        public static extern bool FreeConsole();
    }
}

using System;
using System.Windows.Forms;

 

namespace WindowsFormsApplication1
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            try
            {
                if (args.Length > 0 && args[0].ToLower() == "-c")
                {//通过命令行 xxxx.exe -c 参数启动，Console

                    //注意：不用 Main(string[] args)、System.Environment.GetCommandLineArgs();  也可以取得命令行参数在任何地方

                    //启动
                    NativeMethods.AllocConsole();
                    Console.WriteLine("控制台以启动");
                }

                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1());
            }
            finally
            {
                //关闭 （如果在这个位置其实写不写都行了）
                NativeMethods.FreeConsole();
            }
        }
    }
}

using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

 

        private void btnOpenConsole_Click(object sender, EventArgs e)
        {
            //开启控制台
            NativeMethods.AllocConsole();
        }

        private void btnCloseConsole_Click(object sender, EventArgs e)
        {
            //关闭控制台
            NativeMethods.FreeConsole();
        }

        private void btnOut_Click(object sender, EventArgs e)
        {
            //模拟输出
            Console.WriteLine(textBox1.Text);
        }
    }
}