stay Qt in , Frequently used qDebug()<<"Hello World"; To print some output to the console , In order to observe the operation of the program .

stay Java in (eclipse,myeclipse in ), What is often used is System.out.println("Hello World"); The way .

stay Android in , What is often used is Log.d("Hello World");

. .

stay C# When , Using Console.WriteLine("Hello World");

development winform When , The following main function needs to be added to the file .

Lead into storage :
using System.Runtime.InteropServices;

stay Main() Front , add to :

[DllImport("kernel32.dll")]
public static extern bool AllocConsole();
[DllImport("kernel32.dll")]
static extern bool FreeConsole();

stay Main() in , First line added :

AllocConsole();

stay Main() in , Add last line :

FreeConsole();

Examples :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
// console output , Need to join this library
using System.Runtime.InteropServices;

namespace HelloWorld_WindowsForm
{
    static class Program
    {
        [DllImport("kernel32.dll")]
        public static extern bool AllocConsole();
        [DllImport("kernel32.dll")]
        static extern bool FreeConsole();

        /// <summary>
        /// The main entry point for the application .
        /// </summary>
        [STAThread]
        static void Main()
        {
            // Allow calling console output
            AllocConsole();

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new LoginPage());

            // release
            FreeConsole();
        }
    }
}
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