如何使用c＃同时运行表单和控制台？

Question

Hey I am fairly new to the c# programming language and have enjoyed my experience so far. I normally develop applications in java but a need for the win32 library has lead me to c# so far the languages seem relatively similar. however a problem I am having at the moment is a simple piece of code that can be best explained in this example

I am trying to print a piece of string to console then display the windows form then print another piece of string to console. however the result i get is first string is printed then the form is displayed, i then have to close the form before the last string is printed. the question i would like to ask is is there anyway to get this working so the second print to console is displayed immediately after the form is displayed. im guessing it has something to do with threading but I am not entirely sure how to implement this

Answer 1

The solution is quite simple: Just create a Windows Forms Application (when creating the project - which you probably did) and then go to Properties (in context menu "Project", it's the last item) and set "Output type" to "Console Application". The forms will work as before and furthermore the application will now open the console too. You can then freely write to or read from the console.

Answer 2

It sounds like you want to be able to output messages to the console while the form is being displayed, correct? The basic issue is that as long as the form is visible, there must be a message loop running, handling events for the form. The message loop is inside Application.Run, so once you call it, it won't return until the form is closed (as you discovered).

So if you want to write to the console while the form is visible, you have a couple of options. One, as you mentioned, is to use multiple threads. Let your main thread run the message loop, and start up a second thread to write to the console. But that's not necessary--you can also write to the console from within an event handler, directly or indirectly. There's nothing wrong with doing a Console.WriteLine from within a button click handler. Or you can have your button handler call a method in your Program class, and do the writing there.

As for which solution is better, it would help to know more about what you're trying to accomplish. I assume that you don't just want to write stuff to the console--what else is it that you want to do while the form is being displayed?

Answer 3

My suggestion would be to start with a Console application. You can always open a WinForm from a console application...which would give you exactly what you're looking for. (you might want to think about multi-threading as well.

Answer 4

static class Program
{
    [STAThread]
    static void Main()
    {
        Console.WriteLine("first string");
        var form = new Form1();
        form.Show();
        Console.WriteLine("the second string");
        Application.Run();
    }
}

Answer 5

Hey everyone thanks for your answers I made some progress with what im trying to achieve but im not sure how correct or thread safe it is here is the code i got to run

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Windows.Forms;

    namespace Project1
    {
    class Class2
    {

        [STAThread]
        static void Main()
        {
           Console.WriteLine("hello");
           Class2 t = new Class2();
           t.test();
           Console.WriteLine("second string");
        }



        public void test()
        {
            Thread t = new Thread(new ThreadStart(StartNewStaThrea));
            t.Start();
        }


        private void StartNewStaThrea()
        { 
            Application.Run(new Form1()); 
        }

    }
}

pls let me know what you think of this solution

Answer 6

are you using form.showDialog() or form.show() ?

form.showDialog() will block until the form is closed, while form.show() will not.

Answer 7

I would either start with a console app, and run the application from the static main function. This is from memory - I haven't had to mess with Winforms for years:

[STAThread]
static void Main()
{
  Application.Run(new YourMainForm()); 
}

or

I would redirect Console.Out and shove that stream into a some sort of control like a text box or list box. This is a lot of code but doable... I have written this before for on-site debugging but don't have the code handy.

Answer 8

Why don't you just create a new windows form with multiline textbox and dock it to the form, set BackColor as Black ForeColor as White and create a public method to send text to that textBox.

If your aim is a one Form application this works pretty much brilliantly.

Answer 9

I know this is a super-old question, but I'm going to answer in hopes of karma. One interesting work-around that works well for this comes up if you're using Visual Studio (which is a fairly safe assumption). If you start a forms project in C# in Visual Studio, then make your appropriate forms, but then change the project type to a console application (by right clicking the project-->properties-->Console Application), it will still spawn your forms, but will also keep a Console open, now all you need to do is put one Console.Write statement before your form is created, and the other after, and maybe add a flush statement!