Help with C# GUI and ActionListener

HelloWorld · #1 (**permalink**) 08-05-2007, 11:57 PM

Here's my current .cs code:

PHP Code:

  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DChat
{
    public partial class DChat : Form
    {
        public DChat()
        {
            InitializeComponent();
        }

        private void ServerTextBox(object sender, EventArgs e)
        {

        }

        private void SendButton(object sender, EventArgs e)
        {
           
        }

        private void ServerTextField(object sender, EventArgs e)
        {

        }

        public static void main()
        {
            new DChat();
        }
    }
}

It seems like much easier to design GUI in C# than Java lol.. well, that's probably I didn't use any software designer for it, but yeah, I'm trying to create a networking application with C#. I'm still not sure what to use to add ActionListener (in java) for C#...

I got this error for my current code:
Error 1 Program 'C:\Documents and Settings\HelloWorld\My Documents\Visual Studio 2005\Projects\DChat\DChat\obj\Debug\DChat.exe' does not contain a static 'Main' method suitable for an entry point DChat

TeraTask · #2 (**permalink**) 08-06-2007, 08:21 AM

I don't understand your question. Your code is interesting though as new DChat is called within DChat itself, thereby creating a recursive call? How did you create this? What kind of app did you choose when you created it?

I'm rather new to C# too.

Bench · #3 (**permalink**) 08-06-2007, 11:02 AM

Quote:

Originally Posted by TeraTask

I don't understand your question. Your code is interesting though as new DChat is called within DChat itself, thereby creating a recursive call? How did you create this? What kind of app did you choose when you created it?

I'm rather new to C# too.

I don't do much C# but..

a static function inside a class doesn't belong to objects created of that class, but to the class itself (Where a class is like a cookie-cutter for objects. Many instances/objects of the class can exist, but the class itself only exists once).

in a way, a static function is like a global function, which exists once and only once for the lifetime of the entire program.

In fact, a class can create objects of itself at any time. Although a constructor should be careful in creating objects of its own class, since there is the potential for an infinite loop there (an object's constructor calling an object's constructor calling an object's constructor.. etc)

As to the original error message, I think C# does an unusual thing of capitalising the first letter of Main() - your main() is a lowercase 'm' (as per C/C++/Java)

HelloWorld · #4 (**permalink**) 08-06-2007, 05:48 PM

Quote:

I don't understand your question. Your code is interesting though as new DChat is called within DChat itself, thereby creating a recursive call?

No, this is not a recursive call. I'm instantiating the class of DChat within my main method, so it's basically calling this class. Recursive is a method calling itself, however, this is a method that's calling a class named DChat.

HelloWorld · #5 (**permalink**) 08-06-2007, 11:33 PM

LOL, this is really dumb.. I had to do this to get the GUI works

PHP Code:

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

namespace DChat
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

I guess I deleted the Program.cs lol...

#6 (**permalink**) 08-07-2007, 10:24 PM

And for the record, creating a new instance of a form class is only half the battle. You can create and cache instances for later use ... but if you don't call Form.Show() or Form.ShowDialog() ... which Application.Run() does ... nothing happens.

In theory just instantiating a new form would allocate some memory and call its constructor, but I think the compiler will recognize that you're never using the object, and optimize it out of the final code.

HelloWorld · #7 (**permalink**) 08-09-2007, 12:08 AM

Quote:

And for the record, creating a new instance of a form class is only half the battle. You can create and cache instances for later use ... but if you don't call Form.Show() or Form.ShowDialog() ... which Application.Run() does ... nothing happens.

yeah, it's really similar with Java where you have to setVisible(true) lol...
But I'm not sure where should I put that line that you're talking about here? I just instantiate the instance of the Form1 on my current code, where do you see the Form.Show() ???

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TeraTask (08-06-2007)