IT유령회사

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace bitCheck
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void textBox1_Validated(object sender, EventArgs e)
        {
            this.label1.Text = Regex.IsMatch(this.textBox1.Text, @"[ㄱ-ㅎ가-힣]").ToString();
        }

        private void textBox2_Validated(object sender, EventArgs e)
        {
            this.label2.Text = Regex.IsMatch(this.textBox2.Text, @"[ㄱ-ㅎ가-힣]").ToString();
        }
    }
}

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

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int sum = 0;

            new LoadingForm(() => {
                                    for (int i = 0; i < 1000; i++)
                                    {
                                        sum += i;
                                    }

                                    Thread.Sleep(3000);

                                    Action act = () => this.label1.Text = sum.ToString();

                                    if (this.InvokeRequired)
                                        this.BeginInvoke(act);
                                    else
                                        act();
                                  }).ShowDialog();
        }
    }
}

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

namespace WindowsFormsApp2
{
    public partial class LoadingForm : Form
    {
        private readonly MethodInvoker method;

        public LoadingForm(MethodInvoker action)
        {
            InitializeComponent();
            this.Load += LoadingForm_Load;

            this.method = action;

            this.TopMost = true;
            this.StartPosition = FormStartPosition.CenterScreen;
        }

        private void LoadingForm_Load(object sender, EventArgs e)
        {
            new Thread(() =>
            {
                method.Invoke();
                InvokeAction(this, Dispose);
            }).Start();
        }

        private void InvokeAction(LoadingForm control, MethodInvoker action)
        {
            if (control.InvokeRequired)
                control.BeginInvoke(action);
            else
                action();
        }
    }
}

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

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_DoubleClick(object sender, EventArgs e)
        {
            this.textBox1.Focus();
            SendKeys.Send("ABCDE");
        }
    }
}

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

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if(this.pictureBox1.Image != null)
            {
                try
                {
                    Bitmap bitmap = new Bitmap(this.pictureBox1.Image);
                    Color color = bitmap.GetPixel(e.X, e.Y);
                    this.label1.Text = $"RED : {color.R} GREEN : {color.G} BLUE : {color.B}";
                }
                catch (Exception)
                {
                }
            }
        }
    }
}

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

namespace WindowsFormsApp5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            foreach (Form frm in Application.OpenForms)
            {
                if(frm.Name == "PopUp")
                {
                    frm.Activate();
                    return;
                }
            }

            PopUp sfrm = new PopUp();
            sfrm.Show();
        }
    }
}

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

namespace WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.AllowDrop = true;
            this.DragDrop += Form1_DragDrop;
            this.DragEnter += Form1_DragEnter;
        }

        private void Form1_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Copy | DragDropEffects.Scroll;
            }
        }

        private void Form1_DragDrop(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] file = (string[])e.Data.GetData(DataFormats.FileDrop);
                foreach (string str in file)
                {
                    this.textBox1.Text += str + "\r" + "\n";
                }
            }
        }
    }
}

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

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        private Point startPoint = Point.Empty;
        private Point movePoint  = Point.Empty;
        bool isClick = false;

        public Form1()
        {
            InitializeComponent();
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                isClick = true;
                this.startPoint = new Point(e.Location.X - movePoint.X, e.Location.Y - movePoint.Y);
            }
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isClick)
            {
                this.movePoint = new Point(e.Location.X - startPoint.X, e.Location.Y - startPoint.Y);
                this.pictureBox1.Invalidate();
            }
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            if (isClick) isClick = false;
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.Clear(Color.White);

            if (this.pictureBox1.Image != null)
                e.Graphics.DrawImage(this.pictureBox1.Image, movePoint);
        }
    }
}

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using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            object[] obj = new object[2];
            obj[0] = 1;
            obj[1] = "strValue";

            // is는 특정 객체 형변환이 가능한지 여부 확인         
            Console.WriteLine("Test  : " + (obj[0] is int));
            Console.WriteLine("Test  : " + (obj[0] is string));

            // as는 특정 객체 형변환이 가능하면 형변환객체를 불가능 하면 null을 반환한다.
            Console.WriteLine("Test  : " + ((obj[0] as string) == null ? "null" : obj[0]));
            Console.WriteLine("Test  : " + ((obj[1] as string) == null ? "null" : obj[1]));

            Console.Read();
        }
    }    
}