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Windows Forms에서 컨트롤 사용 개요

이 항목에서는 Windows Forms 응용 프로그램의 필수 요소를 설명하며 Windows Forms 응용 프로그램에서 컨트롤을 사용하고 이벤트를 처리하는 간단한 예제를 제공합니다.

단순 Windows Forms 응용 프로그램

Windows Forms 응용 프로그램은 최소한 다음 요소로 구성됩니다.

  • System.Windows.Forms.Form에서 파생된 하나 이상의 클래스

  • static(Visual Basic의 경우 shared) Run 메서드를 호출하고 이 메서드에 Form 인스턴스를 전달하는 Main 메서드 Run 메서드는 운영 체제에서 응용 프로그램으로 메시지를 처리합니다.

다음 코드 예제에서는 Windows Forms 응용 프로그램의 필수 요소를 보여 줍니다.

Option Explicit
Option Strict

Imports System
Imports System.Windows.Forms

Public Class MyForm
   Inherits Form
   
   Public Sub New()
      Me.Text = "Hello World"
   End Sub 'New
   
   <STAThread()> _
   Public Shared Sub Main()
      Dim aform As New MyForm()
      ' The Application.Run method processes messages from the operating system 
      ' to your application. If you comment out the next line of code, 
      ' your application will compile and execute, but because it is not in the
      ' message loop, it will exit after an instance of the form is created.
      Application.Run(aform)
   End Sub
End Class
using System;
using System.Windows.Forms;

public class MyForm : Form {

   public MyForm() {
      this.Text = "Hello World";
   }
   [STAThread]
   public static void Main(string[] args) {
     MyForm aform = new MyForm();
// The Application.Run method processes messages from the operating system 
// to your application. If you comment out the next line of code, 
// your application will compile and execute, but because it is not in the // message loop, it will exit after an instance of the form is created.
      Application.Run(aform);
   }
}

Windows Forms 응용 프로그램에서 컨트롤 사용

다음 코드 예제에서는 Windows Forms 응용 프로그램에서 컨트롤을 사용하고 이벤트를 처리하는 방법을 설명하는 간단한 응용 프로그램을 보여 줍니다. 예제는 폼의 세 가지 단추로 구성되는데, 각 단추를 클릭하면 배경색이 바뀝니다.

Option Explicit
Option Strict

Imports System
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Resources
Imports System.Drawing

Public Class MyForm
   Inherits Form
   Private red As Button
   Private blue As Button
   Private green As Button
   
   Public Sub New()
      InitializeComponent()
   End Sub
   
   
   Protected Overloads Overrides Sub Dispose(disposing as Boolean)
      MyBase.Dispose(disposing)
   End Sub
   
   ' InitializeComponent is a helper method for the constructor. 
   ' It is included for consistency with code that is 
   ' auto-generated by the Windows Forms designer in Visual Studio. 
   Private Sub InitializeComponent()
      
      ' Creates three buttons, sets their properties, and attaches
      ' an event handler to each button.
      red = New Button()
      red.Text = "Red"
      red.Location = New Point(100, 50)
      red.Size = New Size(50, 50)
      AddHandler red.Click, AddressOf button_Click
      Controls.Add(red)
      
      blue = New Button()
      blue.Text = "Blue"
      blue.Location = New Point(100, 100)
      blue.Size = New Size(50, 50)
      AddHandler blue.Click, AddressOf button_Click
      Controls.Add(blue)
      
      green = New Button()
      green.Text = "Green"
      green.Location = New Point(100, 150)
      green.Size = New Size(50, 50)
      AddHandler green.Click, AddressOf button_Click
      Controls.Add(green)
   End Sub
   
   ' Event handler.
   Private Sub button_Click(sender As Object, e As EventArgs)
      If sender Is red Then
         Me.BackColor = Color.Red
      Else
         If sender Is blue Then
            Me.BackColor = Color.Blue
         Else
            Me.BackColor = Color.Green
         End If
      End If 
   End Sub

   ' The STAThreadAttribute informs the common language runtime that
   ' Windows Forms uses the single-threaded apartment model.
   <STAThread()> _
   Public Shared Sub Main()
      Application.Run(New MyForm())
   End Sub
End Class
using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Resources;
using System.Drawing;

public class MyForm : Form {
   private Button red;
   private Button blue;
   private Button green;

   public MyForm() : base() {   
      InitializeComponent();   
   }

   protected override void Dispose(bool disposing) {
      base.Dispose(disposing);
   }
   
// InitializeComponent is a helper method for the constructor. 
// It is included for consistency with code that is 
// auto-generated by the Windows Forms designer in Visual Studio. 
   private void InitializeComponent() {
   
// A delegate for the click event of a button. The argument to 
// the constructor contains a reference to the method that performs the 
// event handling logic.
      EventHandler handler = new EventHandler(button_Click);
   
// Creates three buttons, sets their properties, and attaches
// an event handler to each button.

      red = new Button();
      red.Text = "Red";
      red.Location = new Point(100, 50);
      red.Size = new Size(50, 50);
      red.Click +=handler;
      Controls.Add(red);
      
      blue = new Button();
      blue.Text = "Blue";
      blue.Location = new Point(100, 100);
      blue.Size = new Size(50, 50);
      blue.Click += handler;
      Controls.Add(blue);
      
      green = new Button();
      green.Text = "Green";
      green.Location = new Point(100, 150);
      green.Size = new Size(50, 50);
      green.Click += handler;
      Controls.Add(green);      
      }
      
   // Event handler.
   private void button_Click(object sender, EventArgs e) {
            if (sender == red) this.BackColor = Color.Red ;
                  else if (sender == blue) this.BackColor = Color.Blue;
                  else this.BackColor = Color.Green;
        }
   // The STAThreadAttribute informs the common language runtime that
   // Windows Forms uses the single-threaded apartment model.
  [STAThread]
   public static void Main(string[] args) {
   Application.Run(new MyForm());
   }
   
}

참고 항목

개념

Windows Forms 컨트롤 개발 기본 사항

기타 리소스

.NET Framework에서 사용자 지정 Windows Forms 컨트롤 개발