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Windows Forms에서 컨트롤 사용 개요

  • 아티클

이 토픽에서는 Windows Forms 애플리케이션의 필수 요소에 대해 설명하고 Windows Forms 애플리케이션에서 컨트롤을 사용하고 이벤트를 처리하는 간단한 예제를 제공합니다.

간단한 Windows Forms 애플리케이션

최소한 Windows Forms 애플리케이션은 다음 요소로 구성됩니다.

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

  • static(Visual Basic에서는 shared) Run 메서드를 호출하고 거기에 Form 인스턴스를 전달하는 Main 메서드. Run 메서드는 운영 체제에서 애플리케이션으로 메시지를 처리합니다.

다음 코드 예제에서는 Windows Forms 애플리케이션의 필수 요소를 보여줍니다.

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 애플리케이션에서 컨트롤 사용

다음 코드 예제에서는 Windows Forms 애플리케이션에서 컨트롤을 사용하고 이벤트를 처리하는 방법을 보여 주는 간단한 애플리케이션을 보여 줍니다. 이 예제는 양식에 있는 세 개의 단추로 구성됩니다. 각 단추를 클릭하면 배경색이 변경됩니다.

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