Control.LostFocus 이벤트

정의

컨트롤이 포커스를 잃을 때 발생합니다.Occurs when the control loses focus.

public:
 event EventHandler ^ LostFocus;
[System.ComponentModel.Browsable(false)]
public event EventHandler LostFocus;
member this.LostFocus : EventHandler 
Public Custom Event LostFocus As EventHandler 
특성

예제

다음 코드 예제에서는 TextBox1 텍스트의 유효성을 검사 하는 방법을 보여 줍니다.The following code example demonstrates validating the text for TextBox1. 또한 FileDialog.InitialDirectory 속성을 TextBox1의 텍스트로 설정 하 여 LostFocus 이벤트를 처리 하는 방법을 보여 줍니다.It also demonstrates handling the LostFocus event by setting the FileDialog.InitialDirectory property to the text in TextBox1. 코드 예제에서는 ErrorProvider.GetError 메서드를 사용 하 여 파일 대화 상자를 열기 전에 오류를 확인 합니다.The code example used the ErrorProvider.GetError method to check for an error before opening the file dialog box. 이 예제를 실행 하려면 TextBox1라는 TextBox, 이름이 OpenFileDialog1OpenFileDialog, Button 이라는 Button1, ErrorProvider 라는 ErrorProvider1포함 된 양식에 다음 코드를 붙여넣습니다.To run this example, paste the following code into a form containing a TextBox named TextBox1, an OpenFileDialog named OpenFileDialog1, a Button named Button1, and an ErrorProvider named ErrorProvider1. 모든 이벤트가 해당 이벤트 처리기와 연결 되어 있는지 확인 합니다.Ensure all events are associated with their event handlers.

private:
   void TextBox1_Validating( Object^ sender,
      System::ComponentModel::CancelEventArgs^ e )
   {
      // If nothing is entered,
      // an ArgumentException is caught; if an invalid directory is entered, 
      // a DirectoryNotFoundException is caught. An appropriate error message 
      // is displayed in either case.
      try
      {
         System::IO::DirectoryInfo^ directory = gcnew System::IO::DirectoryInfo( TextBox1->Text );
         directory->GetFiles();
         ErrorProvider1->SetError( TextBox1, "" );
      }
      catch ( System::ArgumentException^ ) 
      {
         ErrorProvider1->SetError( TextBox1, "Please enter a directory" );
      }
      catch ( System::IO::DirectoryNotFoundException^ ) 
      {
         ErrorProvider1->SetError( TextBox1, "The directory does not exist."
         "Try again with a different directory." );
      }
   }

   // This method handles the LostFocus event for TextBox1 by setting the 
   // dialog's InitialDirectory property to the text in TextBox1.
   void TextBox1_LostFocus( Object^ sender, System::EventArgs^ e )
   {
      OpenFileDialog1->InitialDirectory = TextBox1->Text;
   }

   // This method demonstrates using the ErrorProvider.GetError method 
   // to check for an error before opening the dialog box.
   void Button1_Click( System::Object^ sender, System::EventArgs^ e )
   {
      //If there is no error, then open the dialog box.
      if ( ErrorProvider1->GetError( TextBox1 )->Equals( "" ) )
      {
         ::DialogResult dialogResult = OpenFileDialog1->ShowDialog();
      }
   }
private void textBox1_Validating(object sender, 
    System.ComponentModel.CancelEventArgs e)
{
    // If nothing is entered,
    // an ArgumentException is caught; if an invalid directory is entered, 
    // a DirectoryNotFoundException is caught. An appropriate error message 
    // is displayed in either case.
    try
    {
        System.IO.DirectoryInfo directory = 
            new System.IO.DirectoryInfo(textBox1.Text);
        directory.GetFiles();
        errorProvider1.SetError(textBox1, "");

    }
    catch(System.ArgumentException ex1)
    {
        errorProvider1.SetError(textBox1, "Please enter a directory");

    }
    catch(System.IO.DirectoryNotFoundException ex2)
    {
        errorProvider1.SetError(textBox1, "The directory does not exist." +
            "Try again with a different directory.");
    }

}

// This method handles the LostFocus event for textBox1 by setting the 
// dialog's InitialDirectory property to the text in textBox1.
private void textBox1_LostFocus(object sender, System.EventArgs e)
{
    openFileDialog1.InitialDirectory = textBox1.Text;
}

// This method demonstrates using the ErrorProvider.GetError method 
// to check for an error before opening the dialog box.
private void button1_Click(System.Object sender, System.EventArgs e)
{
    //If there is no error, then open the dialog box.
    if (errorProvider1.GetError(textBox1)=="")
    {
        DialogResult dialogResult = openFileDialog1.ShowDialog();
    }
}
Private Sub TextBox1_Validating(ByVal sender As Object, _
ByVal e As System.ComponentModel.CancelEventArgs) _
Handles TextBox1.Validating

    ' If nothing is entered,
    ' an ArgumentException is caught; if an invalid directory is entered, 
    ' a DirectoryNotFoundException is caught. An appropriate error message 
    ' is displayed in either case.
    Try
        Dim directory As New System.IO.DirectoryInfo(TextBox1.Text)
        directory.GetFiles()
        ErrorProvider1.SetError(TextBox1, "")

    Catch ex1 As System.ArgumentException
        ErrorProvider1.SetError(TextBox1, "Please enter a directory")

    Catch ex2 As System.IO.DirectoryNotFoundException
        ErrorProvider1.SetError(TextBox1, _
        "The directory does not exist." & _
        "Try again with a different directory.")
    End Try

End Sub

' This method handles the LostFocus event for TextBox1 by setting the 
' dialog's InitialDirectory property to the text in TextBox1.
Private Sub TextBox1_LostFocus(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles TextBox1.LostFocus
    OpenFileDialog1.InitialDirectory = TextBox1.Text
End Sub


' This method demonstrates using the ErrorProvider.GetError method 
' to check for an error before opening the dialog box.
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click

    'If there is no error, then open the dialog box.
    If ErrorProvider1.GetError(TextBox1) = "" Then
        Dim dialogResult As DialogResult = OpenFileDialog1.ShowDialog()
    End If

End Sub

설명

호출 하 여 키보드 (TAB, SHIFT + TAB 등)를 사용 하 여 포커스를 변경 하면 합니다 Select 또는 SelectNextControl 메서드를 설정 하거나를 ContainerControl.ActiveControl 속성을 현재 폼에 포커스 이벤트가 다음 순서 대로 발생:When you change the focus by using the keyboard (TAB, SHIFT+TAB, and so on), by calling the Select or SelectNextControl methods, or by setting the ContainerControl.ActiveControl property to the current form, focus events occur in the following order:

  1. Enter

  2. GotFocus

  3. Leave

  4. Validating

  5. Validated

  6. LostFocus

마우스를 사용 하 여 또는 호출 하 여 포커스를 변경 하면를 Focus 메서드 포커스 이벤트가 다음 순서 대로 발생 합니다.When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order:

  1. Enter

  2. GotFocus

  3. LostFocus

  4. Leave

  5. Validating

  6. Validated

경우는 CausesValidation 속성이 falseValidatingValidated 이벤트는 표시 되지 않습니다.If the CausesValidation property is set to false, the Validating and Validated events are suppressed.

경우는 Cancel 의 속성을 CancelEventArgs 로 설정 되어 trueValidating 이벤트 대리자, 후 일반적으로 발생 하는 모든 이벤트는 Validating 이벤트는 표시 되지 않습니다.If the Cancel property of the CancelEventArgs is set to true in the Validating event delegate, all events that would usually occur after the Validating event are suppressed.

참고

GotFocusLostFocus 이벤트는 WM_KILLFOCUS 및 WM_SETFOCUS Windows 메시지에 연결 된 하위 수준 포커스 이벤트입니다.The GotFocus and LostFocus events are low-level focus events that are tied to the WM_KILLFOCUS and WM_SETFOCUS Windows messages. 일반적으로 GotFocusLostFocus 이벤트는 UICues를 업데이트 하거나 사용자 지정 컨트롤을 작성할 때만 사용 됩니다.Typically, the GotFocus and LostFocus events are only used when updating UICues or when writing custom controls. 대신 ActivatedDeactivate 이벤트를 사용 하는 Form 클래스를 제외한 모든 컨트롤에 EnterLeave 이벤트를 사용 해야 합니다.Instead the Enter and Leave events should be used for all controls except the Form class, which uses the Activated and Deactivate events. GotFocusLostFocus 이벤트에 대 한 자세한 내용은 WM_KILLFOCUSWM_KILLFOCUS 항목을 참조 하세요.For more information about the GotFocus and LostFocus events, see the WM_KILLFOCUS and WM_KILLFOCUS topics.

주의

Enter, GotFocus, Leave, LostFocus, Validating또는 Validated 이벤트 처리기 내에서 포커스를 설정 하지 마십시오.Do not attempt to set focus from within the Enter, GotFocus, Leave, LostFocus, Validating, or Validated event handlers. 이렇게 하면 애플리케이션 또는 운영 체제 응답 하지 발생할 수 있습니다.Doing so can cause your application or the operating system to stop responding. 자세한 내용은 WM_KILLFOCUS 항목을 참조 하세요.For more information, see the WM_KILLFOCUS topic.

이벤트 처리에 대한 자세한 내용은 이벤트 처리 및 발생 을 참조하십시오.For more information about handling events, see Handling and Raising Events.

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