ThreadExceptionEventArgs コンストラクタとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

ThreadExceptionEventArgs コンストラクタ

ThreadExceptionEventArgs クラスの新しいインスタンスを初期化します。

名前空間: System.Threading
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Sub New ( _
    t As Exception _
)

Visual Basic (使用法)

Dim t As Exception

Dim instance As New ThreadExceptionEventArgs(t)

public ThreadExceptionEventArgs (
    Exception t
)

C++

public:
ThreadExceptionEventArgs (
    Exception^ t
)

public ThreadExceptionEventArgs (
    Exception t
)

JScript

public function ThreadExceptionEventArgs (
    t : Exception
)

パラメータ

t: 発生した Exception。

使用例

フォーム上の button1 をクリックすることによって、ThreadException イベントを発生させる例を次に示します。この例では、次の 2 つのクラスを作成します。ErrorHandler クラスは、フォームと、イベントを発生させるボタンを作成します。CustomExceptionHandler クラスは、例外を処理するためのメソッドを提供します。

ErrorHandler クラスの Main では、コードが例外処理クラスの新しいインスタンス (CustomExceptionHandler のインスタンス) を作成します。次に、作成されたインスタンスがイベントに追加され、アプリケーションが実行 (Run) されます。

この例では、CustomExceptionHandler クラスの OnThreadException メソッドで、try...catch...finally ステートメントを使用して例外を処理しています。ShowThreadExceptionDialog メソッドは、表示するメッセージを作成し、そのメッセージをメッセージボックスに表示します。

Visual Basic

' Creates a class to throw the error.
Public Class ErrorHandler
    Inherits System.Windows.Forms.Form    
    
    ' Inserts code to create a form with a button.
    
    ' Programs the button to throw the exception when clicked.
    Private Sub button1_Click(sender As
 Object, e As System.EventArgs)
        Throw New ArgumentException("The
 parameter was invalid")
    End Sub
    
    Public Shared Sub Main()
        ' Creates an instance of the methods that will handle the exception.
        Dim eh As New CustomExceptionHandler()
        
        ' Adds the event handler to to the event.
        AddHandler Application.ThreadException, AddressOf
 eh.OnThreadException
        
        ' Runs the application.
        Application.Run(New ErrorHandler())
    End Sub
    
End Class

' Creates a class to handle the exception event.
Friend Class CustomExceptionHandler
    
    'Handles the exception event
    Public Sub OnThreadException(sender As
 Object, t As ThreadExceptionEventArgs)
        Dim result As DialogResult = DialogResult.Cancel
        Try
            result = Me.ShowThreadExceptionDialog(t.Exception)
        Catch
            Try
                MessageBox.Show("Fatal Error", "Fatal
 Error", _
                    MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop)
            Finally
                Application.Exit()
            End Try
        End Try
        
        ' Exits the program when the user clicks Abort.
        If result = DialogResult.Abort Then
            Application.Exit()
        End If
    End Sub
     
    ' Creates the error message and display it.
    Private Function ShowThreadExceptionDialog(e
 As Exception) As DialogResult
        Dim errorMsg As String
 = "An error occurred please contact the " &
 _
            "adminstrator with the following information:"
 & _
            Microsoft.VisualBasic.ControlChars.Cr & _
            Microsoft.VisualBasic.ControlChars.Cr
        errorMsg &= e.Message & Microsoft.VisualBasic.ControlChars.Cr &
 _
            Microsoft.VisualBasic.ControlChars.Cr & "Stack
 Trace:" & _
            Microsoft.VisualBasic.ControlChars.Cr & e.StackTrace
        Return MessageBox.Show(errorMsg, "Application
 Error", _
            MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop)
    End Function
End Class

// Creates a class to throw the error.
 public class ErrorHandler : System.Windows.Forms.Form
 {
 
    // Inserts code to create a form with a button.
 
    // Programs the button to throw the exception when clicked.
    private void button1_Click(object sender,
 System.EventArgs e) {
       throw new ArgumentException("The parameter was invalid");
    }
 
    public static void Main(string[]
 args) {
       // Creates an instance of the methods that will handle the exception.
       CustomExceptionHandler eh = new CustomExceptionHandler();
 
       // Adds the event handler to to the event.
       Application.ThreadException += new ThreadExceptionEventHandler(eh.OnThreadException);
 
       // Runs the application.
       Application.Run(new ErrorHandler());
    }
 }
 
 // Creates a class to handle the exception event.
 internal class CustomExceptionHandler {
 
    //Handles the exception event
    public void OnThreadException(object sender,
 ThreadExceptionEventArgs t) 
    {
       DialogResult result = DialogResult.Cancel;
       try {
          result = this.ShowThreadExceptionDialog(t.Exception);
       }
       catch {
          try {
             MessageBox.Show("Fatal Error", "Fatal Error", 
                MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
          }
          finally {
             Application.Exit();
          }
       }
 
       // Exits the program when the user clicks Abort.
       if (result == DialogResult.Abort) 
          Application.Exit();
    }
 
    // Creates the error message and display it.
    private DialogResult ShowThreadExceptionDialog(Exception e)
 {
       string errorMsg = "An error occurred please contact
 the adminstrator " +
            "with the following information:\n\n";
       errorMsg = errorMsg + e.Message + "\n\nStack Trace:\n" + e.StackTrace;
       return MessageBox.Show(errorMsg, "Application Error",
 
            MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
    }
 }

C++

// Creates a class to handle the exception event.
private ref class CustomExceptionHandler
{
public:

   //Handles the exception event
   void OnThreadException( Object^ /*sender*/, ThreadExceptionEventArgs^
 t )
   {
      DialogResult result = DialogResult::Cancel;
      try
      {
         result = this->ShowThreadExceptionDialog( t->Exception
 );
      }
      catch ( Exception^ ) 
      {
         try
         {
            MessageBox::Show( "Fatal Error", "Fatal Error", MessageBoxButtons::AbortRetryIgnore,
 MessageBoxIcon::Stop );
         }
         finally
         {
            Application::Exit();
         }

      }

      
      // Exits the program when the user clicks Abort.
      if ( result == DialogResult::Abort )
            Application::Exit();
   }


private:

   // Creates the error message and display it.
   DialogResult ShowThreadExceptionDialog( Exception^ e )
   {
      String^ errorMsg = "An error occurred please contact the adminstrator
 with the following information:\n\n";
      errorMsg = String::Concat( errorMsg, e->Message, "\n\nStack Trace:\n",
 e->StackTrace );
      return MessageBox::Show( errorMsg, "Application Error",
 MessageBoxButtons::AbortRetryIgnore, MessageBoxIcon::Stop );
   }

};


// Creates a class to throw the error.
public ref class ErrorHandler: public
 System::Windows::Forms::Form
{
private:

   // Inserts code to create a form with a button.
   // Programs the button to throw the exception when clicked.
   void button1_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      throw gcnew ArgumentException( "The parameter was invalid" );
   }

};

int main()
{
   
   // Creates an instance of the methods that will handle the exception.
   CustomExceptionHandler^ eh = gcnew CustomExceptionHandler;
   
   // Adds the event handler to to the event.
   Application::ThreadException += gcnew ThreadExceptionEventHandler( eh, &CustomExceptionHandler::OnThreadException
 );
   
   // Runs the application.
   Application::Run( gcnew ErrorHandler );
}