스레드 타이머(C# 및 Visual Basic)

System.Threading.Timer 클래스는 작업을 별도의 스레드에서 정기적으로 실행하는 데 유용합니다. 예를 들어, 데이터베이스의 상태 및 무결성을 검사하거나 중요한 파일을 백업할 때 스레드 타이머를 사용할 수 있습니다.

스레드 타이머 예제

다음 예제에서는 2초마다 작업을 시작하고 플래그를 사용하여 타이머를 중지하는 Dispose 메서드를 시작합니다. 이 예제에서는 출력 창에 상태를 게시합니다.

Private Class StateObjClass
    ' Used to hold parameters for calls to TimerTask.
    Public SomeValue As Integer
    Public TimerReference As System.Threading.Timer
    Public TimerCanceled As Boolean
End Class

Public Sub RunTimer()
    Dim StateObj As New StateObjClass
    StateObj.TimerCanceled = False
    StateObj.SomeValue = 1
    Dim TimerDelegate As New System.Threading.TimerCallback(AddressOf TimerTask)
    ' Create a timer that calls a procedure every 2 seconds.
    ' Note: There is no Start method; the timer starts running as soon as 
    ' the instance is created.
    Dim TimerItem As New System.Threading.Timer(TimerDelegate, StateObj,
                                                2000, 2000)
    ' Save a reference for Dispose.
    StateObj.TimerReference = TimerItem

    ' Run for ten loops.
    While StateObj.SomeValue < 10
        ' Wait one second.
        System.Threading.Thread.Sleep(1000)
    End While

    ' Request Dispose of the timer object.
    StateObj.TimerCanceled = True
End Sub

Private Sub TimerTask(ByVal StateObj As Object)
    Dim State As StateObjClass = CType(StateObj, StateObjClass)
    ' Use the interlocked class to increment the counter variable.
    System.Threading.Interlocked.Increment(State.SomeValue)
    System.Diagnostics.Debug.WriteLine("Launched new thread  " & Now.ToString)
    If State.TimerCanceled Then
        ' Dispose Requested.
        State.TimerReference.Dispose()
        System.Diagnostics.Debug.WriteLine("Done  " & Now)
    End If
End Sub

private class StateObjClass
{
    // Used to hold parameters for calls to TimerTask.
    public int SomeValue;
    public System.Threading.Timer TimerReference;
    public bool TimerCanceled;
}

public void RunTimer()
{
    StateObjClass StateObj = new StateObjClass();
    StateObj.TimerCanceled = false;
    StateObj.SomeValue = 1;
    System.Threading.TimerCallback TimerDelegate =
        new System.Threading.TimerCallback(TimerTask);

    // Create a timer that calls a procedure every 2 seconds.
    // Note: There is no Start method; the timer starts running as soon as 
    // the instance is created.
    System.Threading.Timer TimerItem =
        new System.Threading.Timer(TimerDelegate, StateObj, 2000, 2000);

    // Save a reference for Dispose.
    StateObj.TimerReference = TimerItem;  

    // Run for ten loops.
    while (StateObj.SomeValue < 10) 
    {
        // Wait one second.
        System.Threading.Thread.Sleep(1000);  
    }

    // Request Dispose of the timer object.
    StateObj.TimerCanceled = true;  
}

private void TimerTask(object StateObj)
{
    StateObjClass State = (StateObjClass)StateObj;
    // Use the interlocked class to increment the counter variable.
    System.Threading.Interlocked.Increment(ref State.SomeValue);
    System.Diagnostics.Debug.WriteLine("Launched new thread  " + DateTime.Now.ToString());
    if (State.TimerCanceled)    
    // Dispose Requested.
    {
        State.TimerReference.Dispose();
        System.Diagnostics.Debug.WriteLine("Done  " + DateTime.Now.ToString());
    }
}

스레드 타이머는 콘솔 응용 프로그램을 개발할 때와 같이 System.Windows.Forms.Timer 개체를 사용할 수 없는 경우에 특히 유용합니다.

참고 항목

참조

System.Threading

개념

다중 스레드 응용 프로그램(C# 및 Visual Basic)