C# Blazor:倒计时计时器

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@page "/"   <h1>Timer</h1>   <p>@counter</p> <button @onclick="StartTimer">Start</button>     @code {     private static System.Timers.Timer aTimer;     private int counter = 60;     public void StartTimer()     {         aTimer = new System.Timers.Timer(1000);         aTimer.Elapsed += CountDownTimer;         aTimer.Enabled = true;     }       public void CountDownTimer(Object source, System.Timers.ElapsedEventArgs e)     {         if (counter > 0)         {             counter -= 1;         }         else         {             aTimer.Enabled = false;             //倒计时结束后需要触发的功能，写在这里         }       InvokeAsync(StateHasChanged);//强制刷新     }   }