1

public class HomeController : Controller
{
    /// <summary>
    /// ContinueWith的使用：
    /// </summary>
    /// <returns></returns>
    public ActionResult Index()
    {
        GetVal(6, 0); //0是不能作為被除數的，所以會引發錯誤
        return View();
    }
    private int Sum(int x, int y)
    {
        return x / y;
    }
    public void GetVal(int x, int y)
    {
        Task<string> t = Task.Run<string>(() => { return Sum(x, y).ToString(); });
        try
        {
            t.Wait();
        }
        catch (AggregateException exs)//表示在應用程式執行期間發生的一個或多個錯誤。
        {
            foreach (var ex in exs.InnerExceptions)
            {
                var errorA = ex.GetBaseException().Message;
                
            }
        }
                        
        //t.ContinueWith(r => { WriteLog("異常資訊：" + t.Exception.GetBaseException().GetType().Name); }, TaskContinuationOptions.OnlyOnFaulted); 
       
    }
    static void WriteLog(string logStr)
    {
        System.IO.File.AppendAllText(@"D:\Log.txt", logStr + "\r\n");
    }
}