xamarin – 如果我运行每分钟运行的Async方法并从App.Xaml.cs OnStart()调用,是否存在任

我有这个代码,我的意图是,当应用程序打开时,它将运行一个名为PointChecker.CheckPoints()的方法;每一分钟.

此方法与db2.Execute(“UPDATE ….. etc”)同步对我的数据库运行更新;

据我所知,阅读本文：

https://xamarinhelp.com/xamarin-forms-async-task-startup/

我可以通过几种不同的方式实现这一点.

我想知道的是,如果运行这样的代码存在任何性能问题,如果我要以不同的方式运行它,可以减少这些问题.特别是最近有任何Xamarin.Forms工作方式的改变(我的应用程序在iOS和Android上通过Forms运行),我应该考虑,这可能会导致更好的方式来完成这项任务.

public App() {
        InitializeComponent();
        DB.PopulateTables();
        MainPage = new Japanese.MainPage();
    }

    protected override async void OnStart() {
        await Task.Run(() => {
            StartTimer();
        });
    }

    public void StartTimer() {
       if (!stopWatch.IsRunning)
          stopWatch.Start();
          Device.StartTimer(new TimeSpan(0, 0, 1), () => {
             if (stopWatch.IsRunning && stopWatch.Elapsed.Minutes >= 1) {
                PointChecker.CheckPoints();
                stopWatch.Restart();
             }
             return true;
          });
    }
    protected override void OnSleep() {
        stopWatch.Reset(); base.OnSleep();
    }
    protected override void OnResume() {
        base.OnResume(); stopWatch.Start();
    }

最近对Xamarin的更改不应该影响这一点.这种方法是最有效的方法.我唯一要考虑的是为什么你的方法需要异步.你可以打电话：

protected override void OnStart()

在another thread中讨论了一个非UI阻塞的解决方案：

using Xamarin.Forms;
using System;
using System.Linq;
using System.Diagnostics;

namespace YourNamespace
{
    public partial class App : Application
    {
        private static Stopwatch stopWatch = new Stopwatch();
        private const int defaultTimespan = 1;

        protected override void OnStart()
        {
            // On start runs when your application launches from a closed state, 

            if (!StopWatch.IsRunning)
            {
                StopWatch.Start();
            }

            Device.StartTimer(new TimeSpan(0, 0, 1), () =>
            {
                // Logic for logging out if the device is inactive for a period of time.

                if (StopWatch.IsRunning && StopWatch.Elapsed.Minutes >= defaultTimespan)
                {
                    //prepare to perform your data pull here as we have hit the 1 minute mark   

                        // Perform your long running operations here.

                        InvokeOnMainThread(()=>{
                            // If you need to do anything with your UI, you need to wrap it in this.
                        });

                    stopwatch.Restart();
                }

                // Always return true as to keep our device timer running.
                return true;
            });
        }

        protected override void OnSleep()
        {
            // Ensure our stopwatch is reset so the elapsed time is 0.
            StopWatch.Reset();
        }

        protected override void OnResume()
        {
            // App enters the foreground so start our stopwatch again.
            StopWatch.Start();
        }
    }
}

最重要的是,这种方法是

Platform agnostic