PCL .NET 4.5 计时器 [英] PCL .NET 4.5 Timer
问题描述
我正在使用 Xamarin 和 MvvmCross 构建跨平台应用程序.我需要每分钟调用服务器进行更新(稍后我将转向推送通知),但我无法在我的核心项目中设置计时器.我见过 MvvmCross N+42 但我相信目标项目更旧,它允许计时器.下面是我的目标框架.
I am building cross platform apps with Xamarin and MvvmCross. I need to call the server to the updates every minute (I will move to push notifications later) but I am unable to make a timer in my Core Project. I've seen MvvmCross N+42 but I believe the target projects are older which allows the timer. Below is my target framework.
有没有更好的方法让我不断调用调用服务的方法?
Is there a better way for me to constantly call a method which calls a service?
- .NET Framework 4.5 及更高版本
- Windows 应用商店应用 (Windows 8) 及更高版本
- Windows Phone 8
- Xamarin.Android
- Xamarin.iOS
推荐答案
@stevemorgan 的回答非常有效.我基于该代码创建了一个 Timer 实用程序,以使其更具可重用性.我还添加了一个runOnce"参数,它将在第一个滴答后停止计时器
@stevemorgan answer works really well. I created a Timer utility based on that code to make it more reusable. I also added a "runOnce" parameter that will stop the timer after the first tick
public class PclTimer
{
public bool IsRunning { get; private set; }
public TimeSpan Interval { get; set; }
public Action Tick { get; set; }
public bool RunOnce { get; set; }
public Action Stopped { get; set; }
public Action Started { get; set; }
public PclTimer(TimeSpan interval, Action tick = null, bool runOnce = false)
{
Interval = interval;
Tick = tick;
RunOnce = runOnce;
}
public PclTimer Start()
{
if (!IsRunning)
{
IsRunning = true;
Started?.Invoke();
var t = RunTimer();
}
return this;
}
public void Stop()
{
IsRunning = false;
Stopped?.Invoke();
}
private async Task RunTimer()
{
while (IsRunning)
{
await Task.Delay(Interval);
if (IsRunning)
{
Tick?.Invoke();
if (RunOnce)
{
Stop();
}
}
}
}
}
我在 MvvmCross 中使用它没有任何问题:
I´m using this in MvvmCross with no issues:
timer = new Timer(TimeSpan.FromSeconds(4),
() => ShowViewModel<UserMatchViewModel>(), true)
.Start();
这篇关于PCL .NET 4.5 计时器的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!