c# –PCL配置文件78中System.Threading.Timer的问题 – 警告

概述令我感到惊讶的是,Profile78库中不存在方便的System.Threading.Timer类.为了使用这个类,我创建了另一个针对4.0框架的PCL,并编写了一个简单的包装器(正如一篇博客文章中所建议的那样)：publicclassPCLTimer{privateTimertimer;privateAction<object>action;

令我感到惊讶的是,Profile 78库中不存在方便的System.Threading.Timer类.为了使用这个类,我创建了另一个针对4.0框架的PCL,并编写了一个简单的包装器(正如一篇博客文章中所建议的那样)：

public class PCLTimer{    private Timer timer;    private Action<object> action;    public PCLTimer (Action<object> action, object state, int dueTimeMilliseconds, int periodMilliseconds)    {        this.action = action;        timer = new Timer (PCLTimerCallback, state, dueTimeMilliseconds, periodMilliseconds);    }    private voID PCLTimerCallback (object state)    {        action.Invoke (state);    }    public bool Change (int dueTimeMilliseconds, int periodMilliseconds)    {        return timer.Change (dueTimeMilliseconds, periodMilliseconds);    }}

现在我可以参考这个4.0库并在主PCL库中使用PCLTimer.但是当我尝试构建我的主要AndroID项目时,我收到以下警告：

Warning CS1684: Reference to type 'System.Threading.Timer' claims it is defined in 'c:\Program files (x86)\Reference AssemblIEs\Microsoft\Framework\.NETPortable\v4.5\Profile\Profile78\mscorlib.dll', but it Could not be found (CS1684) (Prototype.Core)Warning MSB3247: Found conflicts between different versions of the same dependent assembly. (MSB3247) (Prototype.DroID)

如何正确摆脱这些警告？

解决方法:

下面是使用异步任务暂时消失在Profile 78中的Timer类的完全重新实现：

using System;using System.Threading;using System.Threading.Tasks;namespace Quantum{    public delegate voID TimerCallback(object state);    public sealed class Timer : Idisposable    {        private static Task CompletedTask = Task.Fromresult(false);        private TimerCallback Callback;        private Task Delay;        private bool disposed;        private int Period;        private object State;        private CancellationTokenSource TokenSource;        public Timer(TimerCallback callback, object state, int dueTime, int period)        {            Callback = callback;            State = state;            Period = period;            reset(dueTime);        }        public Timer(TimerCallback callback, object state, TimeSpan dueTime, TimeSpan period)            : this(callback, state, (int)dueTime.TotalMilliseconds, (int)period.TotalMilliseconds)        {        }        ~Timer()        {            dispose(false);        }        public voID dispose()        {            dispose(true);            GC.SuppressFinalize(this);        }        private voID dispose(bool cleanUpManagedobjects)        {            if (cleanUpManagedobjects)                Cancel();            disposed = true;        }        public voID Change(int dueTime, int period)        {            Period = period;            reset(dueTime);        }        public voID Change(TimeSpan dueTime, TimeSpan period)        {            Change((int)dueTime.TotalMilliseconds, (int)period.TotalMilliseconds);        }        private voID reset(int due)        {            Cancel();            if (due >= 0)            {                TokenSource = new CancellationTokenSource();                Action tick = null;                tick = () =>                {                    Task.Run(() => Callback(State));                    if (!disposed && Period >= 0)                    {                        if (Period > 0)                            Delay = Task.Delay(Period, TokenSource.Token);                        else                            Delay = CompletedTask;                        Delay.ContinueWith(t => tick(), TokenSource.Token);                    }                };                if (due > 0)                    Delay = Task.Delay(due, TokenSource.Token);                else                    Delay = CompletedTask;                Delay.ContinueWith(t => tick(), TokenSource.Token);            }        }        private voID Cancel()        {            if (TokenSource != null)            {                TokenSource.Cancel();                TokenSource.dispose();                TokenSource = null;            }        }    }}

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