查询Dispatcher队列长度

Question

我正在尝试分析UI线程的用法.是否可以查询调度员排队的物品数量？

更新:克莱门斯的答案是完美的,但是因为我想在UI启动后启动它,我只关心每秒采样一次我使用以下代码...

        int queueLength = 0;
        var currentDispatcher = Dispatcher.CurrentDispatcher;
        currentDispatcher.Hooks.OperationPosted += (s, e) => Interlocked.Increment(ref queueLength);
        currentDispatcher.Hooks.OperationCompleted += (s, e) => Interlocked.Decrement(ref queueLength);
        currentDispatcher.Hooks.OperationAborted += (s, e) => Interlocked.Decrement(ref queueLength);
        Observable
            .Interval(TimeSpan.FromSeconds(1))
            .Subscribe(x =>
                           {
                               int currentQueueLength = queueLength;
                               if (currentQueueLength < 0)
                               {
                                   Interlocked.Add(ref queueLength, currentQueueLength * -1);
                               }
                               UiQueueLength = queueLength;
                           });

Answer 1

Afaik没有属性或方法可以直接请求调度程序队列长度.但是,您可以将处理程序附加到Hooks属性提供的某些DispatcherHooks事件.

var queueLength = 0;
Dispatcher.Hooks.OperationPosted += (o, e) => Interlocked.Increment(ref queueLength);
Dispatcher.Hooks.OperationStarted += (o, e) => Interlocked.Decrement(ref queueLength);
Dispatcher.Hooks.OperationAborted += (o, e) => Interlocked.Decrement(ref queueLength);

如果你只能在调度员是否是活动的兴趣或没有,你可能只是处理OperationPosted事件会同DispatcherInactive.