c# – IObservable.ToTask方法返回等待激活的Task

var task = Observable
    .FromEventPattern<MessageResponseEventArgs>(communicator,"PushMessageRecieved")
    .Where(i => i.EventArgs.GetRequestFromReceivedMessage().Name == requestName)
    .Select(i => i.EventArgs)
    .RunAsync(System.Threading.CancellationToken.None)
    .ToTask();

task.Wait();

我知道“PushMessageRecieved”被解雇了;我可以在Select lambda上设置一个断点并点击它.但task.Wait()永远不会移动.

更好的更新：FirstAsync()是我正在寻找的：

public static Task<MessageResponseEventArgs> HandlePushMessageRecievedAsync(this ICommunicator communicator,RequestName requestName)
    {
        if (communicator == null) return Task.FromResult<MessageResponseEventArgs>(null);

        var observable = GetCommunicatorObservableForPushMessageReceived(communicator);
        return observable
            .Where(i => i.GetRequestFromReceivedMessage().Name == requestName)
            .Select(i => i)
            .FirstAsync()
            .ToTask();
    }

其中GetCommunicatorObservableForPushMessageReceived()是：

static IObservable<MessageResponseEventArgs> GetCommunicatorObservableForPushMessageReceived(ICommunicator communicator)
    {
        if (communicatorObservableForPushMessageReceived == null)
        {
            communicatorObservableForPushMessageReceived = Observable
                .FromEventPattern<MessageResponseEventArgs>(communicator,"PushMessageRecieved")
                .Where(i => !IsPreviousMessage(i.EventArgs.GetRequestFromReceivedMessage().EventId))
                .Select(i => i.EventArgs);
        }

        return communicatorObservableForPushMessageReceived;
    }

更新：这有点可怕(但它确实有效)：

public static Task<MessageResponseEventArgs> HandlePushMessageRecievedAsync(this ICommunicator communicator,RequestName requestName)
{
    if (communicator == null) return Task.FromResult<MessageResponseEventArgs>(null);

    var completionSource = new TaskCompletionSource<MessageResponseEventArgs>();

    Observable
        .FromEventPattern<MessageResponseEventArgs>(communicator,"PushMessageRecieved")
        .Where(i => i.EventArgs.GetRequestFromReceivedMessage().Name == requestName)
        .Select(i => i.EventArgs)
        .ToEvent().OnNext += (args) =>
        {
            if (args.Response.Errors != null && args.Response.Errors.Any())
            {
                completionSource.TrySetException(args.Response.Errors.Select(j => new Exception(j.ErrorMessage)));
            }
            else
            {
                completionSource.TrySetResult(args);
            }
        };

    return completionSource.Task;
}