ReactiveUI：如何从ReactiveCommand中取消Observable？

Question

我有以下内容：

Compress = this.WhenAnyValue(x => x.ImagesCount, x => x > 0).ToCommand();
var process = Compress.RegisterAsync(ConvertImages);
var subscription = process.Subscribe(x => Images.Remove(x));

CancelConversion = this.WhenAnyValue(x => x.ImagesCount, x => x.IsBusy, (count, busy) => count > 0 && busy).ToCommand();
CancelConversion.RegisterAsyncAction();

其中ConvertImages(object o)是ViewModel的私有方法，反过来调用并在服务类中返回ConvertImages(IEnumerable<ImageDto> images)的结果，该服务类调整大小并压缩图像并返回IObservable<ImageDto>

Paul Betts建议here通过实施IObservable来实施取消，例如使用Observable.create，任何人都可以提供一个如何实现这样的Observable的例子吗？

RxUI™发出此取消信号的方式是什么？ subscription.Dispose()我应该CancelConversion.RegisterAsyncAction()吗？我应该将.TakeUntil(CancelConversion.Execution_Signaled)添加到var process，如何确定“CancelConversion.Execution_Signaled”？

Answer 1

这很简单：

CancelConversion = this.WhenAnyValue(x => x.ImagesCount, x => x.IsBusy, (count, busy) => count > 0 && busy).ToCommand();

this.WhenAnyValue(x => x.ImagesCount, x => x > 0).ToCommand();

var process = Compress.RegisterAsync(x => ConvertImages().TakeUntil(CancelConversion));
var subscription = process.Subscribe(x => Images.Remove(x));

处理实际取消（即停止ConvertImages正在做的任何工作）取决于您对ConvertImages的实现。