[英]How to unit test exceptions from ReactiveCommand (ReactiveUI)?
[英]ReactiveUI: How to cancel an Observable from a ReactiveCommand?
我有以下內容:
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,該方法又在服務類中調用並返回ConvertImages(IEnumerable<ImageDto> images)
,該服務類將調整圖像的大小並壓縮並返回IObservable<ImageDto>
。
Paul Betts建議在此處通過使用IObservable
的實現來實現取消,例如使用Observable.create
,那么有人可以舉例說明如何實現這種Observable嗎?
還有RxUI™發出取消信號的方式是什么? 我應該subscription.Dispose()
在CancelConversion.RegisterAsyncAction()
我應該將.TakeUntil(CancelConversion.Execution_Signaled)
添加到var process
,如何確定“ CancelConversion.Execution_Signaled”?
這很簡單:
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));
處理實際取消(即停止ConvertImages實際所做的任何工作)取決於您對ConvertImages的實現。
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