我有这个代码每次另一个属性更改时生成“计算”或“输出”属性。派生属性是正确生成的,但由于CreateBlurImage
有点长时间运行,因此UI在运行时会被冻结。
获得相同的最终结果的正确方法是什么,但是异步?
编辑这是我的代码的当前版本,经过@Shane的一些建议,但仍然保持冻结的UI,直到所有处理完成。请注意,如果重要的话,还有一些级联更新:
public ColetaIsis Model { get; private set; }
public string NomePaciente { get { return Model?.NomePaciente; } }
public DateTime DataRealização { get { return Model.DataRealização; } }
public BitmapSource Listras
{
get { return _listras; }
set { this.RaiseAndSetIfChanged(ref _listras, value); }
}
BitmapSource _listras;
public double[,] Grayscale { get { return _grayscale.Value; } }
readonly ObservableAsPropertyHelper<double[,]> _grayscale;
public double[,] BlurMenor { get { return _blurMenor.Value; } }
readonly ObservableAsPropertyHelper<double[,]> _blurMenor;
public double[,] BlurMaior { get { return _blurMaior.Value; } }
readonly ObservableAsPropertyHelper<double[,]> _blurMaior;
public double[,] Diferença { get { return _diferença.Value; } }
readonly ObservableAsPropertyHelper<double[,]> _diferença;
public BitmapSource FiltradaMenor { get { return _filtradaMenor?.Value; } }
readonly ObservableAsPropertyHelper<BitmapSource> _filtradaMenor;
public BitmapSource FiltradaMaior { get { return _filtradaMaior?.Value; } }
readonly ObservableAsPropertyHelper<BitmapSource> _filtradaMaior;
public BitmapSource ImagemDiferença { get { return _imagemDiferença?.Value; } }
readonly ObservableAsPropertyHelper<BitmapSource> _imagemDiferença;
public IEnumerable<ScatterPoint> Picos => _picos;
IEnumerable<ScatterPoint> _picos;
// CONSTRUTOR
public ColetaIsisViewModel(ColetaIsis model)
{
this.WhenAnyValue(x => x.Listras)
.Where(item => item != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(im => GetArray.FromChannels(im, 0, 1))
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.Grayscale, out _grayscale, scheduler:RxApp.MainThreadScheduler);
this.WhenAnyValue(x => x.Grayscale)
.Where(item => item != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(ar => Gaussian.GaussianConvolution(ar, 1.5))
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.BlurMenor, out _blurMenor, scheduler: RxApp.MainThreadScheduler);
this.WhenAnyValue(x => x.BlurMenor)
.Where(item => item != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(ar => Gaussian.VerticalGaussianConvolution(ar, 5))
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.BlurMaior, out _blurMaior, scheduler: RxApp.MainThreadScheduler);
this.WhenAnyValue(x => x.BlurMenor, x => x.BlurMaior)
.Where(tuple => tuple.Item1 != null && tuple.Item2 != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(tuple => ArrayOperations.Diferença(tuple.Item1, tuple.Item2))
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.Diferença, out _diferença, scheduler: RxApp.MainThreadScheduler);
this.WhenAnyValue(x => x.BlurMenor)
.Where(item => item != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(ar => { ConversorImagem.Converter(ar, out BitmapSource im); return im; })
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.FiltradaMenor, out _filtradaMenor, scheduler: RxApp.MainThreadScheduler);
this.WhenAnyValue(x => x.BlurMaior)
.Where(item => item != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(ar => { ConversorImagem.Converter(ar, out BitmapSource im); return im; })
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.FiltradaMaior, out _filtradaMaior, scheduler: RxApp.MainThreadScheduler);
this.WhenAnyValue(x => x.Diferença)
.Where(item => item != null)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(ar => { ConversorImagem.Converter(ar, out BitmapSource im); return im; })
//.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.ImagemDiferença, out _imagemDiferença, scheduler: RxApp.MainThreadScheduler);
Model = model;
Listras = Model.Listras; // fires up the initial cascading updates
}
答案 0 :(得分:3)
这些方法中的任何一种都有效吗?这样CreateBlurImage部分就完成了UIThread
String
或者我非常确定在ToProperty上指定调度程序将与上面相同
public MyClass()
{
this.WhenAnyValue(x => x.StripedImage)
.ObserveOn(RxApp.TaskpoolScheduler)
.Select(im => CreateBlurImage(im))
.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.Filtered, out _filtered);
}