ObservableForProperty用于多个Reactive Observable Sequence

Question

我试图ObservableForProperty多个反应观察序列.这是代码.

using ReactiveUI;

public ReactiveUIDerivedClass<T> FName {get; private set;}
public ReactiveUIDerivedClass<T> MName {get; private set;}
public ReactiveUIDerivedClass<T> LName {get; private set;}

FName = new ReactiveUIDerivedClass<T>();
MName = new ReactiveUIDerivedClass<T>();
LName = new ReactiveUIDerivedClass<T>();

这里T是System.String.因此,以下方法有效.

private void ObserveForPropertyInThreeFields()
{
  Observable.CombineLatest(FName.ObservableForProperty(p => p.Value),
                           MName.ObservableForProperty(p => p.Value),
                           LName.ObservableForProperty(p => p.Value))
            .Where(p => p.All(v => !string.IsNullOrWhiteSpace(v.Value)))
            .Subscribe(p => { /* do some stuff */ } );
}

现在,我希望获得类似的结果,其中属性的T有三种不同的类型.当我使用Observable.CombineLatest时,我收到以下错误消息.

无法从用法中推断出方法'System.Reactive.Linq.Observable.CombineLatest(System.IObservable,System.IObservable,System.Func)'的类型参数.尝试显式指定类型参数.

有关ObserveForProperty如何更改不同类型的三个属性的任何想法？

Answer 1

这实际上已经内置于ReactiveUI,使用了一个更好的方法ObservableForProperty,称为WhenAnyValue:

this.WhenAnyValue(x => x.FName, x => x.MName, x => x.LName, 
    (first,middle,last) => new { first, middle, last });