ReactiveList和WhenAny

Question

我公司拥有一批在举行核对清单的ReactiveLists有ChangeTrackingEnabled = true.我想只在每个列表中至少检查一个项目时启用我的OkCommand.

此外,还有各种其他属性需要确保使用有效的字节值填充.

我尝试过以下操作,但它不起作用:

        this.OkCommand = new ReactiveCommand(this.WhenAny(
            x => x.Property1,
            x => x.Property1,
            x => x.Property1,
            x => x.List1,
            x => x.List2,
            x => x.List3,
            (p1, p2, p3, l1, l2, l3) =>
            {
                byte tmp;
                return byte.TryParse(p1.Value, out tmp) &&
                       byte.TryParse(p2.Value, out tmp) &&
                       byte.TryParse(p3.Value, out tmp) &&
                       l1.Value.Any(x => x.IsChecked) &&
                       l2.Value.Any(x => x.IsChecked) &&
                       l3.Value.Any(x => x.IsChecked);
            }));

似乎属性更改通知未传播到WhenAny.知道我应该做什么吗？

Answer 1

这是在有人设置列表时进行测试,即:

this.List1 = new ReactiveList<Foo>();

相反,你需要这样的东西:

this.WhenAnyObservable(x => x.List1.ItemChanged, x => x.List2.ItemChanged)
    .Where(x => x.PropertyName == "IsChecked")
    .Select(_ => List1.Any(x => x.IsChecked) && List2.Any(x => x.IsChecked));