回答編集履歴
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見直しキャンペーン中
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検索すると`ReactiveCommand`にする例が多いですが、`ToReactiveCommand`するか`ToReactiveProperty`するか程度の違いです。
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コマンドの場合はエラーがないときに実行したいですから、判定は逆になることが多いですね。
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using Reactive.Bindings;
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using System;
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using System.ComponentModel.DataAnnotations;
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using System.Linq;
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using System.Reactive.Linq;
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namespace Questions357340
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{
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class ViewModel
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{
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[Required] public ReactiveProperty<string> A { get; }
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[Range(1, 10)] public ReactiveProperty<int> B { get; }
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public ReadOnlyReactiveProperty<bool> AnyErrors { get; }
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public bool AnyErrorsField;
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public ViewModel()
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{
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A = new ReactiveProperty<string>().SetValidateAttribute(() => A);
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B = new ReactiveProperty<int>().SetValidateAttribute(() => B);
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IObservable<bool>[] errors = { A.ObserveHasErrors, B.ObserveHasErrors, };
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AnyErrors = errors.CombineLatest(x => x.Any(y => y)).ToReadOnlyReactiveProperty();
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//AnyErrors = errors.CombineLatestValuesAreAllFalse().Inverse().ToReadOnlyReactiveProperty();
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errors.CombineLatest(x => x.Any(y => y)).Subscribe(x => AnyErrorsField = x); // 後始末省略
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AnyErrorsField = AnyErrors.Value; // 初期値は知りようがないのでセット
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}
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}
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class Program
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{
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static void Main()
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{
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var vm = new ViewModel();
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Console.WriteLine($"A.HasErrors:{vm.A.HasErrors}, B.HasErrors:{vm.B.HasErrors}, AnyErrors:{vm.AnyErrors.Value}, AnyErrorsField:{vm.AnyErrorsField}");
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vm.A.Value = "hoge";
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Console.WriteLine($"A.HasErrors:{vm.A.HasErrors}, B.HasErrors:{vm.B.HasErrors}, AnyErrors:{vm.AnyErrors.Value}, AnyErrorsField:{vm.AnyErrorsField}");
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vm.B.Value = 1;
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Console.WriteLine($"A.HasErrors:{vm.A.HasErrors}, B.HasErrors:{vm.B.HasErrors}, AnyErrors:{vm.AnyErrors.Value}, AnyErrorsField:{vm.AnyErrorsField}");
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}
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}
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}
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```
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```
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A.HasErrors:True, B.HasErrors:True, AnyErrors:True, AnyErrorsField:True
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A.HasErrors:False, B.HasErrors:True, AnyErrors:True, AnyErrorsField:True
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A.HasErrors:False, B.HasErrors:False, AnyErrors:False, AnyErrorsField:False
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1
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検索すると`ReactiveCommand`にする例が多いですが、`ToReactiveCommand`するか`ToReactiveProperty`するか程度の違いです。
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2
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コマンドの場合はエラーがないときに実行したいですから、判定は逆になることが多いですね。
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3
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4
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```cs
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using Reactive.Bindings;
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using System;
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8
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using System.ComponentModel.DataAnnotations;
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9
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using System.Linq;
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10
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using System.Reactive.Linq;
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11
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namespace Questions357340
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13
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{
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14
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class ViewModel
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15
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{
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16
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[Required] public ReactiveProperty<string> A { get; }
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[Range(1, 10)] public ReactiveProperty<int> B { get; }
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public ReadOnlyReactiveProperty<bool> AnyErrors { get; }
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public bool AnyErrorsField;
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public ViewModel()
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{
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A = new ReactiveProperty<string>().SetValidateAttribute(() => A);
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B = new ReactiveProperty<int>().SetValidateAttribute(() => B);
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IObservable<bool>[] errors = { A.ObserveHasErrors, B.ObserveHasErrors, };
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AnyErrors = errors.CombineLatest(x => x.Any(y => y)).ToReadOnlyReactiveProperty();
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//AnyErrors = errors.CombineLatestValuesAreAllFalse().Inverse().ToReadOnlyReactiveProperty();
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errors.CombineLatest(x => x.Any(y => y)).Subscribe(x => AnyErrorsField = x); // 後始末省略
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AnyErrorsField = AnyErrors.Value; // 初期値は知りようがないのでセット
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}
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}
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class Program
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{
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static void Main()
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{
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var vm = new ViewModel();
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Console.WriteLine($"A.HasErrors:{vm.A.HasErrors}, B.HasErrors:{vm.B.HasErrors}, AnyErrors:{vm.AnyErrors.Value}, AnyErrorsField:{vm.AnyErrorsField}");
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vm.A.Value = "hoge";
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Console.WriteLine($"A.HasErrors:{vm.A.HasErrors}, B.HasErrors:{vm.B.HasErrors}, AnyErrors:{vm.AnyErrors.Value}, AnyErrorsField:{vm.AnyErrorsField}");
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vm.B.Value = 1;
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Console.WriteLine($"A.HasErrors:{vm.A.HasErrors}, B.HasErrors:{vm.B.HasErrors}, AnyErrors:{vm.AnyErrors.Value}, AnyErrorsField:{vm.AnyErrorsField}");
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}
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}
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}
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```
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```
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53
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A.HasErrors:True, B.HasErrors:True, AnyErrors:True, AnyErrorsField:True
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A.HasErrors:False, B.HasErrors:True, AnyErrors:True, AnyErrorsField:True
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A.HasErrors:False, B.HasErrors:False, AnyErrors:False, AnyErrorsField:False
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```
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