具有IsExecuting属性的ReactiveUI连通可观测CanExecute

using System;
using System.Reactive.Linq;
using ReactiveUI;

public class MyViewModel : ReactiveObject
{
    private readonly ReactiveCommand<Unit, Unit> _myCommand;
    public bool IsExecuting => _myCommand.IsExecuting;

    public MyViewModel()
    {
        // 创建一个命令，该命令在执行时会模拟一个耗时操作
        _myCommand = ReactiveCommand.CreateFromTask(async () =>
        {
            await Task.Delay(2000); // 模拟耗时操作
        });

        // 设置 CanExecute，这里简单地检查 IsExecuting 状态
        _myCommand.CanExecuteObservable
            .Subscribe(canExecute =>
            {
                // 更新 UI，例如禁用/启用按钮
                Console.WriteLine($"Can execute: {canExecute}");
            });

        // 订阅命令的执行结果
        _myCommand.Subscribe(_ =>
        {
            Console.WriteLine("Command executed.");
        });
    }

    public void ExecuteCommand()
    {
        _myCommand.Execute(Unit.Default);
    }
}

// 示例：改进后的 CanExecute 设置
this.WhenAnyValue(x => x.IsExecuting)
    .Select(isExecuting => !isExecuting)
    .BindTo(this, x => x.MyButtonEnabled)
    .Subscribe();