AsyncReactiveProperty が実行中かどうかを判定

using Reactive.Bindings;
using System.Reactive.Subjects;

var isNotRunning = new ReactivePropertySlim<bool>(true);

var canExecuteSource = new Subject<bool>();

var command = canExecuteSource.ToAsyncReactiveCommand(
    isNotRunning)
    .WithSubscribe(async () =>
    {
        Console.WriteLine("Executing....");
        await Task.Delay(5000);
        Console.WriteLine("Executed!");
    });

Console.WriteLine($"CanExecute: {command.CanExecute()}"); // canExecuteSource が false なので false
canExecuteSource.OnNext(true);
Console.WriteLine($"CanExecute: {command.CanExecute()}"); // canExecuteSource が true で isNotRunning が true なので true

var commandTask = command.ExecuteAsync();
await Task.Delay(1000);
Console.WriteLine($"IsNotRunning: {isNotRunning.Value}"); // 実行中なので false

await commandTask;
Console.WriteLine($"IsNotRunning: {isNotRunning.Value}"); // 実行完了なので true