我在ac＃wpf mvvm应用程序中有一个asyncRelayCommand无法正常工作，我有点理解我需要一种方法，但是我所经历的指南并未提及如何制作一个https://johnthiriet.com/mvvm-going-async-with-async-command/的指南经历了，这是我的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel.Dispatcher;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using GalaSoft.MvvmLight;

namespace DataConverter.Command
{

    public interface IAsyncCommand<T> : ICommand
    {
        Task ExecuteAsync(T parameter);
        bool CanExecute(T parameter);
    }

    public class AsyncCommand<T> : IAsyncCommand<T>
    {
        public event EventHandler CanExecuteChanged;

        private bool _isExecuting;
        private readonly Func<T,Task> _execute;
        private readonly Func<T,bool> _canExecute;
        private readonly IErrorHandler _errorHandler;

        public AsyncCommand(Func<T,Task> execute,Func<T,bool> canExecute = null,IErrorHandler errorHandler = null)
        {
            _execute = execute;
            _canExecute = canExecute;
            _errorHandler = errorHandler;
        }

        public bool CanExecute(T parameter)
        {
            return !_isExecuting && (_canExecute?.Invoke(parameter) ?? true);
        }

        public async Task ExecuteAsync(T parameter)
        {
            if (CanExecute(parameter))
            {
                try
                {
                    _isExecuting = true;
                    await _execute(parameter);
                }
                finally
                {
                    _isExecuting = false;
                }
            }

            RaiseCanExecuteChanged();
        }

        public void RaiseCanExecuteChanged()
        {
            CanExecuteChanged?.Invoke(this,EventArgs.Empty);
        }

        #region Explicit implementations
        bool ICommand.CanExecute(object parameter)
        {
            return CanExecute((T)parameter);
        }

        void ICommand.Execute(object parameter)
        {
            ExecuteAsync((T)parameter).FireAndForgetSafeAsync(_errorHandler);
        }
        #endregion
    }
}

任何人都可以告诉我如何制作一个，这样才能奏效。我真的不明白为什么指南没有提到它，但是是