开除即忘？

Question

我在 c# wpf mvvm 应用程序中有一个 asyncRelayCommand 不起作用我有点明白我需要一个方法但是我经历的指南没有提到如何制作一个 https://johnthiriet.com/mvvm-going-async-with-async-command/我完成的指南，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这样的作品吗？我真的不明白为什么指南没有提到它，但是是的

Answer 1

真正快速的谷歌搜索：https://www.google.de/search?q=FireAndForgetSafeAsync

=> https://johnthiriet.com/removing-async-void/

public static class TaskUtilities
{

    public static async void FireAndForgetSafeAsync(this Task task, IErrorHandler handler = null)
    {
       try
       {
           await task;
       }
       catch (Exception ex)
       {
           handler?.HandleError(ex);
       }
   }
}

开除即忘？

Fire and forget?

c#

asynchronous

mvvm

icommand