MvvmVision/MvvmScaffoldFrame48.VIEWMODEL/ViewModel/RelayComand.cs

// 事件传递类，用于传递界面的事件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace MvvmScaffoldFrame48.ViewModel.ViewModel
{
    public class RelayCommand : ICommand
    {

        public event EventHandler CanExecuteChanged;

        private Action<object> _Excute { get; set; }

        private Predicate<object> _CanExcute { get; set; }

        public RelayCommand(Action<object> ExcuteMethod, Predicate<object> CanExcuteMethod)
        {
            _Excute = ExcuteMethod;
            _CanExcute = CanExcuteMethod;
        }

        public bool CanExecute(object parameter)
        {
            return _CanExcute(parameter);
        }

        public void Execute(object parameter)
        {
            _Excute(parameter);
        }
    }

    public class RelayCommand<T> : ICommand
    {
        private readonly Action<T> _execute;
        private readonly Predicate<T> _canExecute;

        // 定义 CanExecuteChanged 事件
        public event EventHandler CanExecuteChanged;

        public RelayCommand(Action<T> execute, Predicate<T> canExecute = null)
        {
            _execute = execute ?? throw new ArgumentNullException(nameof(execute));
            _canExecute = canExecute;
        }

        // 判断命令是否可以执行
        public bool CanExecute(object parameter)
        {
            return _canExecute == null || _canExecute((T)parameter);
        }

        // 执行命令逻辑
        public void Execute(object parameter)
        {
            _execute((T)parameter);
        }

        // 手动触发 CanExecuteChanged 事件（用于通知 UI 刷新命令状态）
        public void RaiseCanExecuteChanged()
        {
            CanExecuteChanged?.Invoke(this, EventArgs.Empty);
        }
    }
}