WPF MVVM Command的简单使用_wpf 中commandbase 这个方法在哪个库里

1 新建wpf应用

2 新建Views,Models,ViewModels文件夹

3 新建Base文件夹，并在其里面新建CommandBase类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
 
namespace WpfApp1.Base
{
    public class CommandBase : ICommand
    {
        public event EventHandler CanExecuteChanged;
 
        public bool CanExecute(object parameter)
        {
            return true;
        }
 
        public void Execute(object parameter)
        {
            DoExecute?.Invoke();
        }
 
        public Action DoExecute { get; set; }
 
 
        public CommandBase(Action doExecute)
        {
            this.DoExecute = doExecute;
        }
    }
}

3 在ViewModels里面新建MainViewModels类，并在其里面新建MainViewModel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using WpfApp1.Base;
using WpfApp1.Models;
 
namespace WpfApp1.ViewModels
{
    public class MainViewModel
    {
 
        public ICommand btnCommand { get; set; }
 
 
        public MainViewModel()
        {
            btnCommand = new CommandBase(() =>
            {
 
            });
        }
    }
}

这里面指定命令执行的委托

4 在MainWindow.xaml中添加Button，并设置Command属性

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        xmlns:vm="clr-namespace:WpfApp1.ViewModels"
        mc:Ignorable="d" FontSize="30"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <vm:MainViewModel />
    </Window.DataContext>
    <Grid>
        <Button Content="test" Command="{Binding btnCommand}" />
    </Grid>
</Window>

5 运行执行