WPF 介绍一种在MVVM模式下弹出子窗体的方式

主要是通过一个WindowManager管理类,在window后台代码中通过WindowManager注册需要弹出的窗体类型,在ViewModel通过WindowManager的Show方法,显示出来。

WindowManager代码如下:

 public static class WindowManager
    {
        private static Hashtable _RegisterWindow = new Hashtable();

        public static void Regiter<T>(string key)
        {
            _RegisterWindow.Add(key, typeof(T));
        }
        public static void Regiter(string key, Type t)
        {
            if (!_RegisterWindow.ContainsKey(key))
                _RegisterWindow.Add(key, t);
        }

        public static void Remove(string key)
        {
            if (_RegisterWindow.ContainsKey(key))
                _RegisterWindow.Remove(key);
        }

        public static void ShowDialog(string key, object VM)
        {
            if (!_RegisterWindow.ContainsKey(key))
            {
                throw (new Exception("没有注册此键!"));
            }

            var win = (Window)Activator.CreateInstance((Type)_RegisterWindow[key]);
            win.DataContext = VM;
            win.ShowDialog();
        }

    }

做一个扩展方法,将子窗体注册方法扩展到Window类型的对象上。

   public static class WindowExt
    {
        public static void Register(this Window win, string key)
        {
            WindowManager.Regiter(key, win.GetType());
        }

        public static void Register(this Window win,string key,Type t)
        {
            WindowManager.Regiter(key,t);
        }

        public static  void Register<T>(this Window win, string key)
        {
            WindowManager.Regiter<T>(key);
        }
    }

添加一个ViewModelBase,并在类中添加ShowDialog方法,这样所有继承的ViewModel都有这个方法

    public class ViewModelBase
    {
        public void ShowDialog(string key,object vm)
        {
            WindowManager.ShowDialog(key,vm);
        }

        public void ShowMessage(string mes,string title="",MessageBoxButton buttons= MessageBoxButton.OK)
        {
            MessageBox.Show(mes,title,buttons);
        }
    }

添加一个窗体,并注册子窗体, this.Register<Window1>("Window1");

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainWindowViewModel();
            this.Register<Window1>("Window1");
        }
    }

添加ViewModel,继承自ViewModelBase,并在对应的命令中弹出子窗体Window1

    public class MainWindowViewModel:ViewModelBase
    {
        public MainWindowViewModel()
        {
            BtnCommand = new DelegateCommand(ExecuteBtn);
        }

        public DelegateCommand BtnCommand { get; set; }


        private void ExecuteBtn()
        {
            ShowDialog("Window1",this);
        }

    }

这样子窗体就弹出来了。

 

posted @ 2018-09-13 13:36 liuyong111 阅读(...) 评论(...) 编辑 收藏