MVVM模式ViewModel之间的交互及View与ViewModel的关联

概要：
将所有的ViewModel在加载到Application的StaticResource中，然后在View中用标签指定。(StaticResource)
实现：
1)采用特性指定要添加到StaticResource中的对象
public class StaticResourceAttribute : Attribute
    {
        public string Key { get; set; }
        public StaticResourceAttribute(string key)
        {
            this.Key = key;
        }
    }
2)从当前的程序集中，把所有标记了StaticResourceAttribute的ViewModel加载到AppResource中
public class ViewModelManager
    {
        private static Application app = Application.Current;
        public static void InjectViewModelsToResources()
        {
            Assembly executingAssembly = Assembly.GetCallingAssembly();
            foreach (Type type in executingAssembly.GetTypes())
            {
                var attributes = type.GetCustomAttributes(false);
                foreach (var attribute in attributes)
                {
                    if (attribute is StaticResourceAttribute)
                    {
                        var obj = Activator.CreateInstance(type);
                        if (!app.Resources.Contains(type.Name))
                            app.Resources.Add(type.Name, obj);
                    }
                }
            }
        }
        public static T GetViewModelFromResources()
        {
            var key = typeof(T).Name;
            if (app.Resources.Contains(key))
                return (T)app.Resources[key];
            else
                return default(T);
        }
    }
主窗体调用:
public partial class MainPage : UserControl
 
    {
 
        public MainPage()
 
        {
 
            ViewModelManager.InjectViewModelsToResources();
 
               
 
            InitializeComponent();
 
        }
 
    }
View中绑定:
<UserControl x:Class="XXX .LoginView">
 <UserControl.DataContext>
        <Binding Source="{StaticResource LoginViewModel}"/>
    </UserControl.DataContext>
</UserControl>
结论：
　　这样处理后，实现了VM的"单例",多个View关联同一个VM时可以共享数据。
本文来自jianyi的博客，原文地址:http://www.cnblogs.com/jianyi0115/archive/2011/06/08/2074992.html
原文链接：http://www.7fenx.com/between-the-association-and-the-view-and-viewmodel.html