我有我的MainWindow加载新的UserControls和ViewModel到它的ContentControl,所以视图切换。访问属性在ContentControl的父视图模型
但是,我需要从ContentControl中的ViewModel访问我的MainWindow ViewModel中的属性。
MainWindowViewModel
namespace PhotoManagement
{
public class MainWindowViewModel : NotifyUIBase
{
public ObservableCollection<ViewVM> Views { get; set; }
private ObservableCollection<Logged> loggedUsers;
public ObservableCollection<Logged> LoggedUsers
{
get
{
return loggedUsers;
}
set
{
loggedUsers.Add(value[0]);
//There is a user logged in, switch to home and display menu
if (loggedUsers.Count > 0)
{
//Display menu, switch Windows
MessageBox.Show("Someone is logged in!");
}
else
{
MessageBox.Show("No-one is logged in!");
}
}
}
下面你可以看到LoginViewModel这是在主窗口ContentControl中,我已经加入其中,我想要这个新的用户添加到的ObservableCollection评论。
#region Login Methods
private LoginVM loginVM;
public LoginVM LoginVM
{
get
{
return loginVM;
}
set
{
loginVM = value;
editEntity = editVM.TheEntity;
RaisePropertyChanged();
}
}
protected override void DoLogin()
{
//Check if email exists
var exist = db.Users.Count(a => a.Email == LoginVM.TheEntity.Email);
if (exist != 0)
{
//Fecth user details
var query = db.Users.First(a => a.Email == LoginVM.TheEntity.Email);
if (Common.Security.HashGenerator.CalculateHash(LoginVM.TheEntity.ClearPassword, query.Salt) == query.Hash)
{
//Password is correct
MessageBox.Show("Details correct!");
//Set properties
LoginVM.TheEntity.FirstName = query.FirstName;
LoginVM.TheEntity.LastName = query.LastName;
LoginVM.TheEntity.UID = query.UID;
//Add the LoginVM to LoggedUsers
编辑: 这是我补充的意见,MainWindowViewModel
namespace PhotoManagement
{
public class MainWindowViewModel : NotifyUIBase
{
public ObservableCollection<ViewVM> Views { get; set; }
private ObservableCollection<Logged> loggedUsers;
public ObservableCollection<Logged> LoggedUsers
{
get
{
return loggedUsers;
}
set
{
loggedUsers.Add(value[0]);
//There is a user logged in, switch to home and display menu
if (loggedUsers.Count > 0)
{
//Display menu, switch Windows
MessageBox.Show("Someone is logged in!");
}
else
{
MessageBox.Show("No-one is logged in!");
}
}
}
public string Version
{
get { return System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString(); }
}
public MainWindowViewModel()
{
ObservableCollection<ViewVM> views = new ObservableCollection<ViewVM>
{
new ViewVM { IconGeometry=App.Current.Resources["home4"] as Geometry, ViewDisplay="Home", ViewType = typeof(LoginView), ViewModelType = typeof(LoginViewModel)},
new ViewVM { IconGeometry=App.Current.Resources["instagram3"] as Geometry, ViewDisplay="Images", ViewType = typeof(LoginView), ViewModelType = typeof(LoginView)},
new ViewVM { IconGeometry=App.Current.Resources["money674"] as Geometry, ViewDisplay="Sales", ViewType = typeof(LoginView), ViewModelType = typeof(LoginViewModel)},
new ViewVM { IconGeometry=App.Current.Resources["printing1"] as Geometry, ViewDisplay="Print Queue", ViewType = typeof(LoginView), ViewModelType = typeof(LoginViewModel)},
new ViewVM { IconGeometry=App.Current.Resources["cog2"] as Geometry, ViewDisplay="Settings", ViewType = typeof(IconLibaryView), ViewModelType = typeof(IconLibaryViewModel)},
new ViewVM { IconGeometry=App.Current.Resources["upload40"] as Geometry, ViewDisplay="Upload", ViewType = typeof(IconLibaryView), ViewModelType = typeof(IconLibaryViewModel)}
};
Views = views;
RaisePropertyChanged("Views");
views[0].NavigateExecute();
}
}
}
当'MainWindowViewModel'创建'LoginVM'添加到'Views'集合时,它应该给它一个属性或委托,以便它可以设置当前登录的用户。如果'MainWindowViewModel'和'LoginVM'完全不连接,则可以使用消息传递系统,例如MVVM Light的'Messenger'或Microsoft Prism的'EventAggregator'。 – Rachel
@Rachel,我在添加视图的地方添加了代码,你能否解释一下你的意思,当你说它应该给它一个属性时,我可以设置用户。以前没有尝试过使用'Messenger',必须仔细查看它。 –
在您的ViewModel中加载UserControls? Noooooooooooooooo0ope。您应该使用绑定到您的视图模型和模型的ContentControls和ItemsControls,以及包含与每个模型匹配的UI的DataTemplates。这不是MVVM,它是旧代码隐藏和MVVM之间的一种混合。 – Will