viewmodel

问题 I am writing a WPF application that has two windows. I have a MainWindowViewModel that holds two more view models: AllTagsViewModel and PlotViewModel . public AllTagsViewModel AllTagsViewModel { get; private set; } public PlotViewModel PlotViewModel { get; private set; } At the moment, I'm using this solution as a click handler in the main window: private void LaunchPlotWindow_OnClick(object sender, RoutedEventArgs e) { if (PlotWindow.GlobalInstanceCount == 0) { PlotWindow plotWindow = new

问题 In my first view model (renamed to MainViewModel) I have a list of ActionViewModels. In my xaml i have a listbox which is bound to the list, in the listbox i have a template which binds to properties from the ActionViewModel. So far so good and everything works. When selecting one of the listitems i navigate to an ActionViewModel and pass the id with it. The ActionViewModel retrieves information from a static list in memory from which the MainViewModel also retrieved the information to create

问题 Please refer to How can I tell my DataTemplate to bind to a property in the PARENT ViewModel? I have similar problem... But this solution didn't work for me. I have a MainViewModel which has an observable collection of another view model say View1/ViewModel1. This view has a tree control and I need context menu for the tree. My main view has a menu. Those main menu and context menu are connected. So how can I bind the context menu commands to the main viewmodel's properties? 回答1: Basically,

问题 When a view model is created you can populate the options (e.g. used in a dropdown list) into a setter property of the view model. The problem is that when that view model is later passed as a parameter (by the framework!) into an action method, those property values has not become automagically repopulated, so if you need to redisplay the form because of validation errors, you need to repopulate those options again. One potential solution, which I am asking for specifically in this question,

问题 We have been discussing about this but we don't know the reason of creating a viewmodel factory to create a viewmodel instead of instantiate the viewmodel directly. What is the gain of creating a factory that just creates the viewmodel? I just put a simple example of how I did it without Factory here is the kodein module: val heroesRepositoryModel = Kodein { bind<HeroesRepository>() with singleton { HeroesRepository() } bind<ApiDataSource>() with singleton { DataModule.create() } bind

问题 A common senario: A model with a collection of item models. E.g a House with a collection of People. How to structure this correctly for MVVM - particulary with regard to updating the Model and ViewModel collections with additions and deletes? Model House contains a collection of model People (normally a List<People> ). View model HouseVM contains the House object that it wraps and an ObservableCollection of view model PeopleVM ( ObservableCollection<PeopleVM> ). Note that we end up here with

问题 This question already has answers here : How can I Have a WPF EventTrigger on a View trigger when the underlying Viewmodel dictates it should? (4 answers) Closed 5 years ago . I have quite simple (I hope :)) problem: In MVVM, View usually listens on changes of ViewModel's properties. However, I would sometimes like to listen on event, so that, for example, View could start animation, or close window, when VM signals. Doing it via bool property with NotifyPropertyChanged (and starting

问题 I just started learning about ViewModels in ASP.NET MVC. So, I thought of implementing a sample example as below: Business Entity public class AddModel { public int a { get; set; } public int b { get; set; } public int Add() { return (this.a + this.b); } } Add ViewModel public class AddViewModel { public AddModel addModel; public int Total { get; set; } } Controller public class AddController : Controller { [HttpPost] public JsonResult Add(AddViewModel model) { int iSum = model.addModel.a +

问题 I just started learning about ViewModels in ASP.NET MVC. So, I thought of implementing a sample example as below: Business Entity public class AddModel { public int a { get; set; } public int b { get; set; } public int Add() { return (this.a + this.b); } } Add ViewModel public class AddViewModel { public AddModel addModel; public int Total { get; set; } } Controller public class AddController : Controller { [HttpPost] public JsonResult Add(AddViewModel model) { int iSum = model.addModel.a +

问题 I'm using Automapper and I have the following scenario: Class OrderModel has a property called 'ProductName' that isn't in the database. So when I try to do the mapping with: Mapper.CreateMap<OrderModel, Orders>(); It generates an exception : "The following 1 properties on Project.ViewModels.OrderModel are not mapped: 'ProductName' I've read at AutoMapper's Wiki for Projections the opposite case (the extra attribute is on the destination, not in the source which is actually my case ) How can