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Why separate Model from ViewModel?
The ViewModel is a model of your data from the UI’s standpoint. One more important point is that it is not necessary that you would display each and every column of the table in your database on the UI. So by having a Model the VM would only get the relevant data which is necessary for the end user on the UI.
Where do I put ViewModels?
3 Answers. Just create a new folder called ViewModels inside your project. So that along with the Views, Controllers and Models folders, you’ll also have ViewModels. Like you already said, you talk to your DAL using your models and you talk to your views using your view models.
What is the benefit of MVVM?
MVVM cleanly separates the user interface from the application logic. Divorcing one from the other improves application maintenance. It also makes application evolution easier, thereby reducing the risk of technological obsolescence. Eliminates the need for application redesign – User interfaces become outdated.
What is meant by separating model and view?
In a software product there are two distinct modules whose responsibilities are well-defined and should be clearly demarcated. The model is a software representation of a solution to a known problem whereas the view allows the user to interact with the model to solve a specific problem.
Should ViewModel know about model?
Models are just the plain data, and a ViewModel is something that acts like a padding in between the two, that it should get information from the Model and pass it onto the View, and the View should know how to present it.
How can we use two models in single view in MVC?
Here I will explain ways one by one.
- Using Dynamic Model. ExpandoObject (the System.
- Using View Model. ViewModel is nothing but a single class that may have multiple models.
- Using ViewData. ViewData is used to transfer data from the controller to the view.
- Using ViewBag.
- Using Tuple.
- Using Render Action Method.
What is a ViewModel MVC?
In ASP.NET MVC, ViewModel is a class that contains the fields which are represented in the strongly-typed view. It is used to pass data from controller to strongly-typed view.
When should you use MVVM?
Why You Should Use MVVM for Small Apps
- Your code is easier to understand, maintain and troubleshoot.
- You are much more productive when you leverage the frameworks’ (WPF, Silverlight, XAML, WinRT) built-in features like Data Binding, Resource Dictionaries, Dependency Properties, Routed Events, Commands, etc.
What does it mean to separate models and viewmodels?
This means the ViewModel is specific to your need and although you may have a slight class explosion and duplication you can be confident when changing one viewModel you will not effect anything else in the project.
How to separate model and view in C #?
At first I was just creating very similar DTOs for the models to use as presentation models. Something like this: However, that doesn’t make sense for every view situation. A Create action, for example, shouldn’t have an ID property. A Delete action doesn’t need all of that information. And so on.
How does view and ViewModel should communicate?
Rule Number One: View should not have any logic in it, not at all! Not even a simple if condition. All logic for the view happens in ViewModel. Rule Number Two: In response to events view does nothing except notifying view-model by calling a method. View does not pass any view related classes to view model.
How to separate data model from Presentation Class?
The only code these classes usually contain is a constructor that allows the class to be instantiated from one or data model classes and perhaps a method or two to construct a data model class from the presentation class. Avoid defining business logic code on these classes.