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My English skill is poor because I'm not a native English speaker.
I hope you to understand.
I have written an application whose structure is MVVM in WPF.
An idea floated into my mind while writing an application.
In MVVM pattern, I know that the ViewModel must split with View and to achieve this goal we use behavior, attached property, EventToCommand of the MVVM Light, etc situationally.
But I think that using together more than two skills of the above skills to handle the event of View on the ViewModel complicates the connection structure of the whole logic.
So... I curious what it's like to drive the all logic to handle the event of View into Behavior situationally.
Perhaps the structure looks like this:
ViewModel has only a data structure to connect with View and logic related to the data structure. (Ex: TestViewModel)
The logic of the ViewModel only is written on Behavior. (Ex: TestViewModelBehavior)
Thank you for reading.
I can't understand what is your problem correctly, maybe because my English skill is poor too :) but:
I think you can inherit TestViewModel from TestViewModelBehavior or if you want to have different Behavior in each ViewModel you can inject different implementations of TestViewModelBehavior to TestViewModel.
I hope to help you.
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I am in the Process of converting a VB project to C# WPF. We are planning to do with MVVM concept and I am in the learning process. To my understanding each form in VB is a View. Each view should have a corresponding Model and ViewModel.
For the Second Form, another view and a corresponding Model and ViewModel.
If there are n Forms in VB, there will be n Views, n Models and n ViewModels in C#.
I am not sure what I asked here is right or not. Experts here please help
As far as the view is concerned, you're right. Each form will have a view for presentation and a view model for presentation logic, or how your models should interact with the view. These are not necessarily one-to-one with models. You might have a model that encapsulates some data and business logic that you want to reuse. I suspect you VB projects had such classes.
MVVM Light is a simple and effective framework you may want to look into. This is a pretty good summary of MVVM using this framework.
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I'm doing a C# application using WPF. I'm trying to follow correctly the MVVM pattern because (especially with C#/WPF) is very useful.
My app is designed in 3 "big" parts, as the MVVM model says:
The view, in XAML -> The MainWindow.xaml
The ViewModel, in C# -> MainWindow.xaml.cs
The Model, in C# -> A my static class named Register.cs
It's a strong pattern, and it's working good.
My software manage lists of custom object: I press a button on the View, the ViewModel start a method (on Model) that retrieve lists of data from database and I bind them on the View side (on a ListView, in WPF).
All is working good. But, even after reading a lot about MVVC pattern, I cannot understand a thing: where I should memorize these lists?
For now, I'm declaring these lists on Model and they can be retrieved by simply calling them through the ViewModel but I don't know if it's the right approach.
I need to maintain these lists and a lot of others strings (like current username and things like that) until I close the software (or I need to save them).
All data come from INI or DBs, and I don't know where I should "temporary" memorize them, if on the ViewModel (why? because its the View that interact with them) or in the Model? (isn't smarter to retain the data "near" the place where you got them?)
Also,in the future, I would like to port the software in UWP or Mono, so I should simplify myself the jump. Also, in that case, I think I will have to discharge all the works I've done on the ViewModel.
Where I should memorize all "temporary" data used by the software? In the M or in the VM?
The way I think about where to put something is like this: answer the question if it is a business (data) concern or a UI (presentation) concern. First will go in the model, the second in the view model.
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I know my question is subjective and context dependent, but being a beginner to MVVM, I came to know that generally one of the MVVM class is made singleton. Can anybody please tell me if I have Model, ViewModel and View class, generally people prefer which class as singleton and why is it so?
Technically, the Application class is really the only "required singleton" in a WPF application, and that's mainly because WPF will create it for you.
Otherwise, I typically avoid singletons in my WPF applications completely - there is no reason to introduce them.
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I am working in MVC from last one year. I am following the MVC approach i.e simple appraoch and not Repository patterns. Now, I come to know about the advantages of using Repository with dependency injection and I feel it follows the oops in right way.
That is my thinking.
In one of my sample/test project I started working with repositor and have few questions about it:::
1) when we use EDMX , suppose I have a table names "Users", it automattically
creates a class named as "users" which contains all the fields as properties.
What I usually follow is I create a model layer and add a class in that model layer of name
"myUsers" that will contains same properties as the class users have.Now, I will bind the view
page with "myUsers" so that it cannot deal directly with DAL.
and Whenever I post something from my view page , the object comes in "MyUsers" model,
and here I again do something like this.
Users=MyUsers(I do this by doing this for each property like::
Users.Name=MyUsers.Name
and then I save it in Database.
I use above approach and in my applications I have used the above approach.
Now my question is
Can I bind my view page directly with "Users" class? As I see some applications,
it is happening. It reduced much work and also overheads in application.
What is correct approach ? to deal directly with DAL or there should be models
in between them?
"Correct approach" is subjective. We like to create ViewModels that exist purely to show domain objects in a view because it means we can separate view logic from the domain. We may not always want to show / load every property of a domain object. As another example, we put DataAnnotations attributes for validation on our ViewModels.. but we leave the domain objects as nice little POCO's.
Manually mapping them like you are is an incredible waste of time though. There are frameworks that do that for you.. such as:
Automapper
ValueInjector
According to me, this is the correct architecture.
Let me explain the answer in comments below.
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So I'm having trobule figuring out the best way to use the MVVM pattern while creating a WPF control dynamically within
my code. Would this even make sense or is it better to avoid the MVVM pattern all together?
If it does make sense then please share code examples of the view model.
In general, if you're using MVVM, controls will only be created "dynamically" in response to the data changing. If you have an ItemsControl bound to a collection, for example, the controls to represent the items will automatically be created for you.
If you're talking about making a custom control in general, custom controls are really "pure view", so MVVM doens't really make sense in this scenario. The main goal of creating a custom control is to build it in a way so that it can be used by code developed with MVVM, which typically means building the control with proper Dependency Properties (so data binding works properly), etc.