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What are the differences between MVVM mode and MVC mode? In view of this problem, this article introduces the corresponding analysis and answers in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

1. MVVM pattern is derived from MVC pattern.

2. MVVM mode is two-way binding data, while MVC mode is one-way communication.

3. MVVM mode is generally used for front-end development, while MVC mode is used more on the server side.

MVC

The MVC pattern was originally rooted in server-side Web development, and then gradually became competent for client-side Web development, meeting its complexity and richness.

MVC is an abbreviation for Model-View-Controller, which divides the application into three parts:

Model: model (used to encapsulate data related to the business logic of the application and how to handle the data)

View: views (rendered pages)

Controller: controller (connector between M and V that controls the flow of the application and the business logic of the page)

MVC features:

The MVC pattern is characterized by the separation of concerns, that is, the data model in the application is decoupled from the business and presentation logic. In the development of client-side web, the model (M-data, operation data) and view (V-HTML elements that display data) are separated and loosely coupled, making it a client application that is easier to develop, maintain and test.

1. View sends instructions to Controller

2. After the Controller completes the business logic, the Model is required to change the state.

3. Model sends the new data to View, and users get feedback.

Advantages of MVC:

Low coupling and separation of the view layer from the business layer allows the view layer code to be changed without recompiling the model and controller code.

High reusability

Low life cycle cost

MVC reduces the technical content of developing and maintaining user interfaces.

High maintainability and separation of view layer and business logic layer make WEB applications easier to maintain and modify

Quick deployment

Disadvantages of MVC:

Not suitable for small, medium-sized applications, and spending a lot of time applying MVC to applications that are not very large often outweighs the gain.

The view and the controller are too closely connected, the view and the controller are separated from each other, but they are closely related components, the view does not have the existence of the controller, its application is very limited, and vice versa, which hinders their independent reuse.

The inefficient access of the view to the model data, depending on the model operation interface, the view may need to be called many times to get enough display data. Unnecessary frequent access to unchanged data will also damage operational performance.

MVC applications:

At the beginning of the popularity of web app, MVC was used in java (struts2) and C# (ASP.NET) server applications, and later in client applications, based on the MVC model, AngularJS came into being.

MVVM

MVVM is the abbreviation of Model-View-ViewModel. Microsoft's WPF (Windows Presentation Foundation- 's Windows-based user interface framework) brings a new technical experience, which makes the software UI layer more detailed and customizable. At the same time, at the technical level, WPF also brings some new features, such as Binding (binding), Dependency Property (dependent attribute), Routed Events (routing event), Command (command), DataTemplate (data template), ControlTemplate (control template) and so on. MVVM pattern is actually a new type of architecture pattern developed from the combination of MV pattern and WPF. It is based on the original MVP framework and combines the new features of WPF to cope with the increasingly complex needs of customers.

Advantages of MVVM:

The MVVM schema is similar to the MVC schema in that the main purpose is to separate the view (View) from the model (Model), with several major advantages:

Low coupling, View can be changed and modified independently of Model, a ViewModel can be bound to different "View", Model can not change when View changes, and View can not change when Model changes.

Reusability, you can put some view logic in a ViewModel, so that many view can reuse this view logic.

Independent development, developers can focus on business logic and data development (ViewModel), designers can focus on page design, using Expression Blend can easily design the interface and generate xml code.

Testable, the interface has always been difficult to test, but now tests can be written for ViewModel.

This is the answer to the question about the difference between MVVM mode and MVC mode. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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