Given your familiarity with this text, aren't the ViewModels used in ASP.NET MVC the same as DTOs? Now in my web project, I need a way for an admin user to add a new test to the system, or update one that already exists.

Use your one set of EF models for everything. You don't want that auto generated. POCO comes from POJO, so I think your comment has merit from an anti-java standpoint.

This option seems to be the Best Practice but also seems heavy to mantain. WPF ViewModels actually are sort of the controllers and have services injected etc, but a ViewModel in ASP.NET is literally a POCO passed from the controller to MVC View.

so DTO's can just be structs (or is a class that should mimic the capabilities of a struct)? For example, you're developing an e-Commerce site. However, in the end, I found that it's usually not worth it in the long run. Asking for help, clarification, or responding to other answers. Now your domain AND presentation layer would be broken. It allows you to combine your model as and ORM very simply. It's also OK for the ViewModel to reference the DTO as a complex property. RESTful APIs are based on nouns — you’re performing actions on endpoints that are things. They should be serializable to allow transfer across the wire. A View Model is intended to be sent to a View, where it will be displayed, with formatting. So much easier. because i think it is even worse if you have a ViewModel that contains a DTO, we will have the same problem. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Using Swagger, you can support an endpoint on your web application that will provide an interactive view of all of your public API endpoints and their expected data signatures. DTO Pattern was used for transferring data outside the process, for example over the wire and not between layers inside the same process. Re: What is the correct approach use ViewModel and DTO in MVC. What is the correct approach use ViewModel and DTO in MVC. Why should we have multiple types for describing what is probably the same thing in our system? In a Multi-layer project with Domain layer (DL)/Business (Service) Layer (BL)/Presentation Layer (PL), what is the best approach to deliver Entities to the Presentation Layer? So just create those objects and decorate the properties with your validation.

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Data Model: Overloaded term that refer to a number of different contexts. Similar: Should I build model for every view from DTO, Mapping Validation Attributes From Domain Entity to DTO. Apart from the pointless assignment of an object to another type and then back again in the second example, your business layer should know nothing about viewmodels. I tried to clear myself. Should I implement DTOs in repository pattern with EF? I hope this make sense.

Using models dedicated to your front end once again avoids this issue. I shared DTOs between layers this last project. No conflation of responsibilities. You could call it that, but it would be misleading. In fact, the author of AutoMapper, at one time, outright said not to use it in production code. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. The main difference between REST-styled APIs and RPC/SOAP-styled APIs to me is the difference between nouns and verbs.

With proper models, you can focus on what is important within the layer of that model -- like validation in the presentation layer, or behavior and encapsulation in the business layer, or structure and normalization in the data layer. To learn more, see our tips on writing great answers. They serve a similar purpose (encapsulating data for another layer of the application) but they do it differently and for different reasons.

The view can be a web page, a windows/wpf form, or an API endpoint. I hate the three horizontal bars on top. I have returned anonymous types and it works but it is bad in the long run. Data Model: Overloaded term that refer to a number of different contexts. What you have is fine. There are plans for record types in C# at some point (you can find it on GitHub) so eventually you might be able to not need the F# part for this. If the server-side code isn’t written carefully, it might silently accept whatever the user sends and then persist it to the data store using simple EF commands like Add() and SaveChanges(). Generally DTOs are used to ship data from one layer to another layer across process boundries as calls to a remote service can be expensive so all the required data is pushed into a DTO and transferred to the client in one chunk (coarse grained). So, now all the model generate based on the database.

Why sister [nouns] and not brother [nouns]? This means your contracts can contain that validation. It has behavior that enforces business rules.

A common scenario would be to add links. What is a proper way to support/suspend cat6 cable in a drop ceiling? The group of isometries of a manifold is a Lie group, isn't it? There's no need to separate those since they share the same concern.

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