How to Build a CRUD Application with ASP NET Core 3.1 & Entity Framework 3.1 Using Visual Studio 2019

It converts queries to domain models and vice versa from a domain model to a client data model, but query models can also be used in query processors. In this article, I’ll show you how to make an API for a small cost management system, including basic settings for authentication and access control, but I will not go into the authentication subsystem. I will cover the whole business logic of the system with modular tests and create at least one integration test for each API method on an example of one entity.

Venkat, Great detail.You made it clear to me how the middleware pipeline works. Also at some point show what happens when middlewares are added in the wrong order .Thanks again. Free C#, .Net and Sql server video tutorial for beginners and intermediate programmers. After that we used AddNewtonsoftJson() but it didn’t take changes and we are not able to use newtonsoft.json functionality like ignorenull value . If I didn’t find this solution, I would probably return the web api service from .net core to the .net framework due to the number of problems in .net core, including serialization. I’m about to do a post with a few gotchas that come with switching to the built in JSONConverter.

Some cool C# one-liners!

Entity classes are used to pass data between different parts of the application (e.g. between services and controllers) and can be used to return http response data from controller action methods. If multiple types of entities or other custom data is required to be returned from a controller method then a custom model class should be created in the Models folder for the response. In the absence of an ORM typically lots of code have to be written to perform CRUD operations with the database. Using an ORM like entity framework can reduce the number of lines of code to be written for database interactions. Lastly, we have initTable() in which we have called the util.js i.e. Util.request class that we made earlier, passed it some parameters like the urlGetData and it’ll be a GET call and we’re expecting an html page in response.

For the demo purpose I have used BigInt instead of Int. You can create separate data access layer and can use Stored Procedure to perform CRUD operations. Confirmation will be requested before it’s deleted from the database. Then, change the default application route to load the Products Controller instead of the home controller. Open the Startup.cs file and under the Configure method, change the default controller to Products.

Let’s run & test the code

The attribute is located in the folder Expenses/Filters. As a result, this filter returns data of type DataResult to the API client. The implementation of the method is very simple, we get a query to the database which is mapped in the IQueryable from ExpensesQueryProcessor, asp net core 3.1 tutorial which in turn returns as a result. This method uses the helper class to find all mappings between models and entities and vice versa and gets the IMapper interface to create the IAutoMapper wrapper that will be used in controllers.

  • So, we will need an efficient way to read and securely write clean data into our data source.
  • I’m a web developer in Sydney Australia and co-founder of Point Blank Development, I’ve been building websites and web applications in Sydney since 1998.
  • Entity class properties with name ID or classnameID are assumed as primary key.
  • Run the following scaffold command in Package Manager Console to reverse engineer the database to create database context and entity POCO classes from tables.
  • Examples might be simplified to improve reading and basic understanding.

I have not covered validations here but before calling the repository method input should be validated. We need to install the required entity framework packages. You run the below mentioned commands in Package Manager or install required Nuget packages from Nuget Package Manager. Entity Framework has been around since 2008 which has improved over the years. Entity framework core was introduced for .NET Core based applications.

How to Use Core Runtime?

My article Secure ASP.NET Core Web API using API Key Authentication explains how you can apply API Key authentication using either a custom attribute or middleware in .NET 6. The data will be serialized in JSON format when send from POST or PUT request body, this is usually the most commonly used request body data transmission encryption type. Note that the dotConnect for PostgreSQL assembly for Entity Framework Core 2.2 is not available via NuGet packages anymore. It is installed by the dotConnect for PostgreSQL installer to the \Entity\EFCore2\netstandard2.0\ subfolder of the dotConnect for PostgreSQL installation folder. A web API provides an interface to a system’s business logic access to the database and underlying logic are encapsulated in the API. Next, configure the routing of the ~ / api / Expenses type by marking the class with the attribute [Route (“api / “)].

In the next article, we will understand the basic file structure of the project that we have created. Lightweight and high-performance modular request pipeline which is suitable for the modern cloud-based application. One thing you should always keep in mind is that the entity framework doesn’t fit in all the scenarios so please do your research well before deciding to implement it in your project.

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We have successfully created the Student Database using the Code First Approach of Entity Framework Core in ASP.NET Core! Now let’s move to perform CRUD Operations for the Student Entity. Line #3 defined the name of the context class to be added. I will create a Student Model in the Models folder, and add a bunch of properties to it. For this demonstration, we will be using SQLServer as our database provider.

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