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Entity framework add data annotations11/18/2023 ![]() ![]() _employeerepository = employeerepository Public EmployeeController(IEmployeeRepository employeerepository) Private IEmployeeRepository _employeerepository Public class EmployeeController : ControllerBase I have not covered validations here but before calling the repository method input should be validated. Implementation has been added by calling the methods in the repository class. Employee Repository has been passed as constructor parameter using dependency injection. Here is the code for the Employee controller which has been added to expose the CRUD operations for the Employee entity as an API. If you want to read more about how to handle multiple environments you can read my other article on Configuring multiple ASP.NET Core hosting environment Add Employee controller Also, we can pass different repository implementations based on environments. Since the repository is passed as a service till the database is ready we can create a dummy repository service for simulation of CRUD operations. Repository helps in better testing of the code. Return "Employee details deleted modified" Īs shown below register Employee repository as a service in the ConfigureServices method of Startup class services.AddTransient() If (employeedel = null) return "Employee does not exists" Var employeedel = _(empid => empid.Id = id).FirstOrDefault() Return "Employee details successfully modified" If (employeeupt = null) return "Employee does not exists" Įmployeeupt.Designation = employee.Designation Var employeeupt = await _(empid => empid.Id = id).FirstOrDefaultAsync() Public async Task Update(int id, Employee employee) Var employee = await _(empid => empid.Id = id).FirstOrDefaultAsync() Public async Task Create(Employee employee) Public EmployeeRepository(IApplicationDbContext dbcontext) Private IApplicationDbContext _dbcontext public class EmployeeRepository : IEmployeeRepository We are using localdb database which is a lightweight version of the SQL Server Express database engine. ![]() Specify the SQL Server connection string in the appsettings.json file. Public ApplicationDbContext(DbContextOptions options) } public class ApplicationDbContext : DbContext, IApplicationDbContext The database table will have the same name as the DbSet property name. An entity set typically represents a database table and an entity represents a row in the table. This class creates a DbSet property for the Employee entity set. You need to derive the class from the entity framework DbContext class and specify the entities included in the data model. This is the main class that coordinates Entity Framework functionality for a given model class. Install-Package Microsoft.EntityFrameworkCore You run the below mentioned commands in Package Manager or install required Nuget packages from Nuget Package Manager. We need to install the required entity framework packages. Entity framework interprets property named as Id or ID as the primary key public class Employee Here Id will become the primary key column for the database table that will be created for this class. Create the data modelĬreate an Employee entity class. We will be using the code-first approach for the demonstration. Entity framework core has been rewritten from scratch to make it lightweight, flexible & achieve better performance.įor demonstration purposes, we will be creating an ASP.NET Core 3.1 API Project using Visual Studio 2019 Community Edition. It is an open-source object-relational mapper (ORM) built over ADO.NET and an official data access platform from Microsoft. Entity framework core was introduced for.
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