adding a context file

Question

Naimish Makwana · Answer

Sure, I can guide you on how to add a context file in .NET Core. Here are the steps: Create a new C# class AppDbContext : This will be your context class and you can choose any name you want1. Inherit from the base class DbContext : Your newly created class should inherit from the DbContext class1. Inject DbContextOptions into constructor and pass it to the base class : This is done to configure the DbContext1. Here’s a basic example of what your DbContext class could look like: public class ApplicationDbContext : DbContext { public ApplicationDbContext(DbContextOptions options) : base(options) { } // DbSets for your entities } Add the DbContext to your configured services in Startup.cs : You can do this in the ConfigureServices method2. Here’s an example: public void ConfigureServices(IServiceCollection services) { services.AddControllers(); services.AddDbContext (options => options.UseSqlServer("name=ConnectionStrings:DefaultConnection")); } In the above code, ApplicationDbContext is the DbContext subclass and it’s registered as a scoped service in the ASP.NET Core application service provider2. The context is configured to use the SQL Server database provider and will read the connection string from ASP.NET Core configuration2. Setup the DbContext in the controllers that will use it 3. Remember, it’s very important to dispose the DbContext after use. This ensures both that any unmanaged resources are freed, and that any events or other hooks are unregistered so as to prevent memory leaks in case the instance remains referenced2. Thanks

Nikunj Satasiya · Answer

Hi Will, can you provide some details for your question? what exectly you looking for?

Abhishek Yadav · Answer

using System; using System.Data.SqlClient; class ConnectedModeExample { static void Main() { string connectionString = "your_connection_string_here"; string query = "SELECT * FROM YourTable"; using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); SqlCommand command = new SqlCommand(query, connection); using (SqlDataReader reader = command.ExecuteReader()) { while (reader.Read()) { Console.WriteLine($"{reader["ColumnName"]}"); } } } } }

Vishal Yelve · Answer

Hi Will, create APIDbContext Class which will inherit from DbContext class. public class APIDbContext: DbContext { public APIDbContext(DbContextOptions options): base(options) {} public DbSet Departments { get; set; } public DbSet Employees { get; set; } } add constructor in your repository private readonly APIDbContext _appDBContext; public DepartmentRepository(APIDbContext context) { _appDBContext = context ?? throw new ArgumentNullException(nameof(context)); } Don't forget to register services.AddScoped (); services.AddScoped (); services.AddDbContext (options => options.UseSqlServer(Configuration.GetConnectionString("EmployeeAppCon"))); do refer to my article for a complete understanding https://www.c-sharpcorner.com/article/net-core-3-1-web-api-crud/

adding a context file

Answers (4)