Round #728

Show the basic structure of an ASP.NET Core controller with one GET endpoint.

```csharp using Microsoft.AspNetCore.Mvc; namespace MyApi.Controllers { [ApiController] [Route("api/[controller]")] public class MyController : ControllerBase { [HttpGet] public IActionResult Get() { // Return a simple message return Ok("Hello, World!"); } } } ``` In this example: - `MyController` is the name of the controller. - `[ApiController]` attribute enables API-specific features such as automatic model validation. - `[Route("api/[controller]")]` attribute specifies the base route for the controller. The `[controller]` token is replaced with the name of the controller, which in this case is `My`. - `[HttpGet]` attribute specifies that the `Get` method handles HTTP GET requests. - `IActionResult` is the return type of the `Get` method, which allows for a variety of return types, including `OkObjectResult`, `NotFoundResult`, etc. - `Ok("Hello, World!")` returns a 200 OK response with the message "Hello, World!".

```csharp using Microsoft.AspNetCore.Mvc; using Microsoft.Extensions.Logging; namespace MyApi.Controllers { [ApiController] [Route("api/[controller]")] public class MyController : ControllerBase { private readonly ILogger<MyController> _logger; public MyController(ILogger<MyController> logger) { _logger = logger; } [HttpGet] public IActionResult Get() { try { _logger.LogInformation("GET request received"); return Ok("Hello, World!"); } catch (Exception ex) { _logger.LogError(ex, "Error handling GET request"); return StatusCode(500, "Internal Server Error"); } } } } ``` This ASP.NET Core controller has a single GET endpoint that returns a "Hello, World!" message. The controller uses dependency injection to get an instance of `ILogger<MyController>`, which is used to log information and errors. The `Get` method is decorated with the `[HttpGet]` attribute to specify that it handles HTTP GET requests. If an exception occurs during the execution of the `Get` method, it is caught and logged, and a 500 Internal Server Error response is returned. In the `Startup.cs` file, you would need to add the following lines to register the logger and the controller: ```csharp public void ConfigureServices(IServiceCollection services) { services.AddControllers(); services.AddLogging(loggingBuilder => loggingBuilder.AddConsole()); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } app.UseRouting(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); } ```