.NET Core WebAPI 开发工程师面试常见问题 | 极客日志

.NET Core WebAPI 开发工程师面试常见问题 | 极客日志

[ApiController]
[Route("api/[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly string[] Summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Hot", "Sweltering"
    };

    [HttpGet]
    public IEnumerable<WeatherForecast> Get()
    {
        var rng = new Random();
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = rng.Next(-20, 55),
            Summary = Summaries[rng.Next(Summaries.Length)]
        }).ToArray();
    }
}

dotnet new webapi -n MyApi

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseRouting();
    app.UseAuthentication();
    app.UseAuthorization();
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });
}

[ApiController]
[Route("api/[controller]")]
public class ProductsController : ControllerBase
{
    [HttpGet]
    public IActionResult GetProduct(int id)
    {
        try
        {
            var product = _productService.GetProductById(id);
            if (product == null) throw new NotFoundException("Product not found.");
            return Ok(product);
        }
        catch (NotFoundException ex)
        {
            return NotFound(new { message = ex.Message });
        }
    }
}

app.UseExceptionHandler("/Home/Error");

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy("AllowSpecificOrigin", builder =>
            builder.WithOrigins("http://example.com")
                   .AllowAnyHeader()
                   .AllowAnyMethod());
    });
}

public void Configure(IApplicationBuilder app)
{
    app.UseCors("AllowSpecificOrigin");
}

public class WeatherForecastControllerTests
{
    private readonly WeatherForecastController _controller;

    public WeatherForecastControllerTests()
    {
        _controller = new WeatherForecastController();
    }

    [Fact]
    public void Get_Returns200Ok()
    {
        var result = _controller.Get();
        var okResult = Assert.IsType<OkObjectResult>(result);
        Assert.Equal(200, okResult.StatusCode);
    }
}

FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS base
WORKDIR /app
EXPOSE 80
COPY ./bin/Release/net5.0/publish/ .
ENTRYPOINT ["dotnet", "MyApi.dll"]

docker build -t myapi .
docker run -d -p 80:80 myapi