ASP.NET Core 8: создание REST API

1dotnet new webapi -n MyApi
2cd MyApi
3dotnet run

1// Program.cs
2var builder = WebApplication.CreateBuilder(args);
3
4builder.Services.AddEndpointsApiExplorer();
5builder.Services.AddSwaggerGen();
6
7var app = builder.Build();
8
9if (app.Environment.IsDevelopment())
10{
11    app.UseSwagger();
12    app.UseSwaggerUI();
13}
14
15var todos = new List<TodoItem>();
16
17app.MapGet("/todos", () => Results.Ok(todos))
18    .WithName("GetTodos")
19    .WithOpenApi();
20
21app.MapGet("/todos/{id}", (int id) =>
22{
23    var todo = todos.FirstOrDefault(t => t.Id == id);
24    return todo is not null ? Results.Ok(todo) : Results.NotFound();
25})
26    .WithName("GetTodoById");
27
28app.MapPost("/todos", (TodoItem item) =>
29{
30    item.Id = todos.Count + 1;
31    todos.Add(item);
32    return Results.Created($"/todos/{item.Id}", item);
33})
34    .WithName("CreateTodo");
35
36app.MapPut("/todos/{id}", (int id, TodoItem updated) =>
37{
38    var todo = todos.FirstOrDefault(t => t.Id == id);
39    if (todo is null) return Results.NotFound();
40    
41    todo.Title = updated.Title;
42    todo.IsCompleted = updated.IsCompleted;
43    return Results.Ok(todo);
44})
45    .WithName("UpdateTodo");
46
47app.MapDelete("/todos/{id}", (int id) =>
48{
49    var todo = todos.FirstOrDefault(t => t.Id == id);
50    if (todo is null) return Results.NotFound();
51    
52    todos.Remove(todo);
53    return Results.NoContent();
54})
55    .WithName("DeleteTodo");
56
57app.Run();
58
59public record TodoItem
60{
61    public int Id { get; set; }
62    public string Title { get; set; } = string.Empty;
63    public bool IsCompleted { get; set; }
64}

1[ApiController]
2[Route("api/[controller]")]
3public class TodosController : ControllerBase
4{
5    private readonly ITodoService _service;
6
7    public TodosController(ITodoService service)
8    {
9        _service = service;
10    }
11
12    [HttpGet]
13    public async Task<ActionResult<IEnumerable<TodoDto>>> GetAll()
14    {
15        var todos = await _service.GetAllAsync();
16        return Ok(todos);
17    }
18
19    [HttpGet("{id}")]
20    public async Task<ActionResult<TodoDto>> GetById(int id)
21    {
22        var todo = await _service.GetByIdAsync(id);
23        return todo is not null ? Ok(todo) : NotFound();
24    }
25
26    [HttpPost]
27    public async Task<ActionResult<TodoDto>> Create(CreateTodoDto dto)
28    {
29        var created = await _service.CreateAsync(dto);
30        return CreatedAtAction(nameof(GetById), new { id = created.Id }, created);
31    }
32
33    [HttpPut("{id}")]
34    public async Task<IActionResult> Update(int id, UpdateTodoDto dto)
35    {
36        var result = await _service.UpdateAsync(id, dto);
37        return result ? NoContent() : NotFound();
38    }
39
40    [HttpDelete("{id}")]
41    public async Task<IActionResult> Delete(int id)
42    {
43        var result = await _service.DeleteAsync(id);
44        return result ? NoContent() : NotFound();
45    }
46}

1using FluentValidation;
2
3public class CreateTodoDtoValidator : AbstractValidator<CreateTodoDto>
4{
5    public CreateTodoDtoValidator()
6    {
7        RuleFor(x => x.Title)
8            .NotEmpty().WithMessage("Title is required")
9            .MaximumLength(200).WithMessage("Title too long");
10        
11        RuleFor(x => x.Priority)
12            .InclusiveBetween(1, 5);
13    }
14}

1// Program.cs
2builder.Services.AddSwaggerGen(c =>
3{
4    c.SwaggerDoc("v1", new OpenApiInfo
5    {
6        Title = "My API",
7        Version = "v1",
8        Description = "REST API for Todo application"
9    });
10});

1app.UseExceptionHandler(errorApp =>
2{
3    errorApp.Run(async context =>
4    {
5        context.Response.ContentType = "application/json";
6        var error = context.Features.Get<IExceptionHandlerFeature>();
7        
8        await context.Response.WriteAsJsonAsync(new
9        {
10            Status = 500,
11            Message = "Internal server error"
12        });
13    });
14});