Program.cs

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using AAA.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.OpenApi.Models;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSqlite<PizzaDB>("Data Source=DB\\Pizzas.db");

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo
    {
        Title = "Hello World",
        Description = "Minimal APIs",
        Version = "v1"
    });
});

var app = builder.Build();

app.UseSwagger();
app.UseSwaggerUI(c =>
{
    c.SwaggerEndpoint("/swagger/v1/swagger.json", "Hello APIs v1");
});

app.MapGet("/", () => "Hello World!");

app.MapGet("/pizzas/initial", async (PizzaDB db) =>
{
    await db.Pizzas.AddRangeAsync(new Pizza[]{
        new Pizza{Id=1,Name="Pizza1",Description="p1"},
        new Pizza{Id=2,Name="Pizza2",Description="p2"},
        new Pizza{Id=3,Name="Pizza3",Description="p3"},
        new Pizza{Id=4,Name="Pizza4",Description="p4"},
        new Pizza{Id=5,Name="Pizza5",Description="p5"}
    });
    await db.SaveChangesAsync();
    return Results.Ok();
});

app.MapGet("/pizzas", async (PizzaDB db) => await db.Pizzas.ToListAsync());

app.MapGet("/pizzas/{id}", async (PizzaDB db, int id) => await db.Pizzas.FindAsync(id));

app.MapPost("/pizzas", async (PizzaDB db, Pizza data) =>
{
    await db.Pizzas.AddAsync(data);
    await db.SaveChangesAsync();
    return Results.Created($"/pizza/{data.Id}", data);
});

app.MapPut("/pizza/{id}", async (PizzaDB db, Pizza data, int id) =>
{
    var pizza = await db.Pizzas.FindAsync(id);
    if (pizza is null) return Results.NotFound();
    pizza.Name = data.Name;
    pizza.Description = data.Description;
    await db.SaveChangesAsync();