Postman 请求返回 404 Not Found

Question

我创建了小型 Rest API 应用程序并尝试使用 Postman 对其进行测试，但一无所获。

这是以下代码：

-动物

namespace VeterinaryClinicShelter.Models;

public class Animal
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Category { get; set; }
    public double Weight { get; set; }
    public string FurColor { get; set; }
}

-动物控制器

using Microsoft.AspNetCore.Mvc;
using VeterinaryClinicShelter.Models;

namespace VeterinaryClinicShelter.Controllers;

[ApiController]
[Route("[controller]")]
public class AnimalController : ControllerBase
{
    private static readonly List<Animal> Animals =
    [
        new Animal { Id = 1, Name = "Buddy", Category = "Dog", Weight = 15.2, FurColor = "Brown" },
        new Animal { Id = 2, Name = "Whiskers", Category = "Cat", Weight = 7.5, FurColor = "White" },
        new Animal { Id = 3, Name = "Fluffy", Category = "Cat", Weight = 6.8, FurColor = "Gray" },
        new Animal { Id = 4, Name = "Max", Category = "Dog", Weight = 20.5, FurColor = "Black" },
        new Animal { Id = 5, Name = "Snowball", Category = "Rabbit", Weight = 3.2, FurColor = "White" }
    ];

    [HttpGet]
    public ActionResult<List<Animal>> GetAnimals()
    {
        return Animals;
    }

    [HttpGet("{id}")]
    public ActionResult<Animal> GetAnimalById(int id)
    {
        var animal = Animals.FirstOrDefault(a => a.Id == id);

        if (animal == null)
        {
            return NotFound();
        }

        return animal;
    }

    [HttpPost]
    public ActionResult<Animal> AddAnimal(Animal animal)
    {
        if (Animals.Any(a => a.Id == animal.Id))
        {
            return Conflict("Animal with such ID already exists");
        }

        Animals.Add(animal);

        return CreatedAtAction(nameof(GetAnimalById), new { id = animal.Id }, animal);
    }

    [HttpPut("{id:int}")]
    public ActionResult<Animal> EditAnimal(int id, Animal newAnimal)
    {
        var index = Animals.FindIndex(animal => animal.Id == id);

        if (index == -1) return NotFound();

        Animals[index].Name = newAnimal.Name;
        Animals[index].Category = newAnimal.Category;
        Animals[index].Weight = newAnimal.Weight;
        Animals[index].FurColor = newAnimal.FurColor;
        return NoContent();
    }

    [HttpDelete("{id:int}")]
    public ActionResult<Animal> DeleteAnimal(int id)
    {
        var deleteAnimal = Animals.FirstOrDefault(animal => animal.Id == id);

        if (deleteAnimal == null) return NotFound();

        Animals.Remove(deleteAnimal);
        return NoContent();
    }
}

-Program.cs 的内容（由 Rider 自动生成）

using VeterinaryClinicShelter.Components;

var builder = WebApplication.CreateBuilder(args);


// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();

var app = builder.Build();


// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();

app.UseStaticFiles();
app.UseAntiforgery();

app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();

app.Run();

邮差GET请求：

http://localhost:5039/Animal

我确定我使用的是正确的端口。

如果该信息有帮助： IDE：Rider，模板：ASP.NET Core Web 应用程序模板，类型：Blazor Web App，框架：net8.0

我询问了这个问题，没有给我任何有用的信息。

Answer 1

您似乎创建了错误的应用程序来构建 Web API 应用程序。

您应该使用 ASP.NET Core Web API 而不是 Blazor Web 应用程序。

第1步：选择ASP.NET Core Web API模板

第2步：配置新项目（位置）

步骤3：

在本节中，您将配置要生成的应用程序模板：

1. 框架 - 哪个框架？ .NET 6.0、.NET 7.0 等

2. 启用开放 API 支持 - 生成 Swagger API 文档

3. 不要使用顶级语句 - 使用 Main 方法创建

   Program.cs

   ，而不使用顶级语句。

4. 使用控制器 - 创建控制器（类）而不是最小的 API。

项目创建完成后，可以看到生成了Program.cs，如下：

using VeterinaryClinicShelter.Components;

var builder = WebApplication.CreateBuilder(args);


// Add services to the container.
builder.Services.AddControllers(); // Add services for controllers

var app = builder.Build();


// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();


app.MapControllers(); // map attribute routed controllers.

app.Run();

参考：教程：使用 ASP.NET Core 创建 Web API