C# - 控制器看不到服务

Question

控制器无法查看服务。当我在API上推送添加请求时，它会给我代码500错误。这是错误
有人能帮我吗？

控制器：

[ApiController]
[Route("[controller]")]
public class ToDosController:Controller
{
IToDoService service;
public ToDosController(IToDoService _service)
{
service = _service;
}

[HttpPost]
public void Add(ToDo toDo)
{
service.Add(toDo);
}

服务：

public class ToDoService : IToDoService
{
IToDoFW database;
public ToDoService(IToDoFW _database)
{
this.database = _database;
}
public void Add(ToDo toDo)
{
database.Add(toDo);
}
}

这是我的程序。cs代码：

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at 
https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddDbContext<ToDoContext>();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
IServiceCollection services;
app.UseHttpsRedirection();
app.UseAuthorization();
app.MapControllers();
app.Run();

Fw表示FrameWork。我希望你能帮我，谢谢你阅读

Answer 1

您必须在Program.cs(适用于.NET6及更高版本(或Startup.cs(.NET 5.0及更低版本(中将服务添加到IServiceCollection中。

services.AddScoped<IToDoService, ToDoService>();