API控制器的构造函数在我的Blazor项目中从未被调用

Question

我是Blazor的新手，我创建了一个API控制器来处理我的CRUD例程。它有一个构造函数，所以我可以将与数据库的连接保存到一个私有成员。然而，当我的应用程序启动时，构造函数永远不会被调用。我还试图向控制器发送POST，我收到了一个错误的请求，所以我认为它仍然没有正确设置。谢谢你的帮助！

启动.cs

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Error");
// 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.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
endpoints.MapBlazorHub();
endpoints.MapFallbackToPage("/_Host");
});
}

PTSEventController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using ComEd.PTS.DataStore.Models;
using Microsoft.AspNetCore.Mvc;
namespace ComEd.PTS.Event.UI.Controllers
{
[Route("api/[controller]")]
public class PTSEventController : ControllerBase
{
private readonly PeakTimeSavingsDBContext _dbContext;
public PTSEventController(PeakTimeSavingsDBContext dbContext)
{
_dbContext = dbContext; //<<<< The constructor never gets called >>>>
}
// GET: api/<controller>
[HttpGet]
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}
// GET api/<controller>/5
[HttpGet("{id}")]
public string Get(int id)
{
return "value";
}
// POST api/<controller>
[HttpPost]
public void Post([FromBody]string value)
{
int x = 0;
x++;
}
// PUT api/<controller>/5
[HttpPut("{id}")]
public void Put(int id, [FromBody]string value)
{
int x = 0;
x++;
}
// DELETE api/<controller>/5
[HttpDelete("{id}")]
public void Delete(int id)
{
int x = 0;
x++;
}
}
}

Answer 1

是否将类添加为服务？

在startup.cs:中的ConfigureServices((中

services.AddSingleton<PTSEventController>();