Angular 4代码没有命中ASP.Net Web Api控制器

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable()
export class DataService {
  constructor(private http: HttpClient) {}

  getData() {
    return this.http.get('http://your-api-url/api/data');
  }
}

using System.Web.Http;

namespace YourNamespace.Controllers
{
    [RoutePrefix("api/data")]
    public class DataController : ApiController
    {
        [HttpGet]
        [Route("")]
        public IHttpActionResult GetData()
        {
            // 处理请求并返回数据
            var data = new { message = "Hello from Web API!" };
            return Ok(data);
        }
    }
}

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API 路由
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

        // 启用 CORS
        var cors = new EnableCorsAttribute("*", "*", "*");
        config.EnableCors(cors);
    }
}