以下是login.component.ts的代码,

login() {
const val = this.form.value;

if (val.email && val.password) {
  this.authService.login(val.email, val.password)
    .subscribe(
      data => {

        if (data && data.Token) {
          // store user details and jwt token in local storage to keep user logged in 
          //between page refreshes
          localStorage.setItem('currentUser', JSON.stringify(data));
          console.log("user logged in");
          this.router.navigate([this.returnUrl]);
        } else {
          console.log("user not logged in");
        }

      },
      error => {
        this.error = error;
      });
 }
}

以下是角度服务的代码,

login(email: string, password: string) {
 return this.http.post<User>(this.baseUrl + "Authenticate", { email, 
password }, httpOptions);
}

下面是dotnetcore 2.1 web api动作的代码,

using System;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using System.Text;
using API.Utilities;
using Business.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;


namespace API.Controllers
{
  [Authorize]
  [Produces("application/json")]
  [Route("api/[controller]")]
  public class UsersController : BaseController
{
    private readonly AppSettings _appSettings;

    public UsersController(IOptions<AppSettings> appSettings)
    {          
        _appSettings = appSettings.Value;
    }

    [AllowAnonymous]
    [HttpPost]
    [Route("Authenticate")]
    public IActionResult Authenticate([FromBody]User userParam)
    {
        var user = Authenticate(userParam.Email, userParam.Password);

        if (user == null)
            return BadRequest(new { message = "Username or password is incorrect" });

        return Ok(user);
    }



    public User Authenticate(string username, string password)
    {
        //////code goes

        return user;
    }


}
} 

}

在小提琴手总是我可以看到我的帖子请求长度为-1.不确定有什么问题有什么帮助吗？

以下是来自startup.cs.我的CORS设置中是否存在dotnetcore2.1 WEB API解决方案的任何缺陷

  public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1).
            AddJsonOptions(options => {
            options.SerializerSettings.ContractResolver = new DefaultContractResolver();
        });

        services.AddDistributedMemoryCache();

        services.AddSession(options => {
            // Set a short timeout for easy testing.
            options.IdleTimeout = TimeSpan.FromSeconds(36000);
            options.Cookie.HttpOnly = true;
        });

        services.AddCors(options => {
            options.AddPolicy("CorsPolicy",
            builder => builder.AllowAnyOrigin()
            .AllowAnyMethod()
            .AllowAnyHeader()
            .AllowCredentials());
        });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseHsts();
        }

        app.UseStaticFiles();

        app.UseCors(x => x
        .AllowAnyOrigin()
        .AllowAnyMethod()
        .AllowAnyHeader()
        .AllowCredentials());
        app.UseSession();
        app.UseHttpsRedirection();
        app.UseAuthentication();
        app.UseMvc();

    }

解决方法:

您应该考虑到您的WEB API服务是从与Angular UI中的端口不同的端口加入的.在开发模式下托管UI的是Angular Cli.这意味着为您的WEB API启用CORS并不一定能为Angular的UI启用它们.

根据您发布的图像的外观,您的Web API的URL将是http：// localhost：44389,但referer是http：// localhost：4200.

在开发阶段解决此问题的一种方法是在ClientApp根文件夹中添加一个proxyconfig.json文件,其配置类似于：

{
  "/api/*": {
  "target": "https://localhost:44389",
  "secure": true,
  "changeOrigin": true
  }
}

这样浏览器会解释从Angular UI到WEB API的请求来自同一个来源.

如果您的WEB API和Angular UI要在生产模式下托管在同一台服务器上,我建议您避免使用CORS.这是一篇关于这个主题的好文章：https://medium.freecodecamp.org/the-best-ways-to-connect-to-the-server-using-angular-cli-b0c6b699716c

注意：您可能需要提供proxyconfig.json文件,方法如下：https://www.codeproject.com/Tips/1259121/%2FTips%2F1259121%2FAngular-Proxy-Configuration-for-API-Calls