从 asp.net core mvc 控制器使用 asp.net core web api 进行文件上传

Question

From swagger screenshot当我尝试从 swagger 或邮递员发布文件时，它工作正常。当我尝试从 mvc web 应用程序调用 api 时，它不起作用。我是 asp.net 核心的新手，没有显示错误，但 api 控制器没有点击这里是 mvc 控制器代码

 public async Task<PostViewModel> AddPost(PostViewModel model)
    {
        TestViewModel testViewModel = new TestViewModel()
        {
            Description = model.Description,
            Files = model.Files[0],
        };

        var formContent = new MultipartFormDataContent();
        formContent.Add(new StringContent(testViewModel.Description), "Description");
        formContent.Add(new StreamContent(testViewModel.Files.OpenReadStream()), "Files", Path.GetFileName(testViewModel.Files.FileName));
        HttpClient hc = new HttpClient();
        hc.BaseAddress = new Uri("baseurl");

        var response = await hc.PostAsync("PostFile", formContent);
        string apiResponse = await response.Content.ReadAsStringAsync();
        return null;
        //...
    }`

我的 api 控制器

 [HttpPost("PostFile", Name = "PostFile")]
    public async Task<IActionResult> PostFile([FromForm] TestViewModel testViewModel)
    {
        Console.Write("Hello");

        return null;
    }

Answer 1

我的建议是：

webapi和mvc不在同一个项目，需要在mvc启动时设置cors：

public void ConfigureServices(IServiceCollection services)

        {
            ......
            services.AddCors(options =>
            {
                options.AddPolicy("any", builder =>
                {
                    builder.WithOrigins("https://localhost:44320/WeatherForecast", "https://localhost:44393/WeatherForecast/PostFile")
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .AllowCredentials();
                });
            });
        }


public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

        {
          
            app.UseCors("cors");
            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapHub<ChatHub>("/chatHub");
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
            });
}

控制器中的代码：

 public IActionResult AddPost(PostViewModel model)

        {
            TestViewModel testViewModel = new TestViewModel()
            {
                Description = model.Description,
                File = model.File,
            };
            var url = "https://localhost:44320/WeatherForecast";
            HttpClient hc = new HttpClient();
            var formContent = new MultipartFormDataContent();
            formContent.Add(new StringContent(testViewModel.Description), "Description");
            formContent.Add(new StreamContent(testViewModel.File.OpenReadStream()), "File",   Path.GetFileName(testViewModel.File.FileName));
            var response =  hc.PostAsync(url,formContent).Result;
            return Ok();
         }