//这种是通过请求具体的文件
            app.UseStaticFiles(new StaticFileOptions()
            {
                FileProvider = new PhysicalFileProvider(
                    Path.Combine(Directory.GetCurrentDirectory(), @"Log")
                    ),
                RequestPath = new PathString("/MyLog")
            });

            //通过浏览器访问项目下的文件夹
            app.UseDirectoryBrowser(new DirectoryBrowserOptions()
            {
                FileProvider = new PhysicalFileProvider(
                    Path.Combine(Directory.GetCurrentDirectory(), @"Log")
                    ),
                RequestPath = new PathString("/MyLog")

            });

 services.AddDirectoryBrowser();