public class ImgController : ControllerBase
    {
        private readonly IHostEnvironment _environment;

        public ImgController(IHostEnvironment environment)
        {
            _environment = environment;
        }
        /// <summary>
        /// 上传图片
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        [HttpPost]
        public async Task<IActionResult> UploadFiles(IFormFile file)
        {
            if (file == null) return new OkObjectResult("请选择你要上传的图片!");

            var images = new string[] { ".png", ".gif", ".jpg", ".bmp", ".jpeg" };

            if (!images.Any(x => file.FileName.EndsWith(x))) return new OkObjectResult("上传图片格式有误!");

            if (file.Length > 10 * 1024 * 1024) return new OkObjectResult("图片大小不可大于10MB!");

            string fileExt = file.FileName.Substring(file.FileName.LastIndexOf('.')); //文件扩展名

            string newFileName = Guid.NewGuid().ToString("N") + fileExt;

            var filePath = Path.Combine(_environment.ContentRootPath + "/wwwroot/imgs/" + newFileName) ;

            //判断当前路径是否存在
            if (!Directory.Exists(filePath))
            {

                using var stream = new FileStream(filePath, FileMode.Create);

                file.CopyTo(stream);

                stream.Flush();

                return new OkObjectResult("上传成功!");
            }
            return BadRequest("上传失败,服务器内部错误!");
        }
    }