public IActionResult SaveMark(IFormFile file) { if (file == null || !file.IsImage()) { AjaxData.Message = "请选择图片文件"; return(Json(AjaxData)); } using (var stream = file.OpenReadStream()) { _markLogoService.SaveStream(stream); AjaxData.Message = "保存成功"; AjaxData.Success = true; return(Json(AjaxData)); } }