public IActionResult GetCaptcha() { // 验证码的值 var code = _captchaHelper.GetValidateCode(); // 生成验证码图片流 var stream = _captchaHelper.CreateImageStream(code); // 保存到缓存 // todo 整理缓存服务,配置化过期时间 var codeId = Guid.NewGuid().ToString(); _memoryCache.Set(codeId, code, new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(2))); // 将id保存到header返回客户端 Response.Headers.Add(CommonConstants.CaptchaCodeId, codeId.ToString()); return(File(stream.ToArray(), @"image/png")); }