public CaptchaResultModel GetCaptcha()
{
var randomValue = CaptchaHelper.GetValidateCode(5);
var imageData = CaptchaHelper.CreateBase64Image(randomValue);
var key = Guid.NewGuid().ToString();
_cachingProvider.Set(key, randomValue, TimeSpan.FromMinutes(2));
return(new CaptchaResultModel(key, imageData));
}
public async Task <CaptchaResultModel> GetCaptcha()
{
var randomValue = CaptchaHelper.GetValidateCode(5);
var imageData = CaptchaHelper.CreateBase64Image(randomValue);
var key = Guid.NewGuid().ToString();
await _cachingProvider.SetAsync(key, randomValue, TimeSpan.FromMinutes(2));
return(new CaptchaResultModel
{
CaptchaKey = key,
CaptchaData = imageData
});
}
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"));
}