update

TEAMModelOS.Extension/IES.Exam/IES.ExamServer/Controllers/IndexController.cs

@@ -346,7 +346,7 @@ namespace IES.ExamServer.Controllers
                             string content = $"{CenterUrl}/qrcodelogin?randomcode=Login:ExamServer:{school?.id}:{randomcode}&m=%E6%89%AB%E7%A0%81%E7%99%BB%E5%BD%95&o=1";
                             var str = QRCodeHelper.GenerateQRCode(content, 300, 300, QRCodeHelper.logo);
                             qrcode = $"data:image/png;base64,{str}";
-                            int ttl = 60;
+                            int ttl = 180;
                             string  key = $"Login:ExamServer:{school?.id}:{randomcode}";
                             _memoryCache.Set(key, randomcode, TimeSpan.FromSeconds(ttl));
                             var device =IndexService.GetDevice(HttpContext,_memoryCache);