fixed bug - Service unavailable upon clicking back to HeatNettworkType page (#270)

Author: SushreeM-DESNZ

HNTAS/HNTAS.Web.UI/Controllers/HeatNetworkController.cs

@@ -604,10 +604,11 @@ public async Task<IActionResult> NetworkDetails()
         [HttpGet]
         public async Task<IActionResult> SelectNetworkDetail([FromQuery] string hnid, [FromQuery] NetworkDetailsType networkDetailId)
         {
+            _sessionHelper.SaveToSession<string>(HttpContext, SessionKeys.HnId, hnid.ToUpper());
             switch (networkDetailId)
             {
                 case NetworkDetailsType.NetworkCharacteristics:
-                    return RedirectToAction("HeatNetworkType", "NetworkCharacteristics", new { hnid });
+                    return RedirectToAction("HeatNetworkType", "NetworkCharacteristics");
                 case NetworkDetailsType.NetworkElements:
                     return RedirectToAction("SelectNetworkElements", "NetworkElements", new { hnid });
                 default:

HNTAS/HNTAS.Web.UI/Controllers/NetworkCharacteristicsController.cs

@@ -20,12 +20,11 @@ public NetworkCharacteristicsController(ISessionHelper sessionHelper, IHeatNetwo
         }
 
         [HttpGet]
-        public IActionResult HeatNetworkType(string hnid)
+        public IActionResult HeatNetworkType()
         {
             this.ShowBackButton("NetworkDetails", "HeatNetwork");
-
-            _sessionHelper.SaveToSession<string>(HttpContext, SessionKeys.HnId, hnid.ToUpper());
-            TempData["HnId"] = hnid.ToUpper();
+            var hnId = _sessionHelper.GetFromSession<string>(HttpContext, SessionKeys.HnId);
+            TempData["HnId"] = hnId;
             var model = _sessionHelper.GetFromSession<HeatNetworkTypeViewModel>(HttpContext, SessionKeys.HeatNetworkTypeViewModelSessionKey) ?? new HeatNetworkTypeViewModel { HeatNetworkTypes = Helpers.Utility.GetHeatNetworkTypeOptions() };
             return View(model);
         }