* update before changing

  Submodels management

Author: festo-i40

src/AasxCsharpLibrary/AdminShellBasicExtensions.cs

@@ -36,6 +36,14 @@ public static bool HasContent(this string str)
             return str != null && str.Trim() != "";
         }
 
+        public static IEnumerable<T> ForEachSafe<T>(this List<T> list)
+        {
+            if (list == null)
+                yield break;
+            foreach (var x in list)
+                yield return x;
+        }
+
         /// <summary>
         /// Multiple a string into a iterable list
         /// </summary>

src/AasxPackageExplorer/options-debug.MIHO.json

@@ -32,8 +32,9 @@
   // "AasxToLoad": "C:\\HOMI\\Develop\\Aasx\\repo\\Test1.aasx",
   // "AasxToLoad": "C:\\HOMI\\Develop\\Aasx\\repo\\samm-test\\SMT_and_SAMM_Showcase_v02.aasx",
   // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\SMT_TechData_Work\\IDTA 02003-1-2_SubmodelTemplate_TechnicalData_v1.3_workingFile_MIHO.aasx",
-  "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\f.aasx",
-  // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\SMT_and_SAMM_Showcase_v02_spiel.aasx",
+  // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\f.aasx",
+  // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\SMT_and_SAMM_Showcase_v02.aasx",
+  "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\nearnull.aasx",
   // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\SMT_ProductChangeNotification_Draft_v19_spiel.aasx",
   // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\00_FestoDemoBox-Module-2-Kopie.aasx",
   // "AasxToLoad": "C:\\Users\\homi0002\\Desktop\\tmp\\8001203_SPAU-P10R-T-R18M-L-PNLK-PNVBA-M8D_060ff64f-9fd2-422d-81ce-b17e49f007c5_work_spiel.aasx",

src/AasxPackageLogic/DispEditHelperEntities.cs

@@ -2264,6 +2264,18 @@ public void DisplayOrEditAasEntitySubmodelOrRef(
                 }
             }
 
+            //
+            // Submodel Value
+            //
+
+            if (submodel != null)
+            {
+                this.AddGroup(stack, "Submodel elements", this.levelColors.MainSection);
+                if (submodel.SubmodelElements != null)
+                    this.AddKeyValue(stack, "# of elements", "" + submodel.SubmodelElements.Count);
+                else
+                    this.AddKeyValue(stack, "Elements", "Please add elements via editing of sub-ordinate entities");
+            }
         }
 
         //

src/AasxPackageLogic/DispEditHelperModules.cs

@@ -401,7 +401,7 @@ public void DisplayOrEditEntityIdentifiable(AnyUiStackPanel stack,
                 new HintCheck(
                     () => {
                         int count = 0;
-                        foreach(var aas in env.AssetAdministrationShells)
+                        foreach(var aas in env.AssetAdministrationShells.ForEachSafe())
                         {
                             if(aas.Id == identifiable.Id)
                                 count++;

src/AasxPackageLogic/MainWindowScripting.cs

@@ -113,7 +113,7 @@ public enum ScriptSelectAdressMode { None = 0, First, Next, Prev, idShort, seman
                 {
                     if (siAAS?.theAas != null)
                     {
-                        var smr = siAAS.theAas.Submodels.FirstOrDefault();
+                        var smr = siAAS.theAas.Submodels?.FirstOrDefault();
                         var sm = pm.FindSubmodel(smr);
                         if (sm == null)
                         {
@@ -125,7 +125,7 @@ public enum ScriptSelectAdressMode { None = 0, First, Next, Prev, idShort, seman
 
                     if (firstAas != null)
                     {
-                        var smr = firstAas.Submodels.FirstOrDefault();
+                        var smr = firstAas.Submodels?.FirstOrDefault();
                         var sm = pm.FindSubmodel(smr);
                         if (sm == null)
                         {

src/AasxPackageLogic/VisualAasxElements.cs

@@ -2145,7 +2145,7 @@ private void GenerateInnerElementsForConceptDescriptions(
 						tiSubmodelsRoot.Members.Add(tiSM);
 
 						// now list CDs here
-						foreach (var cd in env.ConceptDescriptions)
+						foreach (var cd in env.ConceptDescriptions.ForEachSafe())
                         {
 							if (!_cdToSm.ContainsKey(cd))
 								continue;