Merge branch 'master' of http://www.scserverddns.top:13000/sc/SunlightAggregationManager

ViewModel/MainWindowViewModel.cs

@@ -324,9 +324,14 @@ namespace SunlightAggregationManager.ViewModel
             {
                 lock (DB)
                 {
-                    DataRow drEmployee = DB.Select(key).First();
-                    object? index = drEmployee.Field<object>(name);
-                    return index;
+                    DataRow[] dataRows = DB.Select(key);
+                    if (dataRows.Count() > 0)
+                    {
+                        DataRow drEmployee = dataRows.First();
+                        object? index = drEmployee.Field<object>(name);
+                        return index;
+                    }
+                    else { return null; }
                 }
             }
             catch (Exception ex)