diff --git a/VisualCard.Calendar/Parts/Calendar.cs b/VisualCard.Calendar/Parts/Calendar.cs
index 61e414eb..4919c7f9 100644
--- a/VisualCard.Calendar/Parts/Calendar.cs
+++ b/VisualCard.Calendar/Parts/Calendar.cs
@@ -19,6 +19,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
@@ -97,6 +98,24 @@ public class Calendar : IEquatable<Calendar>
         public CalendarOtherComponent[] Others =>
             [.. others];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public virtual ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public virtual ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public virtual ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarAlarm.cs b/VisualCard.Calendar/Parts/CalendarAlarm.cs
index cddb4c4c..a627db13 100644
--- a/VisualCard.Calendar/Parts/CalendarAlarm.cs
+++ b/VisualCard.Calendar/Parts/CalendarAlarm.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -36,6 +38,24 @@ public class CalendarAlarm : Calendar, IEquatable<CalendarAlarm>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarDaylight.cs b/VisualCard.Calendar/Parts/CalendarDaylight.cs
index da775f5b..6ed1a1a6 100644
--- a/VisualCard.Calendar/Parts/CalendarDaylight.cs
+++ b/VisualCard.Calendar/Parts/CalendarDaylight.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -36,6 +38,24 @@ public class CalendarDaylight : Calendar, IEquatable<CalendarDaylight>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarEvent.cs b/VisualCard.Calendar/Parts/CalendarEvent.cs
index f7e40112..cf70ded4 100644
--- a/VisualCard.Calendar/Parts/CalendarEvent.cs
+++ b/VisualCard.Calendar/Parts/CalendarEvent.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -37,6 +39,24 @@ public class CalendarEvent : Calendar, IEquatable<CalendarEvent>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Alarm list
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarFreeBusy.cs b/VisualCard.Calendar/Parts/CalendarFreeBusy.cs
index ecdd039a..e238111a 100644
--- a/VisualCard.Calendar/Parts/CalendarFreeBusy.cs
+++ b/VisualCard.Calendar/Parts/CalendarFreeBusy.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -36,6 +38,24 @@ public class CalendarFreeBusy : Calendar, IEquatable<CalendarFreeBusy>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarJournal.cs b/VisualCard.Calendar/Parts/CalendarJournal.cs
index b7ebeec6..dba8953e 100644
--- a/VisualCard.Calendar/Parts/CalendarJournal.cs
+++ b/VisualCard.Calendar/Parts/CalendarJournal.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -36,6 +38,24 @@ public class CalendarJournal : Calendar, IEquatable<CalendarJournal>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarOtherComponent.cs b/VisualCard.Calendar/Parts/CalendarOtherComponent.cs
index 00e81ca3..77c7c750 100644
--- a/VisualCard.Calendar/Parts/CalendarOtherComponent.cs
+++ b/VisualCard.Calendar/Parts/CalendarOtherComponent.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -37,6 +39,24 @@ public class CalendarOtherComponent : Calendar, IEquatable<CalendarOtherComponen
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Component name
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarStandard.cs b/VisualCard.Calendar/Parts/CalendarStandard.cs
index 308d3f2f..cbedd95b 100644
--- a/VisualCard.Calendar/Parts/CalendarStandard.cs
+++ b/VisualCard.Calendar/Parts/CalendarStandard.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -36,6 +38,24 @@ public class CalendarStandard : Calendar, IEquatable<CalendarStandard>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarTimeZone.cs b/VisualCard.Calendar/Parts/CalendarTimeZone.cs
index 277a1087..f268d372 100644
--- a/VisualCard.Calendar/Parts/CalendarTimeZone.cs
+++ b/VisualCard.Calendar/Parts/CalendarTimeZone.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -38,6 +40,24 @@ public class CalendarTimeZone : Calendar, IEquatable<CalendarTimeZone>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Standard time list
         /// </summary>
diff --git a/VisualCard.Calendar/Parts/CalendarTodo.cs b/VisualCard.Calendar/Parts/CalendarTodo.cs
index 736c2b17..ce00c90f 100644
--- a/VisualCard.Calendar/Parts/CalendarTodo.cs
+++ b/VisualCard.Calendar/Parts/CalendarTodo.cs
@@ -19,7 +19,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.Linq;
 using VisualCard.Calendar.Parsers;
 using VisualCard.Calendar.Parts.Comparers;
 using VisualCard.Calendar.Parts.Enums;
@@ -37,6 +39,24 @@ public class CalendarTodo : Calendar, IEquatable<CalendarTodo>
         private readonly Dictionary<CalendarStringsEnum, List<CalendarValueInfo<string>>> strings = [];
         private readonly Dictionary<CalendarIntegersEnum, List<CalendarValueInfo<double>>> integers = [];
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarPartsArrayEnum, ReadOnlyCollection<BaseCalendarPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarStringsEnum, ReadOnlyCollection<CalendarValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// Integer list in a dictionary (for enumeration operations)
+        /// </summary>
+        public override ReadOnlyDictionary<CalendarIntegersEnum, ReadOnlyCollection<CalendarValueInfo<double>>> Integers =>
+            new(integers.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Alarm list
         /// </summary>
diff --git a/VisualCard/Parts/Card.cs b/VisualCard/Parts/Card.cs
index 0aed99f6..32ebe07d 100644
--- a/VisualCard/Parts/Card.cs
+++ b/VisualCard/Parts/Card.cs
@@ -19,6 +19,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
@@ -72,6 +73,18 @@ public class Card : IEquatable<Card>
         public CardKind CardKind =>
             VcardCommonTools.GetKindEnum(CardKindStr);
 
+        /// <summary>
+        /// Part array list in a dictionary (for enumeration operations)
+        /// </summary>
+        public ReadOnlyDictionary<PartsArrayEnum, ReadOnlyCollection<BaseCardPartInfo>> PartsArray =>
+            new(partsArray.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
+        /// <summary>
+        /// String list in a dictionary (for enumeration operations)
+        /// </summary>
+        public ReadOnlyDictionary<StringsEnum, ReadOnlyCollection<CardValueInfo<string>>> Strings =>
+            new(strings.ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value.AsReadOnly()));
+
         /// <summary>
         /// Gets a part array from a specified key
         /// </summary>