Implement SessionService, SessionItem; improvements, fixes, etc...

Mango.Nop.Services/IMgSessionItem.cs

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+namespace Mango.Nop.Services;
+
+public interface IMgSessionItem
+{
+    string SessionId { get; }
+    int RequestCount { get; set; }
+}

Mango.Nop.Services/IMgSessionService.cs

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+using System.Collections.Concurrent;
+
+namespace Mango.Nop.Services;
+
+public interface IMgSessionService<TSessionItem> where TSessionItem : IMgSessionItem
+{
+    //public ConcurrentDictionary<string, TSessionItem> Sessions { get; }
+
+    public TSessionItem? GetOrCreateSessionItem(string sessionId);
+    public bool TryAddSessionItem(TSessionItem sessionItem);
+    public bool TryGetSessionItem(string sessionId, out TSessionItem sessionItem);
+    public bool TryRemoveSessionItem(string sessionId, out TSessionItem sessionItem);
+    public int Count();
+}

Mango.Nop.Services/MgSessionItem.cs

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+namespace Mango.Nop.Services;
+
+public abstract class MgSessionItem(string sessionKey) : IMgSessionItem
+{
+    public string SessionId { get; protected set; } = sessionKey;
+    public int RequestCount { get; set; }
+}

Mango.Nop.Services/MgSessionService.cs

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+using System.Collections.Concurrent;
+using AyCode.Utils.Extensions;
+
+namespace Mango.Nop.Services;
+
+public abstract class MgSessionService<TSessionItem> : IMgSessionService<TSessionItem> where TSessionItem : class, IMgSessionItem
+{
+    protected ConcurrentDictionary<string, TSessionItem> Sessions { get; } = new();
+
+    public bool TryGetSessionItem(string sessionId, out TSessionItem sessionItem)
+    {
+        return Sessions.TryGetValue(sessionId, out sessionItem!);
+    }
+
+    public TSessionItem? GetOrCreateSessionItem(string sessionId)
+    {
+        if (Sessions.TryGetValue(sessionId, out var sessionItem)) return sessionItem;
+
+        if (sessionId.IsNullOrWhiteSpace()) throw new NullReferenceException("sessionId.IsNullOrWhiteSpace()");
+
+        sessionItem = Activator.CreateInstance(typeof(TSessionItem), sessionId) as TSessionItem;
+        if (sessionItem == null) throw new NullReferenceException($"sessionItem == null); sessionId: {sessionId}");
+
+        return Sessions.TryAdd(sessionId, sessionItem) ? sessionItem : null;
+    }
+
+    public bool TryAddSessionItem(TSessionItem sessionItem)
+    {
+        if (sessionItem.SessionId.IsNullOrWhiteSpace() || Sessions.ContainsKey(sessionItem.SessionId)) throw new NullReferenceException($"(sessionItem.SessionKey.IsNullOrWhiteSpace() || Sessions.ContainsKey(sessionItem.SessionKey)); sessionId: {sessionItem?.SessionId};");
+
+        return Sessions.TryAdd(sessionItem.SessionId, sessionItem);
+    }
+
+    public bool TryRemoveSessionItem(string sessionId, out TSessionItem sessionItem)
+    {
+        return Sessions.TryRemove(sessionId, out sessionItem!);
+    }
+
+    public int Count() => Sessions.Count;
+}