/// Example: "00001.00042.00005".

/// Example: "00001.00042.00006".

    public class OrganizationalUnit : TrackableEntity<User>, IHasRowVersion, IPassivable
    {
        #region Constants

        /// <summary>
        /// Maximum depth of an UO hierarchy.
        /// </summary>
        public const int MaxDepth = 16;

        /// <summary>
        /// Length of a code unit between dots.
        /// </summary>
        public const int PathUnitLength = 5;

        /// <summary>
        /// Maximum length of the <see cref="Path"/> property.
        /// </summary>
        public const int MaxPathLength = MaxDepth * (PathUnitLength + 1) - 1;

        public const char HierarchicalDisplayNameSeperator = '»';

        #endregion

        #region Properties

        public string Name { get; set; }
        public string NormalizedName { get; set; }
        public string HierarchicalDisplayName { get; set; }
        /// <summary>
        /// Hierarchical Path of this organization unit.
        /// Example: "00001.00042.00005".
        /// It's changeable if OU hierarch is changed.
        /// </summary>
        public string Path { get; set; }
        public bool IsActive { get; set; } = true;
        public byte[] RowVersion { get; set; }

        #endregion

        #region Navigation Properties

        public OrganizationalUnit Parent { get; set; }
        public long? ParentId { get; set; }
        public ICollection<OrganizationalUnit> Children { get; set; } = new HashSet<OrganizationalUnit>();
        public ICollection<UserOrganizationalUnit> UserOrganizationalUnits { get; set; } =
            new HashSet<UserOrganizationalUnit>();

        #endregion

        #region Public Methods

        /// <summary>
        /// Creates path for given numbers.
        /// Example: if numbers are 4,2 then returns "00004.00002";
        /// </summary>
        /// <param name="numbers">Numbers</param>
        public static string CreatePath(params int[] numbers)
        {
            if (numbers.IsNullOrEmpty())
            {
                return null;
            }

            return numbers.Select(number => number.ToString(new string('0', PathUnitLength))).JoinAsString(".");
        }

        /// <summary>
        /// Appends a child path to a parent path. 
        /// Example: if parentPath = "00001", childPath = "00042" then returns "00001.00042".
        /// </summary>
        /// <param name="parentPath">Parent path. Can be null or empty if parent is a root.</param>
        /// <param name="childPath">Child path.</param>
        public static string AppendPath(string parentPath, string childPath)
        {
            if (childPath.IsNullOrEmpty())
            {
                throw new ArgumentNullException(nameof(childPath), "childPath can not be null or empty.");
            }

            if (parentPath.IsNullOrEmpty())
            {
                return childPath;
            }

            return parentPath + "." + childPath;
        }

        /// <summary>
        /// Gets relative path to the parent.
        /// Example: if path = "00019.00055.00001" and parentPath = "00019" then returns "00055.00001".
        /// </summary>
        /// <param name="path">The path.</param>
        /// <param name="parentPath">The parent path.</param>
        public static string GetRelativePath(string path, string parentPath)
        {
            if (path.IsNullOrEmpty())
            {
                throw new ArgumentNullException(nameof(path), "Path can not be null or empty.");
            }

            if (parentPath.IsNullOrEmpty())
            {
                return path;
            }

            if (path.Length == parentPath.Length)
            {
                return null;
            }

            return path.Substring(parentPath.Length + 1);
        }

        /// <summary>
        /// Calculates next path for given path.
        /// Example: if code = "00019.00055.00001" returns "00019.00055.00002".
        /// </summary>
        /// <param name="path">The path.</param>
        public static string CalculateNextPath(string path)
        {
            if (path.IsNullOrEmpty())
            {
                throw new ArgumentNullException(nameof(path), "Path can not be null or empty.");
            }

            var parentPath = GetParentPath(path);
            var lastUnitPath = GetLastUnitPath(path);

            return AppendPath(parentPath, CreatePath(Convert.ToInt32(lastUnitPath) + 1));
        }

        /// <summary>
        /// Gets the last unit path.
        /// Example: if path = "00019.00055.00001" returns "00001".
        /// </summary>
        /// <param name="path">The path.</param>
        public static string GetLastUnitPath(string path)
        {
            if (path.IsNullOrEmpty())
            {
                throw new ArgumentNullException(nameof(path), "Path can not be null or empty.");
            }

            var splittedPath = path.Split('.');
            return splittedPath[splittedPath.Length - 1];
        }

        /// <summary>
        /// Gets parent path.
        /// Example: if path = "00019.00055.00001" returns "00019.00055".
        /// </summary>
        /// <param name="path">The path.</param>
        public static string GetParentPath(string path)
        {
            if (path.IsNullOrEmpty())
            {
                throw new ArgumentNullException(nameof(path), "Path can not be null or empty.");
            }

            var splittedPath = path.Split('.');
            if (splittedPath.Length == 1)
            {
                return null;
            }

            return splittedPath.Take(splittedPath.Length - 1).JoinAsString(".");
        }

        #endregion
    }

       public virtual async Task<string> GetNextChildPathAsync(long? parentId)
        {
            var lastChild = await GetLastChildOrNullAsync(parentId).ConfigureAwait(false);
            if (lastChild == null)
            {
                var parentPath = parentId != null ? await GetPathAsync(parentId.Value).ConfigureAwait(false) : null;
                return OrganizationalUnit.AppendPath(parentPath, OrganizationalUnit.CreatePath(1));
            }

            return OrganizationalUnit.CalculateNextPath(lastChild.Path);
        }

        public async Task<string> GetNextChildHierarchicalDisplayNameAsync(string name, long? parentId)
        {
            var parent = parentId != null
                ? await _organizationalUnits.SingleOrDefaultAsync(a => a.Id == parentId.Value).ConfigureAwait(false)
                : null;

            return parent == null
                ? name
                : $"{parent.HierarchicalDisplayName} {OrganizationalUnit.HierarchicalDisplayNameSeperator} {name}";
        }

        public virtual async Task<OrganizationalUnit> GetLastChildOrNullAsync(long? parentId)
        {
            return await _organizationalUnits.OrderByDescending(c => c.Path)
                .FirstOrDefaultAsync(ou => ou.ParentId == parentId).ConfigureAwait(false);
        }

        public virtual async Task<string> GetPathAsync(long id)
        {
            Guard.ArgumentNotZero(id, nameof(id));
            var organizationalUnit = await _organizationalUnits.SingleOrDefaultAsync(ou => ou.Id == id).ConfigureAwait(false);
            if (organizationalUnit == null)
            {
                throw new KeyNotFoundException();
            }
            return organizationalUnit.Path;
        }

        public async Task<List<OrganizationalUnit>> FindChildrenAsync(long? parentId, bool recursive = false)
        {
            if (!recursive)
            {
                return await _organizationalUnits.Where(ou => ou.ParentId == parentId).ToListAsync().ConfigureAwait(false);
            }

            if (!parentId.HasValue)
            {
                return await _organizationalUnits.ToListAsync().ConfigureAwait(false);
            }

            var path = await GetPathAsync(parentId.Value).ConfigureAwait(false);

            return await _organizationalUnits.Where(
                ou => ou.Path.StartsWith(path) && ou.Id != parentId.Value).ToListAsync().ConfigureAwait(false);
        }

        public virtual async Task MoveAsync(long id, long? parentId)
        {
            Guard.ArgumentNotZero(id, nameof(id));
            var organizationalUnit = await _organizationalUnits.SingleOrDefaultAsync(ou => ou.Id == id).ConfigureAwait(false);
            if (organizationalUnit == null || organizationalUnit.ParentId == parentId)
            {
                return;
            }

            //Should find children before Path change
            var children = await FindChildrenAsync(id, true).ConfigureAwait(false);

            //Store old Path of OU
            var oldPath = organizationalUnit.Path;

            //Move OU
            organizationalUnit.Path = await GetNextChildPathAsync(parentId).ConfigureAwait(false);
            organizationalUnit.ParentId = parentId;

            //Update Children Paths
            foreach (var child in children)
            {
                child.Path = OrganizationalUnit.AppendPath(organizationalUnit.Path, OrganizationalUnit.GetRelativePath(child.Path, oldPath));
            }
        }

public class BaseEntity : IBaseEntity
{
   [JsonIgnore]
   int Id { get; set; } 

   [JsonIgnore] 
    string? Audit { get; set; }
}

public class AuditSourceValues
{
    [JsonProperty("hn")]
    public string? HostName { get; set; }

    [JsonProperty("mn")]
    public string? MachineName { get; set; }

    [JsonProperty("rip")]
    public string? RemoteIpAddress { get; set; }

    [JsonProperty("lip")]
    public string? LocalIpAddress { get; set; }

    [JsonProperty("ua")]
    public string? UserAgent { get; set; }

    [JsonProperty("an")]
    public string? ApplicationName { get; set; }

    [JsonProperty("av")]
    public string? ApplicationVersion { get; set; }

    [JsonProperty("cn")]
    public string? ClientName { get; set; }

    [JsonProperty("cv")]
    public string? ClientVersion { get; set; }

    [JsonProperty("o")]
    public string? Other { get; set; }
}

public class EntityAudit<TEntity>
{
    [JsonProperty("type")]
    [JsonConverter(typeof(StringEnumConverter))]
    public EntityEventType EventType { get; set; }

    [JsonProperty("user", NullValueHandling = NullValueHandling.Include)]
    public int? ActorUserId { get; set; }

    [JsonProperty("at")]
    public DateTime ActDateTime { get; set; }

    [JsonProperty("sources")]
    public AuditSourceValues? AuditSourceValues { get; set; }

    [JsonProperty("newValues", NullValueHandling = NullValueHandling.Include)]
    public TEntity NewEntity { get; set; } = default!;

    public string? SerializeJson()
    {
        return JsonSerializer.Serialize(this, 
            options: new JsonSerializerOptions { WriteIndented = false, IgnoreNullValues = true }); 
    }
}

public enum EntityEventType
{
    Create = 0,
    Update = 1,
    Delete = 2
}

public interface IAuditSourcesProvider
{
    AuditSourceValues GetAuditSourceValues();
}

public class AuditSourcesProvider : IAuditSourcesProvider
{
    protected readonly IHttpContextAccessor HttpContextAccessor;

    public AuditSourcesProvider(IHttpContextAccessor httpContextAccessor)
    {
        HttpContextAccessor = httpContextAccessor;
    }

    public virtual AuditSourceValues GetAuditSourceValues()
    {
        var httpContext = HttpContextAccessor.HttpContext;

        return new AuditSourceValues
        {
            HostName = GetHostName(httpContext),
            MachineName = GetComputerName(httpContext),
            LocalIpAddress = GetLocalIpAddress(httpContext),
            RemoteIpAddress = GetRemoteIpAddress(httpContext),
            UserAgent = GetUserAgent(httpContext),
            ApplicationName = GetApplicationName(httpContext),
            ClientName = GetClientName(httpContext),
            ClientVersion = GetClientVersion(httpContext),
            ApplicationVersion = GetApplicationVersion(httpContext),
            Other = GetOther(httpContext)
        };
    }

    protected virtual string? GetUserAgent(HttpContext httpContext)
    {
        return httpContext.Request?.Headers["User-Agent"].ToString();
    }

    protected virtual string? GetRemoteIpAddress(HttpContext httpContext)
    {
        return httpContext.Connection?.RemoteIpAddress?.ToString();
    }

    protected virtual string? GetLocalIpAddress(HttpContext httpContext)
    {
        return httpContext.Connection?.LocalIpAddress?.ToString();
    }

    protected virtual string GetHostName(HttpContext httpContext)
    {
        return httpContext.Request.Host.ToString();
    }

    protected virtual string GetComputerName(HttpContext httpContext)
    {
        return Environment.MachineName;
    }
    protected virtual string? GetApplicationName(HttpContext httpContext)
    {
        return Assembly.GetEntryAssembly()?.GetName().Name;
    }

    protected virtual string? GetApplicationVersion(HttpContext httpContext)
    {
        return Assembly.GetEntryAssembly()?.GetName().Version.ToString();
    }

    protected virtual string? GetClientVersion(HttpContext httpContext)
    {
        return httpContext.Request?.Headers["client-version"];
    }
    protected virtual string? GetClientName(HttpContext httpContext)
    {
        return httpContext.Request?.Headers["client-name"];
    }

    protected virtual string? GetOther(HttpContext httpContext)
    {
        return null;
    }
}

public interface IEntityAuditProvider
{
    string? GetAuditValues(EntityEventType eventType, object? entity, string? previousJsonAudit = null);
}

public class EntityAuditProvider : IEntityAuditProvider
{
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly IAuditSourcesProvider _auditSourcesProvider;

    #region Constructor Injections

    public EntityAuditProvider(IHttpContextAccessor httpContextAccessor, IAuditSourcesProvider auditSourcesProvider)
    {
        _httpContextAccessor = httpContextAccessor;
        _auditSourcesProvider = auditSourcesProvider;
    }

    #endregion

    public virtual string? GetAuditValues(EntityEventType eventType, object? newEntity, string? previousJsonAudit = null)
    {
        var httpContext = _httpContextAccessor.HttpContext;
        int? userId;

        var user = httpContext.User;

        if (!user.Identity.IsAuthenticated)
            userId = null;
        else
            userId = user.Claims.Where(x => x.Type == "UserID").Select(x => x.Value).First().ToInt();

        var auditSourceValues = _auditSourcesProvider.GetAuditSourceValues();

        var auditJArray = new JArray();

        // Update & Delete
        if (eventType == EntityEventType.Update || eventType == EntityEventType.Delete)
        {
            auditJArray = JArray.Parse(previousJsonAudit!);
        }

        // Delete => No NewValues
        if (eventType == EntityEventType.Delete)
        {
            newEntity = null;
        }

        JObject newAuditJObject = JObject.FromObject(new EntityAudit<object?>
        {
            EventType = eventType,
            ActorUserId = userId,
            ActDateTime = DateTime.Now,
            AuditSourceValues = auditSourceValues,
            NewEntity = newEntity
        }, new JsonSerializer
        {
            NullValueHandling = NullValueHandling.Ignore,
            Formatting = Formatting.None
        });

        auditJArray.Add(newAuditJObject);

        return auditJArray.SerializeToJson(true);
    }
}

public class AuditSaveChangesInterceptor : SaveChangesInterceptor
{
    private readonly IEntityAuditProvider _entityAuditProvider;

    #region Constructor Injections

    public AuditSaveChangesInterceptor(IEntityAuditProvider entityAuditProvider)
    {
        _entityAuditProvider = entityAuditProvider;
    }

    #endregion

    public override InterceptionResult<int> SavingChanges(DbContextEventData eventData, InterceptionResult<int> result)
    {
        ApplyAudits(eventData.Context.ChangeTracker);
        return base.SavingChanges(eventData, result);
    }

    public override ValueTask<InterceptionResult<int>> SavingChangesAsync(DbContextEventData eventData, InterceptionResult<int> result,
        CancellationToken cancellationToken = new CancellationToken())
    {
        ApplyAudits(eventData.Context.ChangeTracker);
        return base.SavingChangesAsync(eventData, result, cancellationToken);
    }

    private void ApplyAudits(ChangeTracker changeTracker)
    {
        ApplyCreateAudits(changeTracker);
        ApplyUpdateAudits(changeTracker);
        ApplyDeleteAudits(changeTracker);
    }

    private void ApplyCreateAudits(ChangeTracker changeTracker)
    {
        var addedEntries = changeTracker.Entries()
            .Where(x => x.State == EntityState.Added);

        foreach (var addedEntry in addedEntries)
        {
            if (addedEntry.Entity is IBaseEntity entity)
            {              
                entity.Audit = _entityAuditProvider.GetAuditValues(EntityEventType.Create, entity);
            }
        }
    }

    private void ApplyUpdateAudits(ChangeTracker changeTracker)
    {
        var modifiedEntries = changeTracker.Entries()
            .Where(x => x.State == EntityState.Modified);

        foreach (var modifiedEntry in modifiedEntries)
        {
            if (modifiedEntry.Entity is IBaseEntity entity)
            {
                var eventType = entity.IsArchived ? EntityEventType.Delete : EntityEventType.Update; // Maybe Soft Delete
                entity.Audit = _entityAuditProvider.GetAuditValues(eventType, entity, entity.Audit);
            }
        }
    }

    private void ApplyDeleteAudits(ChangeTracker changeTracker)
    {
        var deletedEntries = changeTracker.Entries()
            .Where(x => x.State == EntityState.Deleted);

        foreach (var modifiedEntry in deletedEntries)
        {
            if (modifiedEntry.Entity is IBaseEntity entity)
            {
                entity.Audit = _entityAuditProvider.GetAuditValues(EntityEventType.Delete, entity, entity.Audit);
            }
        }
    }

}

services.AddDbContext<ATADbContext>((serviceProvider, options) =>
{
    options
        .UseSqlServer(...)

    // Interceptors
    var entityAuditProvider = serviceProvider.GetRequiredService<IEntityAuditProvider>();
    options.AddInterceptors(new AuditSaveChangesInterceptor(entityAuditProvider));

});

[
   {
      "type":"Create",
      "user":1,
      "at":"2020-11-24T23:05:54.2692711+03:30",
      "sources":{
         "hn":"localhost:44398",
         "mn":"DESKTOP-N1GAV2U",
         "rip":"::1",
         "lip":"::1",
         "ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36",
         "an":"Server.Api",
         "av":"1.0.0.0"
      },
      "newValues":{               
         "Name":"Farshad"
      }
   },
   {
      "type":"Update",
      "user":1,
      "at":"2020-11-24T23:06:20.0838188+03:30",
      "sources":{
         "hn":"localhost:44398",
         "mn":"DESKTOP-N1GAV2U",
         "rip":"::1",
         "lip":"::1",
         "ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36",
         "an":"Server.Api",
         "av":"1.0.0.0"
      },
      "newValues":{                 
         "Name":"Edited Farshad"
      }
   },
   {
      "type":"Delete",
      "user":null,
      "at":"2020-11-24T23:06:28.601837+03:30",
      "sources":{
         "hn":"localhost:44398",
         "mn":"DESKTOP-N1GAV2U",
         "rip":"::1",
         "lip":"::1",
         "ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36",
         "an":"Server.Api",
         "av":"1.0.0.0"
      },
      "newValues":null
   }
]

<div id="CrudPanel" class="row treeview-panel" >
      <div class="col-lg-7 pull-right">
           <input type="text" id="txtLocationTitle" class="form-control" />
      </div>
      <div class="col-lg-5 pull-left" style="text-align: left;">
           <button data-toggle="tooltip" data-placement="left" title="افزودن" id="btnAddLocation" class="btn btn-sm btn-success">
                <i class="fa fa-plus"></i>
           </button>
           <button data-toggle="tooltip" data-placement="left" title="عدم انتخاب" id="btnUnSelect" class="btn btn-sm btn-info">
                <i class="fa fa-square-o"></i>
           </button>
           <button data-toggle="tooltip" data-placement="left" title="ویرایش" id="btnEditLocation" class="btn btn-sm btn-warning">
                <i class="fa fa-pencil"></i>
           </button>
           <button data-toggle="tooltip" data-placement="left" title="حذف" id="btnDeleteLocation" class="btn btn-sm btn-danger">
                <i class="fa fa-times"></i>
           </button>
      </div>
</div>

<div id="EditPanel" class="row edit hide treeview-panel">
     <div class="col-lg-7 pull-right">
          <input type="text" id="txtLocationEditTitle" class="form-control" />
     </div>
     <div class="col-lg-5 pull-left" style="text-align: left">
          <input type="button" value="ویرایش" id="btnEditPanelLocation" data-code="" data-parentId="" class="btn btn-sm btn-success" />
          <input type="button" value="انصراف" id="btnCancle" class="btn btn-sm btn-info" />
     </div>
</div>

 <div class="col-lg-6 k-rtl treeview-style">
                    @(Html.Kendo()
                          .TreeView()
                          .Name("treeview")
                          .DataTextField("Title")
                          .DragAndDrop(false)
                          .DataSource(dataSource => dataSource
                          .Model(model => model.Id("Id"))
                          .Read(read => read.Action(MVC.Admin.Location.ActionNames.GetAllAssetGroupTree, MVC.Admin.Location.Name)))
                    )
                </div>

.treeview-style {
    min-height: 86px;
    max-height: 300px;
    overflow: scroll;
    overflow-x: hidden;
    position: relative;
}
.treeview-panel {
    background-color: #eee;
    padding: 25px 0 25px 0;
}
.hide {
    display: none;
}

 var treeview = null;
    $(window).load(function () {
        treeview = $("#treeview").data("kendoTreeView");
    });

 $(document).on('click', '#btnAddLocation', function () {
        var title = $('#txtLocationTitle').val();
        var selectedNodeId = null;
        var selectedNode = treeview.select();
        if (selectedNode.length == 0) {
            selectedNode = null;
        }
        else {
            selectedNodeId = treeview.dataItem(selectedNode).id;// گرفتن آی دی گره انتخاب شده
        }
        $.ajax({
            url: '@Url.Action(MVC.Admin.Location.CreateByAjax())',
            type: 'POST',
            data: { Title: title, ParentId: selectedNodeId },
            success: function (data) {
                debugger;
                showMessage(data.message, data.notificationType);
                if (data.result)
                    treeview.dataSource.read();
            },
            error: function () {
                showMessage('لطفا مجددا تلاش نمایید', 'warning');
            }
        });

    });

var selectedNode = treeview.select();

 [HttpPost]
        public virtual ActionResult CreateByAjax(AddLocationViewModel locationViewModel)
        {
            if (ModelState.IsNotValid())
                return JsonResult(false, "عنوان نباید خالی و یا کمتر از دو کاراکتر باشد.", NotificationType.Error);
            var result = _locationService.Add(locationViewModel);//سرویس مورد نظر برای اضافه کردن به دیتابیس
            switch (result)
            {
                case AddStatus.AddSuccessful:
                    _uow.SaveChanges();
                    return JsonResult(true, Messages.SaveSuccessfull, NotificationType.Success);
                case AddStatus.Faild:
                    return JsonResult(false, Messages.SaveFailed, NotificationType.Error);
                case AddStatus.Exists:
                    return JsonResult(false, Messages.DataExists, NotificationType.Warning);
                default:
                    return JsonResult(false, Messages.SaveFailed, NotificationType.Error);
            }
        }

   public virtual JsonResult JsonResult(bool result, string message, string notificationType)
        {
            return Json(new { result = result, message = message, notificationType = notificationType }, JsonRequestBehavior.AllowGet);
        }

 public class AddLocationViewModel
    {
        [DisplayName("عنوان")]
        [Required(ErrorMessage ="لطفا عنوان گروه را وارد نمایید"),MinLength(2,ErrorMessage ="طول عنوان خیلی کوتاه می‌باشد ")]
        public string Title { get; set; }
        [DisplayName("گروه پدر")]
        public Guid? ParentId { get; set; }

    }

  public enum AddStatus
    {
        AddSuccessful,
        Faild,
        Exists
    }

  public class Messages
    {
        #region  Fields

        public const string SaveSuccessfull = "اطلاعات با موفقیت ذخیره شد";
        public const string SaveFailed = "خطا در ثبت اطلاعات";
        public const string DeleteMessage = "کابر گرامی ، آیا از حذف کردن این رکورد مطمئن هستید ؟";
        public const string DeleteSuccessfull = "اطلاعات با موفقیت حذف شد";
        public const string DeleteFailed = "خطا در حذف اطلاعات ، لطفا مجددا تلاش نمایید";
        public const string DeleteHasInclude = "کاربر گرامی ، رکورد مورد نظر هم اکنون در بانک اطلاعاتی سیستم در حال استفاده توسط منابع دیگر می‌باشد";
        public const string NotFoundData = "اطلاعات یافت نشد";
        public const string NoAttachmentSelect = "تصویری انتخاب نشده است";
        public const string DataExists = "اطلاعات وارد شده در بانک اطلاعاتی موجود می‌باشد";
        public const string DeletedRowHasIncluded = "کاربر گرامی ، رکوردی که قصد حذف آن را دارید هم اکنون در بانک اطلاعاتی سیستم ، توسط سایر بخش‌ها در حال استفاده می‌باشد";
        
        #endregion
    }

$(document).on('click', '#btnDeleteLocation', function () {
        var selectedNode = treeview.select();
        var currentNode = treeview.dataItem(selectedNode);
        if (selectedNode.length == 0) {
            showMessage('گزینه ای انتخاب نشده است. لطفا یک گزینه انتخاب نمایید', 'warning');
        } else {
            var selectedNodeId = treeview.dataItem(selectedNode).id;
            if (currentNode.hasChildren) {
                var title = 'کاربر گرامی ، با حذف شدن این گره، تمام زیر شاخه‌های آن حذف می‌شود. آیا مطمئن هستید ؟ ';
                DeleteConfirm(selectedNodeId, '@Url.Action(MVC.Admin.Location.DeleteByAjax())', title);
            } else {
                $.ajax({
                    url: '@Url.Action(MVC.Admin.Location.DeleteByAjax())',
                    type: 'POST',
                    data: { id: selectedNodeId },
                    success: function (data) {
                        debugger;
                        showMessage(data.message, data.notificationType);
                        if (data.result)
                            treeview.remove(selectedNode);
                    },
                    error: function () {
                        showMessage('لطفا مجددا تلاش نمایید', 'warning');
                    }
                });
            }
        }
    });

  public virtual ActionResult DeleteByAjax(Guid id)
        {
            var result = _locationService.Delete(id);
            switch (result)
            {
                case DeleteStatus.Successfull:
                    _uow.SaveChanges();
                    return DeleteJsonResult(true, Messages.DeleteSuccessfull, NotificationType.Success);
                case DeleteStatus.NotFound:
                    return DeleteJsonResult(false, Messages.NotFoundData, NotificationType.Error);
                case DeleteStatus.Failed:
                    return DeleteJsonResult(false, Messages.DeleteFailed, NotificationType.Error);
                case DeleteStatus.ThisRowHasIncluded:
                    return DeleteJsonResult(false, Messages.DeletedRowHasIncluded, NotificationType.Warning);
                default:
                    return DeleteJsonResult(false, Messages.DeleteFailed, NotificationType.Error);
            }
        }

  public DeleteStatus Delete(Guid id)
        {
            var model = GetAsModel(id);
            if (model == null) return DeleteStatus.NotFound;
            if (!CanDelete(model)) return DeleteStatus.ThisRowHasIncluded;
            _uow.MarkAsSoftDelete(model, _userManager.GetCurrentUserId());

            if (model.Children.Any())
                DeleteChildren(model);
            return DeleteStatus.Successfull;
        }

  private void DeleteChildren(Location model)
        {
            foreach (var item in model.Children)
            {
                _uow.MarkAsSoftDelete(item, _userManager.GetCurrentUserId());
                if (item.Children.Any())
                    DeleteChildren(item);
            }
        }

  public class Location:BaseEntity,ISoftDelete
    {
        public string Title { get; set; }
        public Location Parent { get; set; }
        public Guid? ParentId { get; set; }
        public bool IsDeleted { get; set; }

        public virtual ICollection<Location> Children { get; set; }
}

    // Open Edit Panel
    $(document).on('click', '#btnEditLocation', function () {
        debugger;
        var selectedNode = treeview.select();
        var currentNode = treeview.dataItem(selectedNode);// با استفاده از این خط، گره انتخاب شده جاری را می‌گیریم.


        if (selectedNode.length == 0) {
//این شرط به ما می‌گوید اگر گره ای انتخاب نشده بود پیغامی به کاربر نمایش بده
            showMessage('گزینه ای انتخاب نشده است. لطفا یک گزینه انتخاب نمایید', 'warning');
        } else {
            var selectedNodeCode = treeview.dataItem(selectedNode).Code;
            var selectedNodeTitle = treeview.dataItem(selectedNode).Title;
            var selectedNodeParentId = treeview.dataItem(selectedNode).ParentId;
// آی دی یا کد، عنوان و آی دی پدر گره انتخاب شده را با استفاده از این سه خط در اختیار می‌گیریم
            $('#CrudPanel').toggleClass('hide'); //المنت کرادپنل که در حال حاضر کاربر آن را می‌بیند، با این خط کد، پنهان می‌شود
            $('#EditPanel').toggleClass('hide'); //المنت ادیت پنل که در حال حاضر از دید کاربر پنهان است، قابل نمایش می‌شود

            $("#txtLocationEditTitle").val(selectedNodeTitle);
//عنوان گره ای که می‌خواهیم آن را ویرایش کنیم در تکست باکس مورد نظر قرار می‌گیرد
            $("#txtLocationEditTitle").focusTextToEnd();
// با استفاده از این پلاگین، کرسر ماوس در انتهای مقدار دیفالت تکست باکس قرار می‌گیرد
            $("#btnEditPanelLocation").attr('data-code', selectedNodeCode);
            $("#btnEditPanelLocation").attr('data-parentId', selectedNodeParentId == null ? '' : selectedNodeParentId);
//مقادیر پرنت آی دی و کد را در دیتا اتریبیوت‌های موجود در المنت خودمان قرار می‌دهیم
            // Disable clicking in treeview
            $("#treeview").children().bind('click', function () { return false; });
        }
    });

  (function ($) {
        $.fn.focusTextToEnd = function () {
            this.focus();
            var $thisVal = this.val();
            this.val('').val($thisVal);
            return this;
        }
    }(jQuery));

            $("#treeview").children().bind('click', function () { return false; });

  // Edit tree node
    $(document).on('click', '#btnEditPanelLocation', function () {
        debugger;
        var code = $("#btnEditPanelLocation").attr('data-code');
        var parentId = $("#btnEditPanelLocation").attr('data-parentId');
        var title = $("#txtLocationEditTitle").val().trim();
        $.ajax({
            url: '@Url.Action(MVC.Admin.Location.EditByAjax())',
            type: 'POST',
            data: { Code: code, Title: title, ParentId: parentId.length === 0 ? null : parentId },
            success: function (data) {
                debugger;
                showMessage(data.message, data.notificationType);
                if (data.result) {
                    treeview.dataSource.read();
                    CloseEditPanel();
                }
            },
            error: function () {
                showMessage('لطفا مجددا تلاش نمایید', 'warning');
            }
        });
    });

  [HttpPost]
        public virtual ActionResult EditByAjax(EditLocationViewModel editLocationViewModel)
        {

            if (ModelState.IsNotValid())
                return JsonResult(false,"عنوان نباید خالی و یا کمتر از دو کاراکتر باشد.", NotificationType.Error);
            var result = _locationService.Edit(editLocationViewModel);
            switch (result)
            {
                case EditStatus.Successful:
                    _uow.SaveChanges();
                    return JsonResult(true, Messages.SaveSuccessfull, NotificationType.Success);
                case EditStatus.NotFound:
                    return JsonResult(false, Messages.NotFoundData, NotificationType.Error);
                case EditStatus.Faild:
                    return JsonResult(false, Messages.SaveFailed, NotificationType.Error);
                case EditStatus.Exists:
                    return JsonResult(false, Messages.DataExists, NotificationType.Warning);
                default:
                    return JsonResult(false, Messages.SaveFailed, NotificationType.Error);
            }
        }

  function CloseEditPanel() {
        $('#CrudPanel').toggleClass('hide');
//پنل کراد ما که در حال حاضر از دید کاربر پنهان است با این خط ظاهر می‌گردد
        $('#EditPanel').toggleClass('hide');
//پنل ویرایش ما که در حال حاضر کاربر آن را می‌بیند، پنهان می‌شود از دید کاربر
        $("#txtLocationEditTitle").val('');
//مقدار تکست باکس خالی می‌شود
        $("#btnEditPanelLocation").attr('data-code', '');
        $("#btnEditPanelLocation").attr('data-parentId', '');
//دیتا اتریبیوت‌های ما که مقادیر کد و آی دی والد در آن قرار گرفته نیز خالی می‌شود
        // Enable clicking in treeview
        $("#treeview").children().unbind('click').bind('click', function () { return true; });
//اگر یادتان باشد با یک خط کد به کاربر اجازه ندادیم که با باز شدن پنل ویرایش، گره دیگری را انتخاب نمایی. حالا این خط کد عکس کد قبلیست و به کاربر اجازه می‌دهد در المنت مورد نظر کلیک کند
    }

   // Cancle edit Node tree
    $(document).on('click', '#btnCancle', function () {
        CloseEditPanel();
    });

  $(document).on('click', '#btnUnSelect', function () {
//رویداد عدم انتخاب
        treeview.select(null);
    });

this.Load += new System.EventHandler(this.Page_Load);

<% @Page AutoEventWireup="true" %>

Page_PreInit
Page_Init
Page_InitComplete
Page_PreLoad
Page_Load
Page_LoadComplete
Page_DataBind
Page_SaveStateComplete
Page_PreRender
Page_PreRenderComplete
Page_Unload
Page_Error
Page_AbortTransaction
Page_CommitTransaction

public class ServiceMapper<TChannel>
    {
        public static TChannel CreateChannel()
        {
            TChannel proxy;

            var endPointAddress = new EndpointAddress( "http://localhost:7000/" + typeof( TChannel ).Name.Remove( 0, 1 ) + ".svc" );

            var httpBinding = new BasicHttpBinding();
            
            ChannelFactory<TChannel> factory = new ChannelFactory<TChannel>( httpBinding, endPointAddress );

            proxy = factory.CreateChannel();

            return proxy;
        }
    }

"http://localhost:7000/" +  "BookService.svc"

  var channel = ServiceMapper<Contract.IBookService>.CreateChannel();
            channel.BeginGetAllBook( new AsyncCallback( ( asyncResult ) => 
            {
                channel.EndGetAllBook( asyncResult ).ToList().ForEach( _record => 
                {
                    Console.WriteLine( _record.Title );
                } );
            } ) , null );
            Console.WriteLine( "Loading..." );
            Console.ReadLine();