using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Windows;
using System.Windows.Markup;
using Standard;

namespace Microsoft.Windows.Shell;

[ContentProperty("JumpItems")]
public sealed class JumpList : ISupportInitialize
{
    public static void AddToRecentCategory(string itemPath)
    {
        Verify.FileExists(itemPath, "itemPath");
        itemPath = Path.GetFullPath(itemPath);
        NativeMethods.SHAddToRecentDocs(itemPath);
    }

    [SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0")]
    public static void AddToRecentCategory(JumpPath jumpPath)
    {
        Verify.IsNotNull<JumpPath>(jumpPath, "jumpPath");
        JumpList.AddToRecentCategory(jumpPath.Path);
    }

    public static void AddToRecentCategory(JumpTask jumpTask)
    {
        Verify.IsNotNull<JumpTask>(jumpTask, "jumpTask");
        if (Utility.IsOSWindows7OrNewer)
        {
            IShellLinkW shellLinkW = JumpList.CreateLinkFromJumpTask(jumpTask, false);
            try
            {
                if (shellLinkW != null)
                {
                    NativeMethods.SHAddToRecentDocs(shellLinkW);
                }
            }
            finally
            {
                Utility.SafeRelease<IShellLinkW>(ref shellLinkW);
            }
        }
    }

    public static void SetJumpList(Application application, JumpList value)
    {
        Verify.IsNotNull<Application>(application, "application");
        lock (JumpList.s_lock)
        {
            JumpList jumpList;
            if (JumpList.s_applicationMap.TryGetValue(application, out jumpList) && jumpList != null)
            {
                jumpList._application = null;
            }
            JumpList.s_applicationMap[application] = value;
            if (value != null)
            {
                value._application = application;
            }
        }
        if (value != null)
        {
            value.ApplyFromApplication();
        }
    }

    public static JumpList GetJumpList(Application application)
    {
        Verify.IsNotNull<Application>(application, "application");
        JumpList result;
        JumpList.s_applicationMap.TryGetValue(application, out result);
        return result;
    }

    public JumpList() : this(null, false, false)
    {
        this._initializing = null;
    }

    public JumpList(IEnumerable<JumpItem> items, bool showFrequent, bool showRecent)
    {
        if (items != null)
        {
            this._jumpItems = new List<JumpItem>(items);
        }
        else
        {
            this._jumpItems = new List<JumpItem>();
        }
        this.ShowFrequentCategory = showFrequent;
        this.ShowRecentCategory = showRecent;
        this._initializing = new bool?(false);
    }

    public bool ShowFrequentCategory { get; set; }

    public bool ShowRecentCategory { get; set; }

    [SuppressMessage("Microsoft.Design", "CA1002:DoNotExposeGenericLists")]
    public List<JumpItem> JumpItems
    {
        get
        {
            return this._jumpItems;
        }
    }

    private bool _IsUnmodified
    {
        get
        {
            return this._initializing == null && this.JumpItems.Count == 0 && !this.ShowRecentCategory && !this.ShowFrequentCategory;
        }
    }

    [SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "BeginInit")]
    public void BeginInit()
    {
        if (!this._IsUnmodified)
        {
            throw new InvalidOperationException("Calls to BeginInit cannot be nested.");
        }
        this._initializing = new bool?(true);
    }

    [SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "EndInit")]
    [SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "BeginInit")]
    public void EndInit()
    {
        if (this._initializing != true)
        {
            throw new NotSupportedException("Can't call EndInit without first calling BeginInit.");
        }
        this._initializing = new bool?(false);
        this.ApplyFromApplication();
    }

    private static string _RuntimeId
    {
        get
        {
            string result;
            HRESULT hrLeft = NativeMethods.GetCurrentProcessExplicitAppUserModelID(out result);
            if (hrLeft == HRESULT.E_FAIL)
            {
                hrLeft = HRESULT.S_OK;
                result = null;
            }
            hrLeft.ThrowIfFailed();
            return result;
        }
    }

    [SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "JumpList")]
    [SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "EndInit")]
    public void Apply()
    {
        if (this._initializing == true)
        {
            throw new InvalidOperationException("The JumpList can't be applied until EndInit has been called.");
        }
        this._initializing = new bool?(false);
        this._ApplyList();
    }

    private void ApplyFromApplication()
    {
        if (this._initializing != true && !this._IsUnmodified)
        {
            this._initializing = new bool?(false);
        }
        if (this._application == Application.Current && this._initializing == false)
        {
            this._ApplyList();
        }
    }

    [SuppressMessage("Microsoft.Globalization", "CA1303:Do not pass literals as localized parameters", MessageId = "Standard.Verify.IsApartmentState(System.Threading.ApartmentState,System.String)")]
    [SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
    [SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "JumpLists")]
    private void _ApplyList()
    {
        Verify.IsApartmentState(ApartmentState.STA, "JumpLists can only be effected on STA threads.");
        if (!Utility.IsOSWindows7OrNewer)
        {
            this.RejectEverything();
            return;
        }
        List<JumpItem> jumpItems;
        List<JumpList._RejectedJumpItemPair> list;
        List<JumpList._ShellObjectPair> list2;
        try
        {
            this._BuildShellLists(out jumpItems, out list, out list2);
        }
        catch (Exception)
        {
            this.RejectEverything();
            return;
        }
        this._jumpItems = jumpItems;
        EventHandler<JumpItemsRejectedEventArgs> jumpItemsRejected = this.JumpItemsRejected;
        EventHandler<JumpItemsRemovedEventArgs> jumpItemsRemovedByUser = this.JumpItemsRemovedByUser;
        if (list.Count > 0 && jumpItemsRejected != null)
        {
            List<JumpItem> list3 = new List<JumpItem>(list.Count);
            List<JumpItemRejectionReason> list4 = new List<JumpItemRejectionReason>(list.Count);
            foreach (JumpList._RejectedJumpItemPair rejectedJumpItemPair in list)
            {
                list3.Add(rejectedJumpItemPair.JumpItem);
                list4.Add(rejectedJumpItemPair.Reason);
            }
            jumpItemsRejected(this, new JumpItemsRejectedEventArgs(list3, list4));
        }
        if (list2.Count > 0 && jumpItemsRemovedByUser != null)
        {
            List<JumpItem> list5 = new List<JumpItem>(list2.Count);
            foreach (JumpList._ShellObjectPair shellObjectPair in list2)
            {
                if (shellObjectPair.JumpItem != null)
                {
                    list5.Add(shellObjectPair.JumpItem);
                }
            }
            if (list5.Count > 0)
            {
                jumpItemsRemovedByUser(this, new JumpItemsRemovedEventArgs(list5));
            }
        }
    }

    private void _BuildShellLists(out List<JumpItem> successList, out List<JumpList._RejectedJumpItemPair> rejectedList, out List<JumpList._ShellObjectPair> removedList)
    {
        List<List<JumpList._ShellObjectPair>> list = null;
        removedList = null;
        ICustomDestinationList customDestinationList = CLSID.CoCreateInstance<ICustomDestinationList>("77f10cf0-3db5-4966-b520-b7c54fd35ed6");
        try
        {
            string runtimeId = JumpList._RuntimeId;
            if (!string.IsNullOrEmpty(runtimeId))
            {
                customDestinationList.SetAppID(runtimeId);
            }
            Guid guid = new Guid("92CA9DCD-5622-4bba-A805-5E9F541BD8C9");
            uint num;
            IObjectArray shellObjects = (IObjectArray) customDestinationList.BeginList(out num, ref guid);
            removedList = JumpList.GenerateJumpItems(shellObjects);
            successList = new List<JumpItem>(this.JumpItems.Count);
            rejectedList = new List<JumpList._RejectedJumpItemPair>(this.JumpItems.Count);
            list = new List<List<JumpList._ShellObjectPair>>
            {
                new List<JumpList._ShellObjectPair>()
            };
            foreach (JumpItem jumpItem in this.JumpItems)
            {
                if (jumpItem == null)
                {
                    rejectedList.Add(new JumpList._RejectedJumpItemPair
                    {
                        JumpItem = jumpItem,
                        Reason = JumpItemRejectionReason.InvalidItem
                    });
                }
                else
                {
                    object obj = null;
                    try
                    {
                        obj = JumpList.GetShellObjectForJumpItem(jumpItem);
                        if (obj == null)
                        {
                            rejectedList.Add(new JumpList._RejectedJumpItemPair
                            {
                                Reason = JumpItemRejectionReason.InvalidItem,
                                JumpItem = jumpItem
                            });
                        }
                        else if (JumpList.ListContainsShellObject(removedList, obj))
                        {
                            rejectedList.Add(new JumpList._RejectedJumpItemPair
                            {
                                Reason = JumpItemRejectionReason.RemovedByUser,
                                JumpItem = jumpItem
                            });
                        }
                        else
                        {
                            JumpList._ShellObjectPair item = new JumpList._ShellObjectPair
                            {
                                JumpItem = jumpItem,
                                ShellObject = obj
                            };
                            if (string.IsNullOrEmpty(jumpItem.CustomCategory))
                            {
                                list[0].Add(item);
                            }
                            else
                            {
                                bool flag = false;
                                foreach (List<JumpList._ShellObjectPair> list2 in list)
                                {
                                    if (list2.Count > 0 && list2[0].JumpItem.CustomCategory == jumpItem.CustomCategory)
                                    {
                                        list2.Add(item);
                                        flag = true;
                                        break;
                                    }
                                }
                                if (!flag)
                                {
                                    list.Add(new List<JumpList._ShellObjectPair>
                                    {
                                        item
                                    });
                                }
                            }
                            obj = null;
                        }
                    }
                    finally
                    {
                        Utility.SafeRelease<object>(ref obj);
                    }
                }
            }
            list.Reverse();
            if (this.ShowFrequentCategory)
            {
                customDestinationList.AppendKnownCategory(KDC.FREQUENT);
            }
            if (this.ShowRecentCategory)
            {
                customDestinationList.AppendKnownCategory(KDC.RECENT);
            }
            foreach (List<JumpList._ShellObjectPair> list3 in list)
            {
                if (list3.Count > 0)
                {
                    string customCategory = list3[0].JumpItem.CustomCategory;
                    JumpList.AddCategory(customDestinationList, customCategory, list3, successList, rejectedList);
                }
            }
            customDestinationList.CommitList();
            successList.Reverse();
        }
        finally
        {
            Utility.SafeRelease<ICustomDestinationList>(ref customDestinationList);
            if (list != null)
            {
                foreach (List<JumpList._ShellObjectPair> list4 in list)
                {
                    JumpList._ShellObjectPair.ReleaseShellObjects(list4);
                }
            }
            JumpList._ShellObjectPair.ReleaseShellObjects(removedList);
        }
    }

    private static bool ListContainsShellObject(List<JumpList._ShellObjectPair> removedList, object shellObject)
    {
        if (removedList.Count == 0)
        {
            return false;
        }
        IShellItem shellItem = shellObject as IShellItem;
        if (shellItem != null)
        {
            foreach (JumpList._ShellObjectPair shellObjectPair in removedList)
            {
                IShellItem shellItem2 = shellObjectPair.ShellObject as IShellItem;
                if (shellItem2 != null && shellItem.Compare(shellItem2, (SICHINT) 805306368u) == 0)
                {
                    return true;
                }
            }
            return false;
        }
        IShellLinkW shellLinkW = shellObject as IShellLinkW;
        if (shellLinkW != null)
        {
            foreach (JumpList._ShellObjectPair shellObjectPair2 in removedList)
            {
                IShellLinkW shellLinkW2 = shellObjectPair2.ShellObject as IShellLinkW;
                if (shellLinkW2 != null)
                {
                    string a = JumpList.ShellLinkToString(shellLinkW2);
                    string b = JumpList.ShellLinkToString(shellLinkW);
                    if (a == b)
                    {
                        return true;
                    }
                }
            }
            return false;
        }
        return false;
    }

    private static object GetShellObjectForJumpItem(JumpItem jumpItem)
    {
        JumpPath jumpPath = jumpItem as JumpPath;
        JumpTask jumpTask = jumpItem as JumpTask;
        if (jumpPath != null)
        {
            return JumpList.CreateItemFromJumpPath(jumpPath);
        }
        if (jumpTask != null)
        {
            return JumpList.CreateLinkFromJumpTask(jumpTask, true);
        }
        return null;
    }

    private static List<JumpList._ShellObjectPair> GenerateJumpItems(IObjectArray shellObjects)
    {
        List<JumpList._ShellObjectPair> list = new List<JumpList._ShellObjectPair>();
        Guid guid = new Guid("00000000-0000-0000-C000-000000000046");
        uint count = shellObjects.GetCount();
        for (uint num = 0u; num < count; num += 1u)
        {
            object at = shellObjects.GetAt(num, ref guid);
            JumpItem jumpItem = null;
            try
            {
                jumpItem = JumpList.GetJumpItemForShellObject(at);
            }
            catch (Exception ex)
            {
                if (ex is NullReferenceException || ex is SEHException)
                {
                    throw;
                }
            }
            list.Add(new JumpList._ShellObjectPair
            {
                ShellObject = at,
                JumpItem = jumpItem
            });
        }
        return list;
    }

    private static void AddCategory(ICustomDestinationList cdl, string category, List<JumpList._ShellObjectPair> jumpItems, List<JumpItem> successList, List<JumpList._RejectedJumpItemPair> rejectionList)
    {
        JumpList.AddCategory(cdl, category, jumpItems, successList, rejectionList, true);
    }

    private static void AddCategory(ICustomDestinationList cdl, string category, List<JumpList._ShellObjectPair> jumpItems, List<JumpItem> successList, List<JumpList._RejectedJumpItemPair> rejectionList, bool isHeterogenous)
    {
        IObjectCollection objectCollection = (IObjectCollection) Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("2d3468c1-36a7-43b6-ac24-d3f02fd9607a")));
        foreach (JumpList._ShellObjectPair shellObjectPair in jumpItems)
        {
            objectCollection.AddObject(shellObjectPair.ShellObject);
        }
        HRESULT hrLeft;
        if (string.IsNullOrEmpty(category))
        {
            hrLeft = cdl.AddUserTasks(objectCollection);
        }
        else
        {
            hrLeft = cdl.AppendCategory(category, objectCollection);
        }
        if (hrLeft.Succeeded)
        {
            int num = jumpItems.Count;
            while (--num >= 0)
            {
                successList.Add(jumpItems[num].JumpItem);
            }
            return;
        }
        if (isHeterogenous && hrLeft == HRESULT.DESTS_E_NO_MATCHING_ASSOC_HANDLER)
        {
            Utility.SafeRelease<IObjectCollection>(ref objectCollection);
            List<JumpList._ShellObjectPair> list = new List<JumpList._ShellObjectPair>();
            foreach (JumpList._ShellObjectPair shellObjectPair2 in jumpItems)
            {
                if (shellObjectPair2.JumpItem is JumpPath)
                {
                    rejectionList.Add(new JumpList._RejectedJumpItemPair
                    {
                        JumpItem = shellObjectPair2.JumpItem,
                        Reason = JumpItemRejectionReason.NoRegisteredHandler
                    });
                }
                else
                {
                    list.Add(shellObjectPair2);
                }
            }
            if (list.Count > 0)
            {
                JumpList.AddCategory(cdl, category, list, successList, rejectionList, false);
                return;
            }
        }
        else
        {
            foreach (JumpList._ShellObjectPair shellObjectPair3 in jumpItems)
            {
                rejectionList.Add(new JumpList._RejectedJumpItemPair
                {
                    JumpItem = shellObjectPair3.JumpItem,
                    Reason = JumpItemRejectionReason.InvalidItem
                });
            }
        }
    }

    [SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
    private static IShellLinkW CreateLinkFromJumpTask(JumpTask jumpTask, bool allowSeparators)
    {
        if (string.IsNullOrEmpty(jumpTask.Title) && (!allowSeparators || !string.IsNullOrEmpty(jumpTask.CustomCategory)))
        {
            return null;
        }
        IShellLinkW shellLinkW = (IShellLinkW) Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("00021401-0000-0000-C000-000000000046")));
        IShellLinkW result;
        try
        {
            string path = JumpList._FullName;
            if (!string.IsNullOrEmpty(jumpTask.ApplicationPath))
            {
                path = jumpTask.ApplicationPath;
            }
            shellLinkW.SetPath(path);
            if (!string.IsNullOrEmpty(jumpTask.WorkingDirectory))
            {
                shellLinkW.SetWorkingDirectory(jumpTask.WorkingDirectory);
            }
            if (!string.IsNullOrEmpty(jumpTask.Arguments))
            {
                shellLinkW.SetArguments(jumpTask.Arguments);
            }
            if (jumpTask.IconResourceIndex != -1)
            {
                string pszIconPath = JumpList._FullName;
                if (!string.IsNullOrEmpty(jumpTask.IconResourcePath))
                {
                    if ((long) jumpTask.IconResourcePath.Length >= 260L)
                    {
                        return null;
                    }
                    pszIconPath = jumpTask.IconResourcePath;
                }
                shellLinkW.SetIconLocation(pszIconPath, jumpTask.IconResourceIndex);
            }
            if (!string.IsNullOrEmpty(jumpTask.Description))
            {
                shellLinkW.SetDescription(jumpTask.Description);
            }
            IPropertyStore propertyStore = (IPropertyStore) shellLinkW;
            using (PROPVARIANT propvariant = new PROPVARIANT())
            {
                PKEY pkey = default(PKEY);
                if (!string.IsNullOrEmpty(jumpTask.Title))
                {
                    propvariant.SetValue(jumpTask.Title);
                    pkey = PKEY.Title;
                }
                else
                {
                    propvariant.SetValue(true);
                    pkey = PKEY.AppUserModel_IsDestListSeparator;
                }
                propertyStore.SetValue(ref pkey, propvariant);
            }
            propertyStore.Commit();
            IShellLinkW shellLinkW2 = shellLinkW;
            shellLinkW = null;
            result = shellLinkW2;
        }
        catch (Exception)
        {
            result = null;
        }
        finally
        {
            Utility.SafeRelease<IShellLinkW>(ref shellLinkW);
        }
        return result;
    }

    private static IShellItem2 GetShellItemForPath(string path)
    {
        if (string.IsNullOrEmpty(path))
        {
            return null;
        }
        Guid guid = new Guid("7e9fb0d3-919f-4307-ab2e-9b1860310c93");
        object obj;
        HRESULT hrLeft = NativeMethods.SHCreateItemFromParsingName(path, null, ref guid, out obj);
        if (hrLeft == (HRESULT) Win32Error.ERROR_FILE_NOT_FOUND || hrLeft == (HRESULT) Win32Error.ERROR_PATH_NOT_FOUND)
        {
            hrLeft = HRESULT.S_OK;
            obj = null;
        }
        hrLeft.ThrowIfFailed();
        return (IShellItem2) obj;
    }

    [SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
    private static IShellItem2 CreateItemFromJumpPath(JumpPath jumpPath)
    {
        try
        {
            return JumpList.GetShellItemForPath(Path.GetFullPath(jumpPath.Path));
        }
        catch (Exception)
        {
        }
        return null;
    }

    private static JumpItem GetJumpItemForShellObject(object shellObject)
    {
        IShellItem2 shellItem = shellObject as IShellItem2;
        IShellLinkW shellLinkW = shellObject as IShellLinkW;
        if (shellItem != null)
        {
            return new JumpPath
            {
                Path = shellItem.GetDisplayName((SIGDN) 2147647488u)
            };
        }
        if (shellLinkW != null)
        {
            StringBuilder stringBuilder = new StringBuilder(260);
            shellLinkW.GetPath(stringBuilder, stringBuilder.Capacity, null, SLGP.RAWPATH);
            StringBuilder stringBuilder2 = new StringBuilder(1024);
            shellLinkW.GetArguments(stringBuilder2, stringBuilder2.Capacity);
            StringBuilder stringBuilder3 = new StringBuilder(1024);
            shellLinkW.GetDescription(stringBuilder3, stringBuilder3.Capacity);
            StringBuilder stringBuilder4 = new StringBuilder(260);
            int iconResourceIndex;
            shellLinkW.GetIconLocation(stringBuilder4, stringBuilder4.Capacity, out iconResourceIndex);
            StringBuilder stringBuilder5 = new StringBuilder(260);
            shellLinkW.GetWorkingDirectory(stringBuilder5, stringBuilder5.Capacity);
            JumpTask jumpTask = new JumpTask
            {
                ApplicationPath = stringBuilder.ToString(),
                Arguments = stringBuilder2.ToString(),
                Description = stringBuilder3.ToString(),
                IconResourceIndex = iconResourceIndex,
                IconResourcePath = stringBuilder4.ToString(),
                WorkingDirectory = stringBuilder5.ToString()
            };
            using (PROPVARIANT propvariant = new PROPVARIANT())
            {
                IPropertyStore propertyStore = (IPropertyStore) shellLinkW;
                PKEY title = PKEY.Title;
                propertyStore.GetValue(ref title, propvariant);
                jumpTask.Title = (propvariant.GetValue() ?? "");
            }
            return jumpTask;
        }
        return null;
    }

    private static string ShellLinkToString(IShellLinkW shellLink)
    {
        StringBuilder stringBuilder = new StringBuilder(260);
        shellLink.GetPath(stringBuilder, stringBuilder.Capacity, null, SLGP.RAWPATH);
        string text = null;
        using (PROPVARIANT propvariant = new PROPVARIANT())
        {
            IPropertyStore propertyStore = (IPropertyStore) shellLink;
            PKEY title = PKEY.Title;
            propertyStore.GetValue(ref title, propvariant);
            text = (propvariant.GetValue() ?? "");
        }
        StringBuilder stringBuilder2 = new StringBuilder(1024);
        shellLink.GetArguments(stringBuilder2, stringBuilder2.Capacity);
        return stringBuilder.ToString().ToUpperInvariant() + text.ToUpperInvariant() + stringBuilder2.ToString();
    }

    private void RejectEverything()
    {
        EventHandler<JumpItemsRejectedEventArgs> jumpItemsRejected = this.JumpItemsRejected;
        if (jumpItemsRejected == null)
        {
            this._jumpItems.Clear();
            return;
        }
        if (this._jumpItems.Count > 0)
        {
            List<JumpItemRejectionReason> list = new List<JumpItemRejectionReason>(this.JumpItems.Count);
            for (int i = 0; i < this.JumpItems.Count; i++)
            {
                list.Add(JumpItemRejectionReason.InvalidItem);
            }
            JumpItemsRejectedEventArgs e = new JumpItemsRejectedEventArgs(this.JumpItems, list);
            this._jumpItems.Clear();
            jumpItemsRejected(this, e);
        }
    }

    public event EventHandler<JumpItemsRejectedEventArgs> JumpItemsRejected;

    public event EventHandler<JumpItemsRemovedEventArgs> JumpItemsRemovedByUser;

    private static readonly object s_lock = new object();

    private static readonly Dictionary<Application, JumpList> s_applicationMap = new Dictionary<Application, JumpList>();

    private Application _application;

    private bool? _initializing;

    private List<JumpItem> _jumpItems;

    private static readonly string _FullName = NativeMethods.GetModuleFileName(IntPtr.Zero);

    private class _RejectedJumpItemPair
    {
        public JumpItem JumpItem { get; set; }

        public JumpItemRejectionReason Reason { get; set; }
    }

    private class _ShellObjectPair
    {
        public JumpItem JumpItem { get; set; }

        public object ShellObject { get; set; }

        public static void ReleaseShellObjects(List<JumpList._ShellObjectPair> list)
        {
            if (list != null)
            {
                foreach (JumpList._ShellObjectPair shellObjectPair in list)
                {
                    object shellObject = shellObjectPair.ShellObject;
                    shellObjectPair.ShellObject = null;
                    Utility.SafeRelease<object>(ref shellObject);
                }
            }
        }
    }
}