Hi,

I am trying to create breadcrumb. I found a solution from the following vb.net code:

http://www.codeguru.com/vb/vb_internet/aspnet/article.php/c6851#more

I am trying to convert the same to c#. I am getting various errors, like Cannot implicitly convert type 'object' to 'System.Collections.SortedList, and

Cannot implicitly convert type 'object' to 'BreadWeb.BreadCrumbUserControl.PageCrumb'. An explicit conversion exists (are you missing a cast?)

This is the code i am using in the usercontrol,which i created:

namespace BreadWeb
{
    public partial class BreadCrumbUserControl : System.Web.UI.UserControl
    {
        public struct PageCrumb
        {

            private short _level;
            private string _url;
            private string _linkName;


            public PageCrumb(short level, string url, string linkName)
            {

                _level = level;
                _url = url;
                _linkName = linkName;
            }


            public short Level
            {
                get { return _level; }
            }

            public string Url
            {
                get { return _url; }
            }

            public string LinkName
            {
                get { return _linkName; }
            }
        }

        private PageCrumb _pageCrumb;
        private SortedList _crumbList;
        private string _tailName;
        private short _level;

        public short Level
        {
            get
            {
                return _level;
            }
            set
            {
                _level = value;
            }
        }


        public string TailName
        {
            get
            {
                return _tailName;
            }
            set
            {
                _tailName = value;
            }
        }


        protected void Page_Load(object sender, EventArgs e)
        {

            if (!(Page.IsPostBack))
            {

                if ((_level <= 0))
                {
                    _level = 1;
                }

                if ((_tailName == ""))
                {
                    _tailName = "Untitled";
                }

                _pageCrumb = new PageCrumb(_level, Request.RawUrl, _tailName);


                if (Session["HASH_OF_CRUMPS"] == null)
                {
                    _crumbList = new SortedList();
                    Session.Add("HASH_OF_CRUMPS", _crumbList);
                }
                else
                {
                    _crumbList = Convert.ToString(Session["HASH_OF_CRUMPS"]);
                }


                ModifyList();

                PutBreadCrumbs();
            }

        }

        private void ModifyList()
        {
            RemoveLowerLevelCrumbs();
            if (_pageCrumb.Level == 1)
            {
                _crumbList.Clear();
                _crumbList.Add((short)1, new PageCrumb(1, "/Home.aspx", "Home"));
            }

            else
            {
                if (_crumbList.Count == 0)
                {
                    _crumbList.Add((short)1, new PageCrumb(1, "/Home.aspx", "Home"));
                }
                _crumbList.Add(_level, _pageCrumb);
            }
        }

        private void RemoveLowerLevelCrumbs()
        {
	      //  short level;
	        ArrayList removalList = new ArrayList(_crumbList.Count);
	        foreach (short level in _crumbList.Keys) {
		        if ((level >= _level)) 
                {
			        removalList.Add(level);
		        }
	        }
	        foreach (short level in removalList) 
            {
		        _crumbList.Remove(level);
	        }
        }

        private void PutBreadCrumbs()
        {
            System.Text.StringBuilder linkString = new System.Text.StringBuilder();

            PageCrumb pageCrumb = new PageCrumb();
            int index;

            for (index = 0; index <= _crumbList.Count - 2; index++)
            {
                pageCrumb = _crumbList.GetByIndex(index);
                linkString.Append(string.Format("<a href = {0} >{1} </a>", pageCrumb.Url, pageCrumb.LinkName));
                linkString.Append(" > ");
            }
            pageCrumb = _crumbList.GetByIndex(index);
            linkString.Append(pageCrumb.LinkName);

            lblTrail.Text = linkString.ToString();

        }


    }
}

Where is the conversion I am missing..  Please help.

Thank you

Hi,

Please see http://www.codeproject.com/KB/dotnet/CheatSheetCastingNET.aspx to understand implicit and explicit casting in .NET.

Now comes to your problem,

You are doing following casting mistakes ( There could be more but during high level walkthrough of you code , i foud following two only)

1. _crumbList = Convert.ToString(Session["HASH_OF_CRUMPS"]);

While you need to use,

_crumbList = (SortedList)Session["HASH_OF_CRUMPS"];

2. pageCrumb = _crumbList.GetByIndex(index);

while you need to use

pageCrumb = (PageCrumb) _crumbList.GetByIndex(index);

Thanks

Muhammad Akhtar Shiekh

Hi,

Thank you very much. That solved it.