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HistoryPoint doesn't work after hyperlink clicked and come back with ListView sorted

Posted on 2008-09-29
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Last Modified: 2013-11-08
Hi, I have a ListView putted inside UpdatePanel which can be sorted and paged. HistoryPoint works only in the page itself, but once I clicked the link in the row of the ListView to go to a different page and come back, the last history point is not the point I left. I inserted the code AddHistoryPoint to LinkButton_dClicke event method so that once the link was clicked, the history point is created with the page number and sorted column name and sort method(ascending or desending). But when I come back to the ListView from the detail page, it doesn't show  the list that I left. Here are the codes;


private void AddHisotryPointAmount(string sortExpression, SortDirection sortDirection)
    {
        if (ScriptManager1.IsInAsyncPostBack && !ScriptManager1.IsNavigating)
        {
            string v = string.Empty;
            if (sortDirection == SortDirection.Ascending)
                v = "ASC:" + sortExpression;
            else
                v = "DES:" + sortExpression;
 
            v += "PAGENUM:" + DataPager1.StartRowIndex;
            ScriptManager1.AddHistoryPoint("A", v);
        }
    }
 
 
    protected void ScriptManager1_Navigate(object sender, HistoryEventArgs e)
    {
        int cState = e.State.Keys.Count;
        if (cState < 1)
        {
            //the list is in initial state. never sorted or paged. 
        }
        else
        {
           // string lastStateKey = e.State.Keys[cState-1];
            //string lastStateValue = e.State[lastStateKey];
            string lastStateKey = e.State.Keys[0];
            string lastStateValue = e.State[0];
 
            if (lastStateKey == "P")
            {
                int pageNum = Int32.Parse(lastStateValue);
                DataPager1.SetPageProperties(pageNum, DataPager1.PageSize, true);
            }
            else if (lastStateKey == "S")
            {
                string sortExpression = string.Empty;
                if (lastStateValue.IndexOf("ASC:") > -1)
                {
                    sortExpression = lastStateValue.Substring(lastStateValue.IndexOf("ASC:") + 4);
                    ListView1.Sort(sortExpression, SortDirection.Ascending);
                }
                else if (lastStateValue.IndexOf("DES:") > -1)
                {
                    sortExpression = lastStateValue.Substring(lastStateValue.IndexOf("DES:") + 4);
                    ListView1.Sort(sortExpression, SortDirection.Descending);
                }
            }
            else if (lastStateKey == "A")
            {
                string sortExpression = string.Empty;
                if (lastStateValue.IndexOf("ASC:") > -1)
                {
                    sortExpression = lastStateValue.Substring(lastStateValue.IndexOf("ASC:") + 4, lastStateValue.IndexOf("PAGENUM:")-(lastStateValue.IndexOf("ASC:") + 4));
                    ListView1.Sort(sortExpression, SortDirection.Ascending);
                }
                else if (lastStateValue.IndexOf("DES:") > -1)
                {
                    sortExpression = lastStateValue.Substring(lastStateValue.IndexOf("DES:") + 4, lastStateValue.IndexOf("PAGENUM:") - (lastStateValue.IndexOf("DES:") + 4));
                    ListView1.Sort(sortExpression, SortDirection.Descending);
                }
                int pageNum = Int32.Parse(lastStateValue.Substring(lastStateValue.IndexOf("PAGENUM:")+8));
                DataPager1.SetPageProperties(pageNum, DataPager1.PageSize, true);
            }
            else { }
            
        }
        
    }
 
 
 
protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e)
    {
        try
        {
            LinkButton lnkTotalCondidate = (LinkButton)e.CommandSource;
            LinkButton lnkTotal = (LinkButton)e.Item.FindControl("lnkTotal");
 
            if (lnkTotalCondidate.ID == lnkTotal.ID)
            {
                AddHisotryPointAmount(ListView1.SortExpression,ListView1.SortDirection);
                Response.Redirect("SingleReceipt.aspx?ResNo=" + lnkTotal.Attributes["ResNo"]);
            }
        }
        catch (Exception ex)
        {
            ;
        }
        
    }

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Question by:crcsupport
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crcsupport earned 0 total points
ID: 22602946
I solved the problem. I had to insert historypoint for both paging and sorting everytime no matter what action(paging, sorting, leaving the page to another page).  I like AJAX how they work with no flash, but sometimes it's very headache to find bug when coding.
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