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.NET Forum / ASP.NET / General / December 2007

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Can I use the value of a bound data item within repeater, without binding it?

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mark4asp - 03 Dec 2007 17:35 GMT
I have a table bound to a repeater. There is a DateTime column called
EntryDate. When the EntryDate changes day [when CompareDates() is true]
I want to write the date out.  I want to compare the value of an item
from a table column with a public variable and then set the variable to
the value of that item when the days change [CompareDates() will do
this provided it ]

Can I access the value of EntryDate column? If so how? Clearly not by
using Eval because that requires me to bind it so something which I
don't want to do.

It compiles and gives a runtime error:

    Databinding methods such as Eval(), XPath(), and Bind() can only be
used in the context of a databound control.

If it's possible to fix the code below, how so?

<% if (CompareDates(DateStored, Eval("EntryDate")))
    {
        DateStored = (DateTime)Eval("EntryDate");
%>
            </table>
            <div class='TabBar'>
                <span id='tabDate1' class='TabLeft'><%#
Convert.ToDateTime(DataBinder.Eval(Container.DataItem,
"EntryDate")).ToString("ddd MMM dd yyyy") %></span>
                <span class='TabRightBlank'></span>
            </div>
            <table cellspacing="2" class="DayGroup">
<%} %>

// code behind
public bool CompareDates(DateTime dateStored, object entryDate)
{
    DateTime et;
    if (entryDate is DBNull)
        return false;
    else
    {
        et = (DateTime)entryDate;
        return (new DateTime(DateStored.Year, DateStored.Month,
DateStored.Day) > new DateTime(et.Year, et.Month, et.Day));
    }
}
mark4asp - 03 Dec 2007 18:51 GMT
> I have a table bound to a repeater. There is a DateTime column called
> EntryDate. When the EntryDate changes day [when CompareDates() is
[quoted text clipped - 41 lines]
>     }
> }

Thanks to anyone who looked at this. I already solved the problem.

The solution, using an asp:Repeater is to carry out the logic in code
behind [the PrintDate() method here] and to return a string from that
logic. i.e.:

        <ItemTemplate>

            <%#PrintDate(DataBinder.Eval(Container.DataItem, "EntryDate"))%>

            <!-- blah, blah, blah -->

        </ItemTemplate>

    // code behind
    public string PrintDate(object entryDate)
    {
        StringBuilder sb;
        DateTime et;
        if (entryDate is DBNull)
            return "";
        else
        {
            et = (DateTime)entryDate;
            if (new DateTime(DateStored.Year, DateStored.Month, DateStored.Day)
> new DateTime(et.Year, et.Month, et.Day))
            {
                DateStored = et;
                sb = new StringBuilder(@"                    </table><br />
                        <div class='TabBar'>
                            <span id='tabDate", 256);
                sb.Append(TabCount.ToString());
                TabCount++;
                sb.Append("' class='TabLeft'>");
                sb.Append(et.ToString("ddd dd MM yyyy"));
                sb.Append(@"</span>
                            <span class='TabRightBlank'></span>
                        </div>
                        <table cellspacing='2' class='DayGroup'>");
                return sb.ToString();
            }
            else
                return "";
        }
    }

--

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