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POSaving to session seems to erase value during Repeater's OnItemDataBound Event
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  1. POSaving to session seems to erase value during Repeater's OnItemDataBound Event
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    copied!<p>This is weird. I'll try to explain my pain by the following example:</p> <p>I've got an object in the Session: <strong>Session["reportQuestionGroupingTracker"]</strong>. It contains a List of strings. When a string is NOT found, a new h3 header is written in the repeater via a string literal.</p> <p>The problem seems to be the line: <strong>Session["reportQuestionGroupingTracker"] = ary;</strong> This line seems to somehow (black)magically remove the string value in <strong>lit.Text</strong>. The value is there when I breakpoint the code and seems to persist until it goes out of scope in the function(so that part works like expected) - but the string value never seems to make it to the Literal control on the ASP.NET page - they are always blank.</p> <p>Note that if I comment out the problem line or this line: <strong>if (!ary.Contains(headingText))</strong>, the headers show (but too many of them, since every iteration triggers a header write).</p> <pre><code>protected void rptQuestionsGroupedByCountry_OnItemDataBound(object sender, RepeaterItemEventArgs e) { RepeaterItem item = e.Item; ArrayList ary = new ArrayList(); if (null != Session["reportQuestionGroupingTracker"]) ary = (ArrayList)Session["reportQuestionGroupingTracker"]; if ((item.ItemType == ListItemType.Item) || (item.ItemType == ListItemType.AlternatingItem)) { DataRowView dr = (DataRowView)e.Item.DataItem; string headingText = dr["Heading"].ToString(); Literal lit = (Literal)e.Item.FindControl("LiteralHeader"); if (!ary.Contains(headingText)) { lit.Text = String.Format(@"&lt;h3 class=""questionGroupingHeader""&gt;{0}&lt;/h3&gt;", headingText); lit.Visible = true; ary.Add(headingText); Session["reportQuestionGroupingTracker"] = ary; } } } </code></pre> <p>I've been on this for hours, banging my head - I've done similar things hundreds of times before, I just can't work out why it doesn't work this time! I've tried changing the Repeater to a DataList, Tried using the Context.Items object instead of the Session, a List instead of an ArrayList, but I'm stymied. Help!</p> <p>I've also tried running it in IIS 6, just in case it was some Cassini weirdness, but the output is the same. It's an ASP.NET 4.0 Project.</p> <p>Here's the code from the aspx page:</p> <pre><code> &lt;asp:Repeater ID="rptQuestionsGroupedByCountry" runat="server" OnItemDataBound="rptQuestionsGroupedByCountry_OnItemDataBound"&gt; &lt;HeaderTemplate&gt;&lt;table&gt;&lt;/HeaderTemplate&gt; &lt;ItemTemplate&gt; &lt;tr&gt;&lt;td&gt; &lt;asp:Literal ID="LiteralHeader" runat="server" Visible="false" /&gt; &lt;h3 class="report-country-tag"&gt;&lt;%#DataBinder.Eval(Container, "DataItem.Numbers")%&gt;.&lt;%#DataBinder.Eval(Container, "DataItem.QusetionName")%&gt;&lt;/h3&gt; &lt;div class="report-content"&gt; &lt;%#DataBinder.Eval(Container, "DataItem.Answer")%&gt; &lt;p class="date"&gt;Date Updated: &lt;%#DataBinder.Eval(Container, "DataItem.DocumentModifiedWhen")%&gt;&lt;/p&gt; &lt;/div&gt; &lt;/td&gt;&lt;/tr&gt; &lt;/ItemTemplate&gt; &lt;FooterTemplate&gt;&lt;/table&gt;&lt;/FooterTemplate&gt; </code></pre> <p></p>
 

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