asked on

C# - Conditional Statements within Repeater Control?

My code is below. It currently loops through the record, displays a header and a table containing data. No problem, that works. However, I'm wondering how I can change the code so that a row isn't displayed if the cell is empty. For example, if the 'event_location' field is empty, I don't want it to display the entire table row (<tr>). How can I do that? Embedding IF statements didn't work for me (or at least, I didn't have the correct syntax). Please advise.

=================================

<%@ Page Language="C#" Debug="true" %>

<script language="C#" runat="server">
void Page_Load(Object semder, EventArgs e) {

      if (!Page.IsPostBack)
      {

       // CREATE SQL CONNECTION
       SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["connString"]);
       DataSet ds = new DataSet();

       // LOAD AND DISPLAY ANNOUNCEMENTS
       string sSQL = "SELECT * FROM mytable";

       SqlDataAdapter da = new SqlDataAdapter(sSQL, conn);

       da.Fill(ds, "IS_IN_MESSAGE_TBL");

       announcements.DataSource = ds.Tables[0].DefaultView;
       announcements.DataBind();

      }
}

</script>

<html><body>

<ASP:Repeater id="announcements" runat="server">
      <ItemTemplate>
            <h3><%# DataBinder.Eval(Container.DataItem, "event_name") %></h3>

            <table>
              <tr>
              <td>Location: </td>
              <td><%# DataBinder.Eval(Container.DataItem, "event_location") %></td>
              </tr>
              <tr>
              <td>Description: </td>
              <td><%# DataBinder.Eval(Container.DataItem, "description") %></td>
              </tr>
              <tr>
              <td>Contact: </td>
              <td><%# DataBinder.Eval(Container.DataItem, "contact") %></td>
              </tr>
            </table>

      </ItemTemplate>
</ASP:Repeater>

</body></html>

dfu23

you wouldn't want to just simply databind the repeater to the dataset then ...

you need to iterate through the dataset and check for the condition that you want and then add it to your repeater ...

or you should change your SQL to not return the rows that meet your condition ...

SELECT * FROM mytable WHERE event_location IS NOT NULL

hendridm

ASKER

Iterating through the dataset with conditional statements would work, however, I thought the point of ASP.NET was separating code from content, so I was trying to do it the "ASP.NET way" with the repeater control and not embedding code in the content. I will do that if there is no better way.

Regarding the modified SELECT statement, I don't want to eliminate records that have a null event_location - I still want to display the other data. Classic ASP example:

<% Do Until rs.EOF %>

<h3><%=rs("event_name")%></h3>

<table>
<% If rs("event_location") <> "" Then %>
<tr>
<td>Location: </td>
<td><%=rs("event_location")%></td>
</tr>
<% End If %>
<tr>
<td>Description: </td>
<td><%=rs("description")%></td>
</tr>
<tr>
<td>Contact: </td>
<td><%=rs("contact")%></td>
</tr>
</table>

<% rs.MoveNext:Loop %>

As you can see, it doesn't display the location row if the record is empty, however, it still displays the other rows. I can do a similar method with C#, however, I was hoping to do it the "ASP.NET way".

I'm trying to learn ASP.NET, and it's a pain in the ass! I want to do things the right way, not the ASP way - otherwise I lose all the advantages over ASP.

dfu23

Instead of using a repeater use a datalist ... within the datalist ... in the items template create a table control <asp:table> and then create a row crontrol within the table <asp:tablerow> ... and within the table row (or table rows) create a table cell <asp:tablecell>

the table cell will contain the data and give each one an ID, along with the table rows and the table itself

then use the event onitemdatabound call a function to check if that item's data is null ... in your case the event_location

if it's null find the control within the datalist that contains the event location and set its visibility to false.

SOLUTION

Justin_W

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mmarinov

Hi hendridim,

you can do it in this way

if (!IsPostBack)
{
SqlConnection _con = new SqlConnection();
SqlCommand _com = new SqlCommand();
DataSet _ds = new DataSet();
SqlDataAdapter _da = new SqlDataAdapter();

_con.ConnectionString = "ConfigurationSettings.AppSettings["connString"]";
_com.Connection = _con;
_com.CommandText = "SELECT * FROM mytable";
_com.CommandType = CommandType.Text;

_da.SelectCommand = _com;
_da.Fill( _ds, IS_IN_MESSAGE_TBL );

Repeater1.DataSource = _ds.Tables[0].Select("event_location IS NOT NULL");
Repeater1.DataBind();

}

But in your repeater you have to do some changes like

<ASP:Repeater id="announcements" runat="server">
<ItemTemplate>
<h3><%# DataBinder.Eval(Container.DataItem, "[event_name]") %></h3>

<table>
<tr>
<td>Location: </td>
<td><%# DataBinder.Eval(Container.DataItem, "[event_location]") %></td>
</tr>
<tr>
<td>Description: </td>
<td><%# DataBinder.Eval(Container.DataItem, "[description]") %></td>
</tr>
<tr>
<td>Contact: </td>
<td><%# DataBinder.Eval(Container.DataItem, "[contact]") %></td>
</tr>
</table>

</ItemTemplate>
</ASP:Repeater>

B..M

ASKER CERTIFIED SOLUTION

dfu23

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