检查Eval（）是否为零，并显示锚标记的状态

Question

i have a repeater. and it fill certain numeric values within anchor tag. but if the value is zero i just want to display a span and anchor is discarded.

this is my code.

in HTML

    <td>
        <%if (ProcessMyDataItem(Eval("7DAYS").ToString()))
         {%>
<a class='aDetails' href="DashCheckInCheckOutDetails.aspx?building=<%=hiddenBuildingDetailsId.Value.ToString() %>&action=<%#Eval("ID") %>&day=7&name=<%#Eval("DESC") %>"><%#Eval("7DAYS") %> </a>
     <% }
      else
      {
          Response.Write("<span>0</span>");
      }
      %>
     </td>

and in the codebehind i have

public bool ProcessMyDataItem(string myValue)
        {
            if (myValue == "0")
            {
                return false;
            }

            return true;
        }

but when i run it, shows an error

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

is there any way to check eval value is zero and if zero, display span, else display anchor tag.

Answer 1

Try using:

 <%#Eval("7DAYS").ToString() != "0" ?"<a class='aDetails' href='DashCheckInCheckOutDetails.aspx?...'>3 </a>":" <span>0</span>"%>

This will work! i have tested!

NOTE: please add the url for the link as per your need.

Updated Answer:

  <%#Eval("7DAYS").ToString() != "0" ? "<a class='aDetails' href=DashCheckInCheckOutDetails.aspx?building="+hiddenBuildingDetailsId.Value+"&action="+Eval("ID") +"&day=7&name="+Eval("DESC") +">"+Eval("7DAYS")+" </a>" : " <span>0</span>" %>

This will work.

Answer 2

This is what I think

<%# Eval("7DAYS") == 0 ? "empty" : "notempty" %>

Also if the field value type is supposed to be string you could do something along the lines of..

<%# (Eval("7DAYS") as string) ?? "empty" %>

Answer 3

You must change your 'a tag' like this,

<a class="aDetails" href="DashCheckInCheckOutDetails.aspx?building="+<%hiddenBuildingDetailsId.Value.ToString() %>&action=<%Eval("ID") %>&day=7&name=<%Eval("DESC") %>'><% Eval("7DAYS") %> </a>

Let me know the result.