如何添加if-else语句以更改GridView的BoundFields

Question

I am trying to do something like the code below:

<%= if(ddlChoice.SelectedItem.Value ==1) { %>
  <asp:BoundField DataField="FirstName" HeaderText="First Name">
      <HeaderStyle HorizontalAlign="Left" /></asp:BoundField>
  <asp:BoundField DataField="LastName"  HeaderText="Last Name">
      <HeaderStyle HorizontalAlign="Left" /></asp:BoundField>
<%= } else {  %>>
  <asp:BoundField DataField="Name" HeaderText="Name">
      <HeaderStyle HorizontalAlign="Left" /></asp:BoundField>
<%= } %>

I have a GridView , now I want to add if-else condition to change available BoundField s according to selected item in DropDownList ... Please Guide me !!!

Answer 1

In short: You cannot place your if statement between BoundField s as you are trying to do.

As an alternative solution, you could change the Visible property of each BoundField either from code behind or by setting a boolean value to that attribute in your .aspx file.

Another alternative solution is to have more than one GridView and change their visibility upon user selection.