[Last Call] Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 728
  • Last Modified:

IIF is always evaluating true

I am trying to set the visibility of an asp.net tag to false, based on a condition, using IIF.  The statement is always evaluating to true.

Visible='<%# IIF (1=2,false,true) %>'

The above code, when placed in a tag, is still visible even though the condition is clearly false. The complete tag is:

<asp:HyperLink ID="HyperLink1" runat="server" Text="[more]" NavigateUrl="~/exhibits/chilling_out/en/more.aspx" Visible='<%# IIF (1=2,false,true) %>' />

What am I doing wrong?
0
cgcmq
Asked:
cgcmq
1 Solution
 
Daniel WilsonCommented:
Not sure, but what about:
Visible='<%#  = IIF (1=2,false,true) %>'
or
Visible='<% = IIF (1=2,false,true) %>'
0
 
chilternPCCommented:

the expression use are using "1=2"  is not a boolean expression

this may explain more.....

http://msdn.microsoft.com/en-us/library/27ydhh0d(VS.71).aspx

and

http://www.secretgeek.net/iif_function.asp
0
 
cgcmqAuthor Commented:
Visible='<%#  = IIF (1=2,false,true) %>' will not compile due to the leading = sign.

I am not sure why 1 = 2 would not be considered a boolean expression.  

The links you refer to discuss the problems of using an IIF when there is a chance that either the true or false part of the statement cannot be executed such as is the case when dividing by 0.  In my case, both true and false are valid values of the visibility attribute.
0
 
vkarumbaiahCommented:
I'm not sure if server tags can evaluate expressions so I doubt you could do this in a server tag.
You could put this in a code behind as follows

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        HyperLink1.Visible = IIf((1 = 2), True, False)
    End Sub

also note your logic in the iif is incorrect
it should be
 IIf((1 = 2), True, False)
0

Featured Post

NEW Veeam Backup for Microsoft Office 365 1.5

With Office 365, it’s your data and your responsibility to protect it. NEW Veeam Backup for Microsoft Office 365 eliminates the risk of losing access to your Office 365 data.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now