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IIF is always evaluating true

Posted on 2009-05-05
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Last Modified: 2013-11-07
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?
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Question by:cgcmq
4 Comments
 
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Expert Comment

by:Daniel Wilson
ID: 24310112
Not sure, but what about:
Visible='<%#  = IIF (1=2,false,true) %>'
or
Visible='<% = IIF (1=2,false,true) %>'
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LVL 28

Expert Comment

by:chilternPC
ID: 24310116

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
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Author Comment

by:cgcmq
ID: 24310155
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.
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Accepted Solution

by:
vkarumbaiah earned 500 total points
ID: 24314505
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)
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