If comparision operator is one of these or contains ?

  • Thread starter Thread starter jobs
  • Start date Start date
J

jobs

In the case where I need to check to see if a variable is one of many
values

IIF (( (Container.DataItem("ProcessStateId") = 0) or
(Container.DataItem("ProcessStateId") = 2) or
(Container.DataItem("ProcessStateId") = 4) ) ,"TRUE","FALSE")

Is there a smarter way to do this? and where would I have found that on
MSDN or Language refrences pages?

Thanks.
 
Why not use a select case like the following?

dim ReturnString as string

select case Container.DataItem("ProcessStateId")
case 0, 2, 4
ReturnString = "True"
case else
ReturnString = "False"
end select

I like using a Select Case statement over IIF because (imo) they are
much easier to read, modify, and maintain.

Just my 2 cents,

Seth Rowe
 
I thought about that.. and that might work.. I need to squeze the code
inside the Enable propertty of a button under a datagrid of asp.net
page.

<asp:Button ID="Rate" Text="Rate"
CommandArgument='<%#Eval("ProcessId") %>' CommandName="Rate"
Enabled='<%# IIF (( (Container.DataItem("ProcessStateId") = 0) or
(Container.DataItem("ProcessStateId") = 2) or
(Container.DataItem("ProcessStateId") = 4) ) ,"TRUE","FALSE") %>'
runat="server" />
 
Im setting the button's enabled property at Early binding conditioning
based on data in the specific row. Keep in mind if I will do this in
late binding I will have to loop select again and then set that
property for each row.

Write a function that returns a boolean called from inside the enabled
property and pass it the bound item I need to condition from? Is that
really possible? If so, please send me the code.

Thanks.
 
jobs said:
In the case where I need to check to see if a variable is one of many
values

IIF (( (Container.DataItem("ProcessStateId") = 0) or
(Container.DataItem("ProcessStateId") = 2) or
(Container.DataItem("ProcessStateId") = 4) ) ,"TRUE","FALSE")

Is there a smarter way to do this? and where would I have found that on
MSDN or Language refrences pages?

Thanks.
Click to expand...

I'd suggest you use short-sircuit operators ("OrElse", "AndAlso"),
instead of bitwise operators ("Or", "And"). This is because
short-ciruit operators are specific for boolean values. As a
consequence, if the first test yelds true, the other two won't be
evaluated. In other words, instead of evaluating all three expressions,
the runtime would evaluate each expression until it finds a true one,
and short-circuit the others because it "knows" that the result will be
true.

If you replace the operators, maybe you don't need the iif. I guess
that a boolean value, ToString, will already return "True" or "False".

HTH.

Regards,

Branco.
 
jobs said:
I thought about that.. and that might work.. I need to squeze the code
inside the Enable propertty of a button under a datagrid of asp.net
page.

<asp:Button ID="Rate" Text="Rate"
CommandArgument='<%#Eval("ProcessId") %>' CommandName="Rate"
Enabled='<%# IIF (( (Container.DataItem("ProcessStateId") = 0) or
(Container.DataItem("ProcessStateId") = 2) or
(Container.DataItem("ProcessStateId") = 4) ) ,"TRUE","FALSE") %>'
runat="server" />
Click to expand...

Then you need a fuction like this:

Function IsOneOf( _
ByVal iFind as Integer _
, ByVal ParamArray iValues As Integer() _
) as Boolean

For Each iVal As Integer In iValues
If iFind = iVal Then
Return True
End If
Next

Return False
End Function

then

<asp:Button
ID="Rate"
Text="Rate"
CommandArgument='<%#Eval("ProcessId") %>'
CommandName="Rate"
Enabled='<%# IIf(IsOneOf(CInt(Container.DataItem("ProcessStateId")),
0, 2, 4), "TRUE", "FALSE") %>'
runat="server"
/>

HTH,
Phill W.
 
Nice. Thanks.
Then you need a fuction like this:

Function IsOneOf( _
ByVal iFind as Integer _
, ByVal ParamArray iValues As Integer() _
) as Boolean

For Each iVal As Integer In iValues
If iFind = iVal Then
Return True
End If
Next

Return False
End Function

then

<asp:Button
ID="Rate"
Text="Rate"
CommandArgument='<%#Eval("ProcessId") %>'
CommandName="Rate"
Enabled='<%# IIf(IsOneOf(CInt(Container.DataItem("ProcessStateId")),
0, 2, 4), "TRUE", "FALSE") %>'
runat="server"
/>

HTH,
Phill W.
Click to expand...
 
Jason,
Write a function that returns a boolean called from inside the enabled
property and pass it the bound item I need to condition from? Is that
really possible? If so, please send me the code.
Click to expand...
Yes its possible, as IIf *is* a function!

Where Whatever is defined in your code behind:

Protected Function Whatever(processStateId As String) As String
Select Case processStateId
Case 0, 2, 4
Return "True"
Case Else
Return "False"
End Select
End Function

NOTE: I would consider Defining Whatever as a boolean instead of a string:

Protected Function Whatever(processStateId As String) As Boolean

Of course you will want to define a more appropriate name for the Whatever
function.
 
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