How To Translate Oracle Decode

Hi,

How to translate oracle Decode without changed code I mean:

I have one application and instead to change all decode to case when I would like just replace decode for dbo.decode, so I

Wrote this function

select dbo.fnDecode( 1 , 2 , 3 )

first parameter always int, and the others parameters could be char, int or float.

I would like to test first value and return second or third value

-> sql_variant for all parameters, ok

but I can use + or -

I can't do this

select dbo.fnDecode( 1 , 2 , 3 ) + dbo.fnDecode( 1 , 2 , 3 )

If I put cast ok, but I is there another way, overload this call?

With clr doesn't work, because Sql Server doesn't accept function overload calls from C#



Any ideia????????????????????

cheers,