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Developers must be careful when using pound signs inside string expressions. Consider the following example as a guideline on when to use pound signs inside string expressions:
<CFSET A=2> <CFSET Expression1="1 + #A#"> <CFSET Expression2="1 + A"> <BR> <!--- This will produce a 3 ---> <CFOUTPUT>#Evaluate(Expression1)#</CFOUTPUT> <BR> <!--- This will produce a 3 also ---> <CFOUTPUT>#Evaluate(Expression2)#</CFOUTPUT> <BR> <!--- Now change the value of A ---> <CFSET A=5> <BR> <!--- This will produce a 3 again, because Expression1 is equal to the string "1 + 2". The value of A, which was 2 at the time Expression1 got its value was directly inserted into the expression text. ---> <CFOUTPUT>#Evaluate(Expression1)#</CFOUTPUT> <BR> <!--- This will produce a 6, because Expression2 is equal to "1 + A". The name, rather than the value of the variable A was inserted into the text of Expression2. ---> <CFOUTPUT>#Evaluate(Expression2)#</CFOUTPUT> <BR>
To build dynamic expressions with variables inside them, do not use pound signs around the variable names when you build the expression text.
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