Is it a bug - SSIS 2012 ReadOnlyVariables in Script Task doesn't work

Question

It's very weird when I use the ReadOnlyVariables in SSIS 2012 Script Task, it doesn't work at all!!! And I never notice this change before, but everything in 2008 R2 is fine! Is it a bug in SSIS 2012 ?
All the variables I set them to "ReadOnlyVariables"
In scripts - I assigned some values from system variables.
String PackageName = Dts.Variables["System::PackageName"].Value.ToString();
DateTime CurrentDate = (DateTime)Dts.Variables["System::StartTime"].Value;
// User Defined Variables
Dts.Variables["User::PV_CURRENT_DATE"].Value = CurrentDate;
Dts.Variables["User::PV_YEAR"].Value = CurrentDate.Year;
Dts.Variables["User::PV_MONTH"].Value = CurrentDate.Month;
Dts.Variables["User::PV_DAY"].Value = CurrentDate.Day;
Dts.Variables["User::PV_PACKAGE_NAME"].Value = PackageName;
Execute the package, it works !
The only thing I can make it as SSIS 2008 R2 does is to change the ReadOnly for each variables.
Then you will get the error.
Why do we need this feature here but not to use the ReadOnlyVariables in script task ?
Please vote if it's helpful and mark it as an answer!

Answer 1

I can reproduce it as well. Feels like a bug...
Locking the variable for read in code has the same effect:
public void Main()
// Lock variable for read
Dts.VariableDispenser.LockForRead("User::myStringVariable");
// Create a variables 'container' to store variables
Variables vars = null;
// Add variable from the VariableDispenser to the variables 'container'
Dts.VariableDispenser.GetVariables(ref vars);
// Now try giving it a new name
vars["User::myStringVariable"].Value = "new value";
// Release the locks
vars.Unlock();
Dts.TaskResult = (int)ScriptResults.Success;
For reference:
https://connect.microsoft.com/SQLServer/Feedback/Details/991697
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