reporting services - How can External Assemblies deal with SSRS variables? -

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i want create external assembly , reference inside ssrs reports, avoid repeating functions on every report create:

public function username() try return report.user!userid catch return "system" end try end function

however, "report.user!id" won't available inside external assembly.
i'm trying implement item 7 from: http://www.ssw.com.au/ssw/standards/rules/rulestobettersqlreportingservices.aspx#userexperience


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