c# - Dapper called in application, and called in DLL is throwing a MissingMethodException -


i'm wondering why application referencing dll created uses dapper failing. method not found: 'system.collections.generic.ienumerable'1<!!0> dapper.sqlmapper.query(system.data.idbconnection, system.string, system.object)'. error message. when track down offending code appears in dotpdfinvoidelayout.dll @ invoicemanager.loaddata() here below code method failing, because i'm calling dll, stack trace points last curly brace of method. line 1988. assuming real problem line makes call query()

public void loaddata(ienumerable<ipdfrenderable> textboxes) {     var conn = new sqlconnection("server=something;database=trims;uid=user;password=password;");     var output = conn.query<trimnameaddressmaster>("select top 1 * trims.dbo.trimnameaddressmaster id =  '" + _transaction.strap + "'", null).firstordefault();      var type = output.gettype();      var properties = type.getproperties();       var r = new system.text.regularexpressions.regex(@"((?<=\{)[^}]*(?=\}))+");        foreach (var textbox in textboxes)     {          var matches = r.matches(((pdftextbox)textbox).text);          foreach (match match in matches)         {             try             {                 var p = properties.single(pi => pi.name.tolower() == match.value.tolower());                 ((pdftextbox)textbox).text = ((pdftextbox)textbox).text.replace(                     "{" + match.value + "}", (p.getvalue(output, null) ?? string.empty).tostring());             }             catch (exception ex)             {                 console.writeline("no mapping occurred" + match.value);             }          }      } }

as console application dotpdfinvoicelayout runs fine. removed main() , changed project properties run class library copied generated dll bin of web application , referenced dll in web project.

i've tried make sure both using same version of dapper.

this sounds 1 of projects referencing down-level 3.5 library, , 1 referencing up-level 4.0/4.5 library. intentioanally have .net 3.5 project configured use c# 3.0 syntax - although in ways legacy thing "back in day" when dapper deployed code file rather assembly. consequence of using c# 3.0, doesn't have same level of support optional parameters, uses overloads instead. these overloads have never existed in 4.0/4.5 library. due this, 3.5 project not directly interchangeable 4.0 project.

change projects both targeting same .net level in terms of "dapper", , should work.


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