Using Dapper to map more than 5 types

Question

I am currently building a SELECT query that joins 12 tables together. I\'ve been using Dapper for all my other queries and it works great. Problem is, the generic methods on

Answer 1

In a project I worked on I saw something like this to get more than 7 types mapped. We used Dapper 1.38:

connection.Query
(
   queryString,
   new[]
   {
      typeof(TypeOfArgument1),
      typeof(TypeOfArgument2),
      ...,
      typeof(TypeOfArgumentN)
   },
   objects =>
   {
      TypeOfArgument1 arg1 = objects[0] as TypeOfArgument1;
      TypeOfArgument2 arg2 = objects[1] as TypeOfArgument2;
      ...
      TypeOfArgumentN argN = objects[N] as TypeOfArgumentN;

     // do your processing here, e.g. arg1.SomeField = arg2, etc.
     // also initialize your result

     var result = new TypeOfYourResult(...)

     return result;
   },
   parameters,
   splitOn: "arg1_ID,arg2_ID, ... ,argN_ID"
);

The queryString is self-explanatory. The splitOn parameter says how Dapper should split the columns from the SELECT statement so that everything can be mapped properly to the objects, you can read about it here.