Dapper Extensions is a small library that complements Dapper by adding basic CRUD operations (Get, Insert, Update, Delete) for your POCOs. For more advanced querying scenarios, Dapper Extensions provides a predicate system. The goal of this library is to keep your POCOs pure by not requiring any attributes or base class inheritance.
Per your notes, I tried to add:
DapperExtensions.DapperExtensions.DefaultMapper = typeof(MyCustomClassMapper<>);
For an existing SQL DB with pluralized table names. It says DefaultMapper does not exist. Any ideas?