Can I map a result to Tuple in Dapper?

Question

I am trying to select a list of 2 integer columns map the results to a Tuple. Just as an example:

return connection.Query>(\"sele         


        

Answer 1

Tuple is one option, I prefer using a dynamic result whenever I do not want to create a class, i.e.,

string sql = "Select 'f' as Foo, 'b' as Bar";

var result = connection.Query(sql).Single();

string foo = result.Foo;
string bar = result.Bar

The name of the field returned from the result will be the name of the dynamic property.

In your case, you are wanting to return a list and not assign to single variables, so a Tuple would be more appropriate:

string sql = "select id1, id2 from sometable";

List> result = conn.Query>( // *1
    sql,
    Tuple.Create, // *2
    splitOn: "*" ) // *3
    .AsList(); // *4

*1 = > tells dapper that there will be two integers that will return a Tuple

*2 = tells dapper to use a Tuple to return the result

*3 = tells dapper that every field returned is used to return a result for each property of the Tuple.

*4 = Dapper extension method to cast Dapper's internal result to a List; by default, Dapper returns a list under the covers so the cast will be faster than copying to a new list.