Alternative way to get output parameter from stored procedure - dapper

Question

I love using Dapper for my ORM needs but I know there must be a better way to insert/update my sql server database using a stored procedure and strongly typed Lists.
For example:
I have a class Song:
public class Song
{
public int Id { get; set; }
public string title { get; set; }
public string genre { get; set; }
}
and somebody submits a List of songs:
List<Song> songs = new List<Song> {
new Song { Id = 1, title = "Song 1" , genre="rock"},
new Song { Id = 2, title = "Song 2" , genre="disco"}};
I want to update the database using my stored procedure which either inserts the new song or updates it if the song already exists. My stored procedure has two output parameters:
#success_added int = 0 and #success_updated int = 0
my sproc is as follows:
ALTER PROCEDURE [dbo].[UpdateSong]
#Id int = 0,
#title varchar(25) = NULL,
#genre varchar(25) = NULL,
#success_updated bit = 0 OUTPUT,
#success_added bit = 0 OUTPUT
AS
IF NOT EXISTS (SELECT Id FROM Songs WHERE Id = #Id)
BEGIN
INSERT INTO Songs
(
-- Id created by db
title,
genre
)
VALUES
(
#title,
#genre
)
SELECT #Success_Added = 1, #Success_Updated = 0
END
ELSE -- song already exists
BEGIN
UPDATE Songs
SET
title = #title,
#genre = #genre
WHERE Id = #Id
SELECT #Success_Added = 0, #Success_Updated = 1
END
RETURN
I know this works:
dbConn.Open();
DynamicParameters p = new DynamicParameters();
foreach (var song in songs)
{
p.Add("#Id", song.Id);
p.Add("#title", song.title);
p.Add("#genre", song.genre);
p.Add("#success_updated", dbType: DbType.Boolean, direction: ParameterDirection.Output);
p.Add("#success_added", dbType: DbType.Boolean, direction: ParameterDirection.Output);
dbConn.Execute("Test_UpdateSong", p, commandType: CommandType.StoredProcedure);
Console.WriteLine("#success_added: " + p.Get<Boolean>("#success_added"));
Console.WriteLine("#success_updated: " + p.Get<Boolean>("#success_updated"));
}
dbConn.Close();
But that requires manually converting each Song property to a anonymous type DynamicParameter. I'd rather simply do this:
dbConn.Open();
foreach (var song in songs)
{
var updateResult = dbConn.Query<dynamic>("Test_UpdateSong", song, commandType: CommandType.StoredProcedure);
}
dbConn.Close();
Which also works. But, now how do I get my output parameters?

Answer 1

As I stated originally, I didn't want to have to manually convert each class property to a Dapper dynamic parameter. This is critical because if I create a generic method, I may not know which class is being passed into the method and thus which properties to pass to convert to dynamic parameters. Taking #Metro Smurfs advice (when all else fails read the directions), I looked into the Dapper test class and found a solution that works for me:
DynamicParameters p = new DynamicParameters(song);
by adding the song object to the DynamicParameters constructor, a DynamicParameters template is created which will automatically convert all properties to parameters. Then I can simply add my two output parameters and execute the sproc:
p.Add("#success_updated", dbType: DbType.Boolean, direction: ParameterDirection.Output);
p.Add("#success_added", dbType: DbType.Boolean, direction: ParameterDirection.Output);
dbConn.Execute("Test_UpdateSong", p, commandType: CommandType.StoredProcedure);
// get my output parameters...
var success_added = p.Get<bool>("#success_Added");
var success_added = p.Get<bool>("#success_Updated");
and I'm good to go! Thanks to #Nick and #Metro Smurf for the suggestions!