How to create an anonymous object with property names determined dynamically?

Question

Given an array of values, I would like to create an anonymous object with properties based on these values. The property names would be simply \"pN\" where N

Answer 1

You are misusing Dapper, you should never need to do this, instead either implement IDynamicParameters or use the specific extremely flexible DynamicParameters class.

In particular:

string sql = "select * from Account where Id = @id and username = @name";
var values = new DynamicParameters();
values.Add("id", 1);
values.Add("name", "bob");
var accounts = SqlMapper.Query(connection, sql, values);

DynamicParameters can take in an anonymous class in the constructor. You can concat DynamicParameters using the AddDynamicParams method.

Further more, there is no strict dependency on anon-types. Dapper will allow for concrete types as params eg:

class Stuff
{
   public int Thing { get; set; }
}

...

cnn.Execute("select @Thing", new Stuff{Thing = 1});

Kevin had a similar question: Looking for a fast and easy way to coalesce all properties on a POCO - DynamicParameters works perfectly here as well without any need for magic hoop jumping.