This attribute is used to alter how a parameter is passed to the stored procedure. It is only useful when applied to Properties of a class that you pass into the WithInput extension method.

public class InputArgs
    public int StudentId { get; set; }
    [StoredProcedureParameter(Direction = ParameterDirection.ReturnValue)]
    public int Credits { get; set; }
    [StoredProcedureParameter(Direction = ParameterDirection.Output, SqlDbType = SqlDbType.Char)]
    public string Name { get; set; }

public IEnumerable<Classes> GetClasses(int studentId, out int credits, out string name)
    var input   = new InputArgs { StudentId = studentId };
    var results = StoredProcedure.Create("usp_getClassesByStudent")

    credits = input.Credits;
    name    = input.Name;

    return results;


When an Attribute derived from DataTransformerAttributeBase is applied to a property on the Model, it will be used to transform the data before being set on the property. There are built-in transformers for Automatically Converting Numeric Types, Interning Strings, and Trimming Strings. If you have any suggestions for more data transformations, please let me know!

Last edited May 4, 2014 at 8:41 PM by aheidebrecht, version 2