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What's EntityFrameworkExtras?

EntityFrameworkExtras provides some useful additions to EntityFramework, such as executing Stored Procedures with User-Defined Table Types and Output Parameters.

Executing a Stored Procedure with a User Defined Table Type

• Define a stored procedure class

[StoredProcedure("storedproc_AddMemberWithAddresses")]
public class AddMemberStoredWithAddressesProcedure
{
        [StoredProcedureParameter(SqlDbType.NVarChar, ParameterName = "ForeName")]
    public string FirstName { get; set; }

    [StoredProcedureParameter(SqlDbType.NVarChar,ParameterName = "SurName")]
    public string LastName { get; set; }

    [StoredProcedureParameter(SqlDbType.Int)]
    public int Age { get; set; }

    [StoredProcedureParameter(SqlDbType.Udt)]
    public List<Address> Addresses { get; set; }
}

• A User Defined Table Type parameter is declared as a List<> (List
  ). The UDT will also require some attributes:

[UserDefinedTableType("udt_Address")]
public class Address
{
    [UserDefinedTableTypeColumn(1)]
    public string Line1 { get; set; }

    [UserDefinedTableTypeColumn(2)]
    public string Line2 { get; set; }

    [UserDefinedTableTypeColumn(3)]
    public string Postcode { get; set; }
}

• Execute the Stored Procedure with either a DbContext or an ObjectContext

DbContext context = new DbContext("ConnectionString");

var proc = new AddMemberStoredWithAddressesProcedure()
    {
        FirstName = "Michael",
        LastName = "Bovis",
        Age = 26,
        Addresses = new List<Address>()
        {
            new Address() {Line1 = "16", Line2 = "The Lane", Postcode = "MA24WE"}
        }
    };

context.Database.ExecuteStoredProcedure(proc);

Executing a Stored Procedure with an Output parameter

• To add an Output parameter, you need to set the Direction parameter to ParameterDirection.Output.

[StoredProcedure("storedProc_GetOldestAge")]
public class GetOldestAgeStoredProcedure
{
    [StoredProcedureParameter(SqlDbType.Int, Direction = ParameterDirection.Output)]
    public int Age { get; set; }
}

• Execute the Stored Procedure, and the parameter will be set to the output parameter value

var proc = new GetOldestAgeStoredProcedure();

context.Database.ExecuteStoredProcedure(proc);

int age = proc.Age; //Is now the oldest age

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