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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

Useful links

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• Nuget Entity Framework 6
• Nuget Entity Framework 5
• Nuget Entity Framework 4

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