Question

I have a stored procedure and I whant to return an uniqueidentifier. So I declared an uniqueidentifier as OUTPUT. But then I “dragd and dropped” it do my LINQ to SQL DataClass and it would not recognize my returntype. It only recognized int or my linq classes.

How should I return the uniqueidentifier so I can use it with LINQ?

Answer 1

I found an explanation of how to return a uniqueidentifier. It contains some examples on returning the Guid.

Solution:

For .Net client using System.Data.SQLClient

The solution is to use the OUTPUT clause with the insert statement so
that the generated primary key can be extracted with the
ExecuteScalar() method of the SqlCommand object.

For. Net client using LINQ to SQL

Because the SQL Server generates the primary key in this scenario, the
LINQ to SQL will only work correctly if the Column attribute with
IsDbGenerated=true property is applied to entity property that
corresponds to the underlying primary key column.

There is also a question on SO regarding this issue:

LINQ to SQL entity column name attribute ignored with guid primary key