I have a stored procedure in DBML and I try to pass the result to “sqlQryArray” as an array(1 dimensional array). But the bottom code causes error like below message. What else should be done?
Error 1 Value of type ‘1-dimensional array of aaaDatabase.stp_GetSomethingResult’ cannot be converted to ‘1-dimensional array of String’ because ‘aaaDatabase.stp_GetSomethingResult’ is not derived from ‘String’.
The return result from stored procedure is a just list of first names of students(only one column)
Dim sqlQry = aaaLINQ.stp_GetSomething(bbb,ccc,ddd)
Dim sqlQryArray As String() = sqlQry.ToArray()
Some background
Once the stored procedure result has been returned, it is converted into a ISingleResult, which implements IEnumerable, and returned to the calling client. As ISingleResult is a generic class, an object with the same name as the sproc is created with the same properties as returned by the stored procedure.
When using stored procedures they can only return items of type ISingleResult or IMultipleResult. This causes a number of problems when using the created objects. Firstly, in your client code you will have to manually convert the result to something like ToList() if you want to bind the objects to a data source. If you convert the objects to a list then they will not be change-tracked. Finally, you cannot benefit from deferred loading when using stored procedures as the call to the database is executed when the method is called.
Read the complete article here: http://blog.benhall.me.uk/2008/05/linq-to-sql-stored-procedure-vs.html
Check this too: a possible solution where you immediately re-map the result to your own POCO representation. You can also use a LINQ query to manipulate your result:
LINQ to SQL: Stored Procedure Results