Question

I am working on a migration project, where I am migrating an web forms app to a ASP.NET MVC 4 app.

I have come across this one scenario with which I need a little help.

In the old web form project I have stored proc like…

ALTER PROCEDURE [dbo].[TestMultipleResultSet]
    @input VARCHAR
AS
BEGIN
    SET NOCOUNT ON;

    IF NOT EXISTS
    (
        SELECT * FROM Electronics
        WHERE name = @input
    )
    BEGIN
        SELECT 101 AS errorcode
        RETURN
    END

    SELECT * FROM Electronics 
    WHERE name = @input
END

like the above if not exist check, there are many other checks with gives different select * from as resultset.

Now I want to use Entity framework to execute this stored procedure, so I imported the function and created a complex type using the Get Column Information + Create Complex Type option which EF provides.

Now it runs when I enter a valid @input which executes SELECT * FROM Electronics WHERE name = @input but when I enter an input which is not present instead of returning me a 101 error code it gives me an error. An exception is thrown.

Exception details

The data reader is incompatible with the specified ‘testEFModel.GetTestResults_Result1’. A member of the type, ‘id’, does not have a corresponding column in the data reader with the same name.

How should I solve this ?

Answer 1

Is it really necessary that you use the stored procedure?

Using EF you could simply do:

var filteredItems = dc.Electronics.Where(e => e.Name == @input).ToList();

if (!filteredItems.Any())
    throw new ApplicationException("No items were found according to criteria");

Note: I have not actually run the above code; it just illustrates the idea doing things the EF way