CODEWITHSUNDEEP
c#sql-serverwpfentity-frameworkstored-procedures
Alex
Alex

Reputation: 35831

Use stored procedure with parameters in Entity Framework

I'm using Entity Framework 6.1.3 and have used the database-first approach to let it generate the model files and the .EDMX. I also have the following stored procedure on SQL Server 2008 R2, which Entity Framework brought into the EDMX:

CREATE PROCEDURE [dbo].[FindEmployee] 
    @LastName nvarchar(50), 
    @employeeID nvarchar(50),
    @securityID nvarchar(50)
AS
BEGIN
    SET NOCOUNT ON;

    select * 
    from Employee
    where 
        (lastName = dbo.trim(@LastName) AND dbo.trim(@LastName) IS NOT NULL)
        OR  (employeeID = dbo.trim(@employeeID) AND dbo.trim(@employeeID) IS NOT NULL)
        OR  (securityID = dbo.trim(@securityID) AND dbo.trim(@securityID) IS NOT NULL)
    order by
        case when dbo.trim(@LastName) is not null then CONVERT(char(50), lastName) + CONVERT(char(50), firstName) 
                when dbo.trim(@employeeID) is not null then employeeID 
                when dbo.trim(@securityID) is not null then securityID
            end
END

In a Windows WPF app, I let the user select the column to search on (lastName, employeeID, or securityID) from a combobox. The user provides a search value which will get plugged into that parameter in the call to the stored procedure. The stored procedure then returns a resultset from its SELECT which I'll use to populate a DataGrid.

I'm trying to call the stored procedure in this code; Note that the FindEmployee_Result is an auto-generated class in the EDMX for the stored procedure:

public FindEmployee_Result SearchEmployees(string lastName, string employeeID, string securityID)
{
    var results = new FindEmployee_Result();

    using (var ctx = new TestSelectionEntities())
    {
        results = ctx.FindEmployee(lastName,employeeID,securityID);
    }

    return results;
}

This code blows up with this error:

Cannot implicitly convert type 'System.Data.Entity.Core.Objects.ObjectResult' to 'TestSelection.data.FindEmployee_Result'

What am I missing? Thank you.

Upvotes: 3

Views: 1885

Answers (1)

Alex
Alex

Reputation: 35831

The solution is to use a List, as the stored procedure returns a resultset of FindEmployee_Result objects:

public List<FindEmployee_Result> SearchEmployees(string lastName, string employeeID, string securityID)
{
    using (var ctx = new TestSelectionEntities())
    {
        return ctx.FindEmployee(lastName,employeeID,securityID).ToList();
    }
}

Upvotes: 5

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