locked
REturned Columns and Order by clause problem

    Question

  •  

    Hi Guys, I am starting to work with LINQ and found some problems that the reason can be my small knolegment about the tecnology, but, its strange.

     

    Well, when I make the following query :

     

    Code Snippet

    dim x = From r in datacontext.table where r.name = "Test" select [date] = r.date.toShortDateString, r.Name

     

     

     

    Until now, everything ok, but, when I add the Order by [date]. get the following messge.

     

    Both DataSource and DataSourceID are defined on 'gvEvents'.  Remove one definition.

     

    Another question is that, how can I set a alias for my columns with space ? Example:

     

    Code Snippet

    SQL - select name as 'My account'  , 'My address' = address from Table

     

    LINQ - .....   select [My account] = name didnt work.

     

     

     

    Tks a lot.

     

    Thiago

    Consultoria e Desenvolvimento de Soluções em Ti

    Wednesday, February 13, 2008 10:16 PM

All replies

  • I'm by no means a LINQ expert (I just started using it yesterday) but have you tried adding the following:

    dim x = From r in datacontext.table where r.name = "Test" select [date] = r.date.toShortDateString, r.Name Into TestGroup = Group Order By [date]

    The other thing you could try is giving your select fields aliases before doing the order by.  It would look like this I think:

    dim x = From r in datacontext.table where r.name = "Test" select MyDate = r.date.toShortDateString, MyName = r.Name


    I'm just learning this too so let me know if this works for you.
    Saturday, February 23, 2008 3:44 PM
  • I don't think the name [date] is in scope in your order by and the VB compiler is generating some erroneous error message.  Of course, I'm guessing since you have not shown where the order-by clause is placed in your query.  The select clause you are using is constructing an anonymous type with two fields, one named '[date]' and the other named 'Name'.  You need something in scope that refers to the anonymous type instance before you can access the [date] field.  I'd suggest adding an into clause after the select but before the order-by.

     

    dim x = From r in datacontext.table

                Where r.name = "Test"

                Select [date] = r.date.toShortDateString, r.Name Into x

                Order By x.[date]

     

     

     

     

     

    Sunday, February 24, 2008 12:29 AM
  •  

    The error looks like your gridview has been assigned a datasource in the aspx and in code. This is not a linq error / not linq related, but instead you need to remove either the designer datasource or the code that assigns a datasource...
    Sunday, February 24, 2008 3:03 PM