How can i fill Anonymous type in list?

I try to write some codes about Generate list from Anonymous type via below codes :
public static List<T> MakeList<T>(T itemOftype)
{
    List<T> newList = new List<T>();
    newList.Add(itemOftype);
    return newList;
}

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But ERROR return me:

    A primary key field specified via the KeyFieldName property is not found in the underlying data source. Make sure the field name is spelled correctly. Pay attention to the character case.

Main.cs

var Qry = from tableRaletions in taskMaints.TaskRelations
    where tableRaletions.TaskId == Convert.ToInt32(txtID.Text) && tableRaletions.RelTypeId == 12
    select new
    {
        tableRaletions.RefMaintenance.code,
        tableRaletions.RefMaintenance.shortdesc
    };
GridMaintenanceData.DataSource = SetCalculatedTaskField.MakeList(Qry);
GridMaintenanceData.DataBind();

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Please don't say why directly return Tolist(). i know it but i need above....
programmeristAsked:
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tovvenkiCommented:
Hi,
Which line is throwing this error?
see if this helps you
http://community.devexpress.com/forums/p/81912/280307.aspx

Thanks and regards,
Venki
0
kris_perCommented:

var Qry - already has a method named 'ToList()' and you can use that like:

GridMaintenanceData.DataSource = Qry.ToList();

Grid's datasource will work with the list returned by Qry.ToList();

0
kris_perCommented:

Just saw the last line in your question...then...

it seems the issue is not with MakeList, but in the linq query....from the error message it looks like - taskMaints.TaskRelations doesn't have the key field name....

0
daryalCommented:
hello,
maybe i am wrong but,
don't you need to make the call SetCalculatedTaskField.MakeList(Qry) with using a type;
like SetCalculatedTaskField.MakeList<ClassA>(itemTypeOfClassA);

0
kris_perCommented:

I think the issue is: var Qry - is IEnumerable list type; you are passing that to MakeList and adding it to another list...so the returned list is actually a list of another list.

Try the below code:



GridMaintenanceData.DataSource = SetCalculatedTaskField.MakeList(Qry.ToList());


public static List<T> MakeList<T>(List<T> list) // change param to List<T>
        {
            List<T> newList = new List<T>();
            newList.AddRange(list);
            return newList;
        }

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0

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