Dynamic Columns Selection

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Dear Code project,

I am using c# , Linq to Entities with SQL server. I have a problem while writing a query using this.

Following is my present code.

C#

private List<DataAccount> GetDataAccountDetails()
{
PIAEntities piaentity = new PIAEntities(strConn);

List<DataAccount>dataAccou nt = (from p in piaentity.DataAccounts
               where p.FollowUpRequired == true && p.PreviousOwener == UserName        &&p.FollowUpOn < DateTime.Now
                              select p).ToList<DataAccount>();

}

After execution of this query it is returing entire database columns to DataGrid View. But my Client is expecting like he should have an option to select number of columns only. This means user will filter some columns some where from the datagrid view. I need to pass it to the above query and get those columns only.

With the above request it should like

C#

private List<DataAccount> GetDataAccountDetails(string[] columns)
{
PIAEntities piaentity = new PIAEntities(strConn);

List<DataAccount>dataAccou nt = (from p in piaentity.DataAccounts
               where p.FollowUpRequired == true && p.PreviousOwener == UserName        &&p.FollowUpOn < DateTime.Now
                              select p).ToList<DataAccount>();

}

the paramenter can be either string[] or only string. No Issues. Based on the passed paraments only i need to filter and get the results.

Hope explined clearly. Thanks in advance.

chowdary.

Posted 14-Sep-12 0:35am

Charles Shob

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_Amy · Answer 1 · 2012-09-14T00:40:00

Try this:

C#

private List<dataaccount> GetDataAccountDetails(string[] columns)
{
    PIAEntities piaentity = new PIAEntities(strConn);
     
    var nt = from p in piaentity.DataAccounts
                                     where p.FollowUpRequired == true 
                                     && p.PreviousOwener == UserName   
                                     && p.FollowUpOn < DateTime.Now
                                     select new{
                                            Column1 = p.Column1,
                                            Column2 = p.Column2,
                                            Column3 = p.Column3,
                                            Column4 = p.Column4,
                                     };
    var customList = MakeList(nt);

}
public static List<T> MakeList<T>(T itemOftype)
{
    List<T> newList = new List<T>();
    return newList;
}

--Amit

Sangramsingh Pawar · Answer 2 · 2012-09-14T00:45:00

Solution 2

See below link

http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx[^]

Posted 14-Sep-12 0:45am

Sangramsingh Pawar