FILLING A DATASET OR DATATABLE FROM A LINQ QUERY RESULT SET

Ankit Singh

Total Post:341

Points:2389
Posted by  Ankit Singh
C# 
C#
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How do you expose a LINQ query as an ASMX web service? Usually, from the business tier, I can return a typed DataSet or DataTable which can be serialized for transport over ASMX.

How can I do the same for a LINQ query? Is there a way to populate a typed DataSet or DataTable via a LINQ query?:

public static MyDataTable CallMySproc()   

{   

    string conn = ...;

    MyDatabaseDataContext db = new MyDatabaseDataContext(conn);    

    MyDataTable dt = new MyDataTable();

    // execute a sproc via LINQ

    var query = from dr in db.MySproc().AsEnumerable

    select dr;

    // copy LINQ query resultset into a DataTable -this does not work !   

    dt = query.CopyToDataTable();

    return dt;

}

How can I get the resultset of a LINQ query into a DataSet or DataTable? Alternatively, is the LINQ query serializeable so that I can expose it as an ASMX web service?
  1. Alex Leblois

    Post:67

    Points:471
    Re: Filling a DataSet or DataTable from a LINQ query result set

    Hi Ankit,

    As mentioned in the question, IEnumerable has a CopyToDataTable method:

    IEnumerable<DataRow> query =

        from order in orders.AsEnumerable()

        where order.Field<DateTime>("OrderDate") > new DateTime(2001, 8, 1)

        select order;

    // Create a table from the query.

    DataTable boundTable = query.CopyToDataTable<DataRow>();

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