Question

Hopefully this is relatively simple. After I perform a LINQ query on a DataTable I want to put the results in a another DataTable which I plan to create dynamically. What I need is to find the name of th column titles in the LINQ Query reults collection.

EDIT: The LINQ Query

var results= from a in dt.AsEnumerable()
                    where a.Field<int>("ID") == i 
                    select new 
                    {
                       ID = a.Field<int>("ID"),
                       a = a.Field<double>("A"),
                       b = a.Field<double>("B")
                    };

I am basically trying to return – “ID”, “a”, and “b”.

Really hope that makes sense!

Answer 1

Since query results set is a set of anonymous type items you can NOT do anything in terms of DataTable and DataColumn/Rows… But you can retrieve names using reflection since each column will be represented as public property of the anonymous type:

IEnumerable<string> names = results.First()
                                   .GetType()
                                   .GetProperties()
                                   .Select(p => p.Name);

This would return:

[0]: "ID"
[1]: "a"
[2]: "b"