Finding the intersection of two .NET DataTables

Question

Is there a relatively straightforward way to get the intersection of two DataTables in .NET?

I can think of the obvious ways (iterating over both tables myself in O(

Answer 1

With .NET 3.5:

using System.Data;

public static class DataTableExtensions
{
    public static IEnumerable Intersect(this DataTable table, DataTable other)
    {
        return table.AsEnumerable().Intersect(other.AsEnumerable());
    }

    public static IEnumerable Intersect(this DataTable table, DataTable other, IEqualityComparer comparer)
    {
        return table.AsEnumerable().Intersect(other.AsEnumerable(), comparer);
    }
}