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

Saw this example on MSDN which you may find useful. Its using the LINQ syntax.

DataSet ds = new DataSet();
ds.Locale = CultureInfo.InvariantCulture;
FillDataSet(ds);

DataTable orders = ds.Tables["SalesOrderHeader"];
DataTable details = ds.Tables["SalesOrderDetail"];

var query =
    from order in orders.AsEnumerable()
    join detail in details.AsEnumerable()
    on order.Field("SalesOrderID") equals
        detail.Field("SalesOrderID")
    where order.Field("OnlineOrderFlag") == true
    && order.Field("OrderDate").Month == 8
    select new
    {
        SalesOrderID =
            order.Field("SalesOrderID"),
        SalesOrderDetailID =
            detail.Field("SalesOrderDetailID"),
        OrderDate =
            order.Field("OrderDate"),
        ProductID =
            detail.Field("ProductID")
    };


foreach (var order in query)
{
    Console.WriteLine("{0}\t{1}\t{2:d}\t{3}",
        order.SalesOrderID,
        order.SalesOrderDetailID,
        order.OrderDate,
        order.ProductID);
}