DataTabe(DataRow)之间比较求交集、并集、差集

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

DataTable contactTable = ds.Tables["Contact"];

// Create two tables.
IEnumerable<DataRow> query1 = from contact in contactTable.AsEnumerable()
where contact.Field<string>("Title") == "Ms."
select contact;

IEnumerable<DataRow> query2 = from contact in contactTable.AsEnumerable()
where contact.Field<string>("FirstName") == "Sandra"
select contact;

DataTable contacts1 = query1.CopyToDataTable();
DataTable contacts2 = query2.CopyToDataTable();

// Find the intersection of the two tables-----求交集用 Intersect/Union(并集)/Except(差集)
var contacts = contacts1.AsEnumerable().Intersect(contacts2.AsEnumerable(),
DataRowComparer.Default);

Console.WriteLine("Intersection of contacts tables");
foreach (DataRow row in contacts)
{
Console.WriteLine("Id: {0} {1} {2} {3}",
row["ContactID"], row["Title"], row["FirstName"], row["LastName"]);
}