Linq查询DataTable,DataRow

static void Main()
{
string strcon = global::TestLinqToSQL.Properties.Settings.Default.testConnectionString;
SqlConnection conn = new SqlConnection(strcon);
SqlDataAdapter da = new SqlDataAdapter("select * from T_Teacher", strcon);
DataTable dt = new DataTable();
da.Fill(dt);
conn.Close();

IEnumerable<DataRow> q1 = from r in dt.AsEnumerable()
where r.Field<int>("ID") % 2 == 0
select r;
foreach (var item in q1)
{
Console.WriteLine("ID={0},Name={1},Birthday={2}", item["ID"].ToString(), item["Name"].ToString(), item["Birthday"].ToString());
}
Console.WriteLine("-----------------------------------");
IEnumerable<DataRow> q2 = from r in dt.AsEnumerable()
where r.Field<int>("ID")>10
select r;
foreach (var item in q2)
{
Console.WriteLine("ID={0},Name={1},Birthday={2}", item["ID"].ToString(), item["Name"].ToString(), item["Birthday"].ToString());
}
Console.WriteLine("-----------------------------------");
DataTable dt1 = q1.CopyToDataTable();
DataTable dt2 = q2.CopyToDataTable();
//var except = dt2.AsEnumerable().Except(dt1.AsEnumerable() , DataRowComparer.Default); //集合排除
//var except = dt2.AsEnumerable().Union(dt1.AsEnumerable(), DataRowComparer.Default);   //集合并
var except = dt2.AsEnumerable().Intersect(dt1.AsEnumerable(), DataRowComparer.Default); //集合交
foreach (var item in except)
{
Console.WriteLine("ID={0},Name={1},Birthday={2}", item["ID"].ToString(), item["Name"].ToString(), item["Birthday"].ToString());
}
Console.WriteLine("done");
Console.ReadLine();
}