C# 两个datatable中的数据快速比较返回交集

using System.Data;
using System.Linq;

public class Demo
{
    public static DataTable Method(DataTable dt1, DataTable dt2)
    {
        var normalReceive = from r2 in dt2.AsEnumerable()
                            where (from r1 in dt1.AsEnumerable()
                                   select r1.Field<string>("taskmch")
                                   ).Contains(r2.Field<string>("taskmch"))
                            select r2;
        DataTable dt3 = normalReceive.CopyToDataTable();
        return dt3;
    }
}