DataTable拷贝DataRow

一开始，思路是这样的：

DataTable dt = SqlHelper.GetTable("select * from Person");
DataTable dt2 = dt.Clone();
DataRow dr = dt.Rows[];
dt2.Rows.Add(dr);
Console.ReadKey();

遗憾的是，将会抛出一个异常：

修改后的实现方式：

DataTable dt = SqlHelper.GetTable("select * from Person");
DataTable dt2 = dt.Clone();
DataRow dr = dt.Rows[];
dt2.Rows.Add(dr.ItemArray);
Console.ReadKey();

或者 ：

DataTable dt = SqlHelper.GetTable("select * from Person");
DataTable dt2 = dt.Clone();
DataRow dr = dt.Rows[];
dt2.ImportRow(dr);
Console.ReadKey();

最后附上SqlHelper:

static class SqlHelper
{
    private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;

    public static DataTable GetTable(string sql, params SqlParameter[] paras)
    {
        using (SqlConnection conn = new SqlConnection(ConnectionString))
        {
            SqlCommand cmd = new SqlCommand(sql, conn);
            cmd.Parameters.AddRange(paras);
            SqlDataAdapter adapter = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            conn.Open();
            adapter.Fill(ds);
            return ds.Tables[];
        }
    }
}