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[];
}
}
}