SqlQueryToList 执行SQL语句并把结果返回成一个List<dynamic>

/// <summary>
/// EF SQL 语句返回 List<dynamic>
/// </summary>
/// <param name="db"></param>
/// <param name="sql"></param>
/// <param name="paras"></param>
/// <returns></returns>
public static List<dynamic> SqlQueryToList(this System.Data.Entity.DbContext db, string sql,  params IDataParameter[] paras)
{

//SqlConnection conn = new System.Data.SqlClient.SqlConnection();
//conn.ConnectionString = db.Connection.ConnectionString;
//if (conn.State != ConnectionState.Open)
//{
//    conn.Open();
//}

SqlConnection conn = GetSqlConnect(db.Database.Connection);

//conn = (SqlConnection)db.Connection;
SqlCommand cmd = new SqlCommand();
if (paras != null)
{
cmd.Parameters.AddRange(paras);
}
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = sql;

SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable table = new DataTable();
adapter.Fill(table);

List<dynamic> os = new List<dynamic> ();
foreach (DataRow row in table.Rows)
{
dynamic dobj  = new System.Dynamic.ExpandoObject();
var dic = (IDictionary<string, dynamic>)dobj; //定义另外一个别名变量. 然后进行动态赋值..
foreach (DataColumn col in table.Columns)
{
dic[col.ColumnName] = row[col];// 上面不定义别名这里就不能用dic[]
}
os.Add(dobj);
}
//conn.Close();//连接需要关闭
//conn.Dispose();
return os;
}