在执行带有多个out参数的过程时，出现错误“输入字符串格式不正确”

Question

            MyCmd = new MySqlCommand("SELECT FnGetTransDate()", MyCon);
            MyCon.Open();
            MyRead = MyCmd.ExecuteReader();
            MyRead.Read();
            transdate = Convert.ToDateTime(MyRead.GetValue(0).ToString());
            MyRead.Close();
            MyCmd = new MySqlCommand("SpGenProcess", MyCon);
            MyCmd.CommandType = CommandType.StoredProcedure;
            MyCmd.Parameters.AddWithValue("@tempprocessidlist", idlist);
            MyCmd.Parameters.AddWithValue("@prdate",Convert.ToDateTime(transdate.ToShortDateString()));
            MyCmd.Parameters.AddWithValue("@out_status", MySqlDbType.Int32);
            MyCmd.Parameters.AddWithValue("@out_msg", MySqlDbType.VarChar);
            MyCmd.Parameters["@out_status"].Direction = ParameterDirection.Output;
            MyCmd.Parameters["@out_msg"].Direction = ParameterDirection.Output;
            MyCmd.ExecuteNonQuery();
            int.TryParse(MyCmd.Parameters["@out_status"].Value.ToString(), out outstatus);
            ErMsg = MyCmd.Parameters["@out_msg"].Value.ToString();

在执行语句'MyCMd.ExecuteNonQuery（）'时出错Inupt字符串格式不正确？ [在线ExecuteNonQuery错误]

Answer 1

如果需要从阅读器读取值，请使用ExecuteReader

var reader = MyCmd.ExecuteReader();
if (reader.HasRows)
{
    if (reader.Read())
    {
        int status  = (int)reader["out_status"];//breakpoint here
        string msg = (string)reader["out_msg"]; //here also
    }
}