关于在.net通过XML传送数据

如鱼得水RYDS

于 2017-05-10 00:35:59 发布

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分类专栏： C# 文章标签： .net xml 数据

本文链接：https://blog.youkuaiyun.com/qq_35699528/article/details/71513364

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本文介绍了从数据库中抽取数据并进行处理的方法，包括将数据转换为数组再插入List，以及将数据放入DataSet并转化为XML返回的过程。同时，还详细展示了如何使用C#实现对象的序列化。

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1.将从数据库中抽取出来的数据转换成数组，再将数组插入list中
1）从数据库中抽取数据
` MySqlParameter param1 = new MySqlParameter(“?_work_no”, MySqlDbType.String, 20);
param1.Value = work_no + “”;
MySqlParameter[] parameters = { param1 };
reader2 = ExcuteReader(“GetRouteFromView”, CommandType.StoredProcedure, parameters)
2）将数组插入List中

  List<System.String> listS = new List<System.String>();
   while (reader2.Read())
   {
                    Console.WriteLine(reader2[0].ToString() + "###" + reader2.GetValue(1).ToString());
                    String[] arr = new String[] { reader2[0].ToString(), reader2.GetValue(1).ToString(), reader2.GetValue(2).ToString(), reader2.GetValue(3).ToString() };
                    listS.AddRange(arr);
   }

3)将List对象序列化

string temp = HomeController.Serializer(listS.GetType(), listS);

序列化方法：

  public static string Serializer(Type type, object obj)
         {
             MemoryStream Stream = new MemoryStream();
             XmlSerializer xml = new XmlSerializer(type);
             try
             {
                 //序列化对象
                 xml.Serialize(Stream, obj);
             }
             catch (InvalidOperationException)
             {

                 throw;
             }
             Stream.Position = 0;
             StreamReader sr = new StreamReader(Stream);
             string str = sr.ReadToEnd();

             sr.Dispose();
             Stream.Dispose();

             return str;
         }

2.直接将数据库抽取的表格放到DataSet,然后再通过将DataSet转化成XML，返回字符串

  public string GetPositionXML(string work_no)
        {
            //MySqlDataReader reader2 = null;
            string strXML = "";
            try
            {
                //访问数据库，查询数据 
                MySqlParameter param1 = new MySqlParameter("?_work_no", MySqlDbType.String, 20);
                param1.Value = work_no + "";
                MySqlParameter[] parameters = { param1 };
                strXML = ExcuteReaderXmL("GetRouteFromView", CommandType.StoredProcedure, parameters);         
                   return strXML;
            }
            catch (Exception e)
            {
                return "查询出现异常" + e.ToString();
            }
            finally
            {
               // reader2.Close();
            }
        }


        //将DataSet转化成XML，返回字符串
        static public string ExcuteReaderXmL(string sql, CommandType type, params MySqlParameter[] parameters)
        {
            MySqlConnection conn = new MySqlConnection();
            //链接数据库相关地址
            string str = "";
            try
            {
                conn.Open();
                Console.WriteLine("成功连接到数据库！");
                MySqlDataAdapter adapter = new MySqlDataAdapter();
               // MySqlCommand command = new MySqlCommand(sql, conn);
                adapter.SelectCommand = new MySqlCommand(sql, conn);
                adapter.SelectCommand.CommandType = type;
                DataSet ds = new DataSet();
                DataTable dt = new DataTable("userData");
                if (parameters != null)
                {
                    adapter.SelectCommand.Parameters.AddRange(parameters);
                    adapter.Fill(ds);
                    ds.DataSetName = "Positions";
                    str = ConvertDataSetToXML(ds);

                }
                return str;
            }
            catch (System.Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                // conn.Close();
            }
        }
        //将dataset转化成字符串
        public static string ConvertDataSetToXML(DataSet xmlDS)
        {
            MemoryStream stream = null;
            XmlTextWriter writer = null;

            try
            {
                stream = new MemoryStream();
                //从stream装载到XmlTextReader  
                writer = new XmlTextWriter(stream, Encoding.Unicode);

                //用WriteXml方法写入文件.  
                xmlDS.WriteXml(writer);
                int count = (int)stream.Length;
                byte[] arr = new byte[count];
                stream.Seek(0, SeekOrigin.Begin);
                stream.Read(arr, 0, count);

                UnicodeEncoding utf = new UnicodeEncoding();
                return utf.GetString(arr).Trim();
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (writer != null) writer.Close();
            }
        }