WebService如何传递HashTable

摘自： http://www.cnblogs.com/JieDavid/articles/2101814.html

在工作中，通常需要调用WebService,这样的话在参数传递方面，就诸多不便！比如自定义实体类、HashTable就不能直接传递，所以我们在客户端要把此类型数据经过序列化成XML后方可传递。今天，就简单给大家介绍一下，在Asp.net中如何简单、快速传递HashTable。

　　首先，在WebService中定义调用方法及反序列化Xml类型，代码如下：

　　   /// <summary>
        /// 反序列化数据
        /// </summary>
        /// <param name="sXml"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        private T DeSerializer<T>(String sXml,Type type)
        {
            XmlReader reader = XmlReader.Create(new StringReader(sXml));
            System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(type);
            object obj = serializer.Deserialize(reader);
            return (T)obj;
        }

　   　/// <summary>
        /// HashTable序列化Xml内容
        /// </summary>
        /// <param name="_Contextxml"></param>
        /// <returns></returns>
        [WebMethod(Description = "WebService传递HashTable值")]
        public Boolean SetHashValue(String _Contextxml)
        {
            Hashtable _Hash = new Hashtable();
            DictionaryEntry[] _DictArray = DeSerializer<DictionaryEntry[]>(_Contextxml,typeof(DictionaryEntry[]));
            foreach (DictionaryEntry _Entity in _DictArray)
            {
                _Hash.Add(_Entity.Key,_Entity.Value);
            }
            return true;
        }

在客户端，序列化HashTable且定义序列化方法，代码如下:

　　   /// <summary>
        /// 序列化数据类型
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="objToXml"></param>
        /// <returns></returns>
        public String Serializer<T>(T objToXml)
        {
            System.IO.StringWriter writer = new System.IO.StringWriter();
            System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(objToXml.GetType());
            serializer.Serialize(writer,objToXml);
            return writer.GetStringBuilder().ToString();
        }

　　  private void ClientSetHashValue()
        {
   
            DemoService.Service1 _Service = new DemoService.Service1();
            Hashtable _Hash = new Hashtable();
            _Hash.Add("User","yifeng");
            _Hash.Add("Address","this is yifeng's Address");
            _Hash.Add("Age","20");

            DictionaryEntry[] _DictEntry = new DictionaryEntry[_Hash.Count];
            _Hash.copyTo(_DictEntry,0);

            String _Context = Serializer<DictionaryEntry[]>(_DictEntry);
            Boolean _Status = _Service.SetHashValue(_Context);
        }

　　到此，调用的服务器、客户端已完成，此外，我们还可以自定义实体类来传递，原理跟传递HashTable差不多，有兴趣的朋友，可以试下！