WebService中Hashtable用法

知识转自这里

code slice 01

　　   /// <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));//还有的解释用FileStream，应该无所谓，没查出serializer.Deserialize参数类型
            System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(type);//告知需要解析的type
            object obj = serializer.Deserialize(reader);//解析后的obj可以直接转换为type类型
            return (T)obj;
        }

code slice 02

　   　/// <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;
        }

注：此函数的功能是避免以Hashtable为参，WebService不允许。

code slice 03

　　   /// <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);//将ibjToXml序列化之后写进writer
            return writer.GetStringBuilder().ToString();
        }

注：System.Xml.Serialization.XmlSerializer序列化

code slice 04

　　  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");
　　　　　　　　　//HashtableToDic
　　　　　　　//DictionaryEntry必须先定义大小
            DictionaryEntry[] _DictEntry = new DictionaryEntry[_Hash.Count];
            _Hash.CopyTo(_DictEntry, 0);//大小和Hashtable不一致也可
　　　　　　  //DicToHashtable
            String _Context = Serializer<DictionaryEntry[]>(_DictEntry);
            Boolean _Status = _Service.SetHashValue(_Context);
        }

Hashtable在WebService中无法使用copy函数拷贝内容至DictionaryEntry,解决方法见code slice 05(关于WebService通信，后续会记录)

code slice 05

proname.DictionaryEntry[] _DictEntry = new proname.DictionaryEntry[_Hash.Count]
int i = 0;
foreach(string keys in _Hash.Keys)
{
    _DictEntry[i] = new proname.DictionaryEntry();//重点！
    _DictEntry[i].Key = keys;
    _DictEntry[i].Value = _Hash[keys];
    i++;
}