哈希表的XML序列化（C＃3.0） [英] XML serialization of hash table(C#3.0)

问题描述

我正在尝试序列化哈希表但没有发生

  private void Form1_Load（object sender，EventArgs e）
 {
 Hashtable ht = new Hashtable（）; 
 
 DateTime dt = DateTime.Now; 
 for（int i = 0; i< 10; i ++）
 ht.Add（dt.AddDays（i），i）; 
 SerializeToXmlAsFile（typeof（Hashtable），ht）; 
} 
 
私人无效SerializeToXmlAsFile（Type targetType，Object targetObject）
 {
 try 
 {
 string fileName = @ C：＼ ＼output.xml； 
 //序列化为XML 
 XmlSerializer s = new XmlSerializer（targetType）; 
 TextWriter w =新的StreamWriter（fileName）; 
 s.Serialize（w，targetObject）; 
 w.Flush（）; 
 w.Close（）; 
} 
 catch（异常例外）{抛出异常； } 
} 
  

在Google搜索后，我发现无法对推动IDictonary的对象进行序列化。但是，我在二进制序列化方面取得了成功。

但是我想拥有一个xml。

我正在使用C＃3.0

谢谢

解决方案

首先从C＃2.0开始，您可以使用非常旧的 Hashtable 的类型安全版本来自.NET 1.0。因此，您可以使用 Dictionary< DateTime，int> 。

从.NET 3.0开始，您可以使用 DataContractSerializer 。因此，您可以像下面这样重写代码

  private void Form1_Load（object sender，EventArgs e）
 {
 MyHashtable ht =新的MyHashtable（）; 
 
 DateTime dt = DateTime.Now; 
 for（int i = 0; i< 10; i ++）
 ht.Add（dt.AddDays（i），i）; 
 SerializeToXmlAsFile（typeof（Hashtable），ht）; 
} 
  

其中 SerializeToXmlAsFile 和您定义的 MyHashtable 类型如下：

  [CollectionDataContract（Name = AllMyHashtable，ItemName = MyEntry，
 KeyName = MyDate，ValueName = MyValue））] 
公共类MyHashtable：Dictionary< DateTime，int> {} 
 
 private void SerializeToXmlAsFile（Type targetType，Object targetObject）
 {
 try {
 string fileName = @ C：\output.xml; 
 DataContractSerializer s =新的DataContractSerializer（targetType）; 
 XmlWriterSettings设置=新的XmlWriterSettings（）; 
 settings.Indent = true; 
 settings.IndentChars =（）; 
使用（XmlWriter w = XmlWriter.Create（文件名，设置））{
 s.WriteObject（w，targetObject）; 
 w.Flush（）; 
} 
} 
 catch（异常例外）{抛出异常； } 
} 
  

这段代码产生 C：\output.xml 文件，其中包含以下内容：

 <？xml version = 1.0 encoding = utf-8？> ; 
< AllMyHashtable xmlns：i = http://www.w3.org/2001/XMLSchema-instance 
 xmlns = http://schemas.datacontract.org/2004/07/DataContractXmlSerializer > 
< MyEntry> 
< MyDate> 2010-06-09T22：30：00.9474539 + 02：00< / MyDate> 
< MyValue> 0< / MyValue> 
< / MyEntry> 
< MyEntry> 
< MyDate> 2010-06-10T22：30：00.9474539 + 02：00< / MyDate> 
< MyValue> 1< / MyValue> 
< / MyEntry> 
<！-...-> 
< / AllMyHashtable> 
  

所以我们如何查看可以自由定义的目标XML文件元素的所有名称。 / p>

Hi I am trying to serialize a hash table but not happening

private void Form1_Load(object sender, EventArgs e)
        {
            Hashtable ht = new Hashtable();        

            DateTime dt = DateTime.Now;
            for (int i = 0; i < 10; i++)
                ht.Add(dt.AddDays(i), i);           
            SerializeToXmlAsFile(typeof(Hashtable), ht);
        }

private void SerializeToXmlAsFile(Type targetType, Object targetObject)
        {
            try
            {
                string fileName = @"C:\output.xml";
                //Serialize to XML
                XmlSerializer s = new XmlSerializer(targetType);
                TextWriter w = new StreamWriter(fileName);
                s.Serialize(w, targetObject);
                w.Flush();
                w.Close();
            }
            catch (Exception ex) { throw ex; }
        }

After a google search , I found that objects that impelment IDictonary cannot be serialized. However, I got success with binary serialization.

But I want to have xml one. Is there any way of doing so?

I am using C#3.0

Thanks

解决方案

First of all starting with C# 2.0 you can use type safe version of very old Hashtable which come from .NET 1.0. So you can use Dictionary<DateTime, int>.

Starting with .NET 3.0 you can use DataContractSerializer. So you can rewrite you code like following

private void Form1_Load(object sender, EventArgs e)
    {
        MyHashtable ht = new MyHashtable();        

        DateTime dt = DateTime.Now;
        for (int i = 0; i < 10; i++)
            ht.Add(dt.AddDays(i), i);           
        SerializeToXmlAsFile(typeof(Hashtable), ht);
    }

where SerializeToXmlAsFile and MyHashtable type you define like following:

[CollectionDataContract (Name = "AllMyHashtable", ItemName = "MyEntry",
                         KeyName = "MyDate", ValueName = "MyValue")]
public class MyHashtable : Dictionary<DateTime, int> { }

private void SerializeToXmlAsFile(Type targetType, Object targetObject)
    {
        try {
            string fileName = @"C:\output.xml";
            DataContractSerializer s = new DataContractSerializer (targetType);
            XmlWriterSettings settings = new XmlWriterSettings ();
            settings.Indent = true;
            settings.IndentChars = ("    ");
            using (XmlWriter w = XmlWriter.Create (fileName, settings)) {
                s.WriteObject (w, targetObject);
                w.Flush ();
            }
        }
        catch (Exception ex) { throw ex; }
    }

This code produce C:\output.xml file with the following contain:

<?xml version="1.0" encoding="utf-8"?>
<AllMyHashtable xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://schemas.datacontract.org/2004/07/DataContractXmlSerializer">
    <MyEntry>
        <MyDate>2010-06-09T22:30:00.9474539+02:00</MyDate>
        <MyValue>0</MyValue>
    </MyEntry>
    <MyEntry>
        <MyDate>2010-06-10T22:30:00.9474539+02:00</MyDate>
        <MyValue>1</MyValue>
    </MyEntry>
    <!-- ... -->
</AllMyHashtable>

So how we can see all names of the elements of the destination XML files we can free define.

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