反序列化

<?xml version="1.0" encoding="utf-8" ?>
<OrderedItem>
<ItemName>Widget</ItemName>
<Description>Regular Widget</Description>
<UnitPrice>2.3</UnitPrice>
<Quantity>10</Quantity>
<LineTotal>23</LineTotal>
</OrderedItem>

------------------------------------
using System;
using System.IO;
using System.Text;
using System.Xml;

using System.Diagnostics;
using System.Xml.Serialization;

// This is the class that will be deserialized.
public class OrderedItem
{
 public string ItemName;
 public string Description;
 public decimal UnitPrice;
 public int Quantity;
 public decimal LineTotal;
 // A custom method used to calculate price per item.
 public void Calculate()
 {
  LineTotal = UnitPrice * Quantity;
 }
}
 
public class Test
{
 public static void Main()
 {
  Test t = new Test();
  // Read a purchase order.
  t.DeserializeObject("simple.xml");
 }
 private void DeserializeObject(string filename)
 {  
  Console.WriteLine("Reading with TextReader");

  // Create an instance of the XmlSerializer specifying type.
  XmlSerializer serializer =
   new XmlSerializer(typeof(OrderedItem));

  OrderedItem i;

  DateTime dt = System.DateTime.Now;
  //方法1 TextReader reader = new StreamReader(filename, Encoding.Default);
  //方法2 Stream reader= new FileStream(filename,FileMode.Open);
  FileStream fs = new FileStream(filename, FileMode.Open);
  XmlReader reader = new XmlTextReader(fs);

  i = (OrderedItem) serializer.Deserialize(reader);
  Debug.WriteLine((System.DateTime.Now - dt).ToString());
  Debug.WriteLine(i.ItemName);
 }
}


方法2和方法3比较快一点。