如何使用DOM方法在Visual Studio中讀取XML？我的invoiceData.xml正確嗎？

Question

<?xml version="1.0"?> 
<!-- 
    Created by Wong Kai Chong 
    BSPI 2017 
    Temasek Polytechnic 
--> 

<order> 
    <!-- Simple Type - Main Data --> 
    <invoiceid>0011995</invoiceid> 
    <invoicedate>12/5/2017</invoicedate> 
    <sellerid>0020</sellerid> 
    <buyerid>1231</buyerid> 
    <orderid>9021</orderid> 

    <!-- An Item - Multiple --> 
    <item> 
    <itemid>0001</itemid> 
    <itemname>Apple Macbook Pro</itemname> 
    <description>The best professional laptop for professionals.</description> 
    <quantity>5</quantity> 
    <newunitprice>4950.50</newunitprice> 
    </item> 

    <!-- An Item - Multiple --> 
    <item> 
    <itemid>0002</itemid> 
    <itemname>Microsoft Surface Laptop</itemname> 
    <description>The most versatile professional laptop for experts.</description> 
    <quantity>10</quantity> 
    <newunitprice>3500.90</newunitprice> 
    </item> 

    <!-- An Item - Multiple --> 
    <item> 
    <itemid>0003</itemid> 
    <itemname>Apple iPhone</itemname> 
    <description>The best consumer mobile phone.</description> 
    <quantity>1000</quantity> 
    <newunitprice>500.00</newunitprice> 
    </item> 

    <!-- An Item - Multiple --> 
    <item> 
    <itemid>0004</itemid> 
    <itemname>Samsung Galaxy S8</itemname> 
    <description>The most amazing screen on a phone.</description> 
    <quantity>3000</quantity> 
    <newunitprice>550.00</newunitprice> 
    </item> 

    <!-- Simple Type - Footer Data --> 
    <shippingcharges>7000.00</shippingcharges> 
    <invoicetotalcost>19500.10</invoicetotalcost> 
</order> 

而在這裏的底部是Visual Studio C＃代碼。

 string url = "../../../invoiceData.xml"; 
     XmlReader reader = XmlReader.Create(url); 
     StringBuilder orderList = new StringBuilder(); 
     orderList.Append("Order List: ").Append(Environment.NewLine); 
     int counter = 0; 
     while (reader.ReadToFollowing("item")) 
     { 
      counter++; 
      orderList.Append("Invoice counter: " + counter + Environment.NewLine); 
      reader.ReadToFollowing("invoiceID"); 
      orderList.Append("Invoice ID: " + reader.ReadElementContentAsString() + Environment.NewLine); 

      reader.ReadToFollowing("invoiceid"); 
      orderList.Append("Invoice ID: " + reader.ReadElementContentAsString()); 

      reader.ReadToFollowing("invoicedate"); 
      orderList.Append("Invoice Date: " + reader.ReadElementContentAsString()); 
     }`` 

這將是我的作業。所以你會幫助很多。這裏的問題是我不知道我的invoiceData.xml是否正確。如果是這樣，我該如何編寫代碼來閱讀它們？

string url = "../../invoice1.xml"; // assume args[0] is invoice1.xml 
    XmlReader reader = XmlReader.Create(url); 
    StringBuilder invoiceList = new StringBuilder(); 
    invoiceList.Append("Order List:").Append(Environment.NewLine); 
    int counter = 0; 
    while (reader.ReadToFollowing("order")) //read to each order element 
    { 
     counter++; //increase the counter 
     invoiceList.Append("Order Counter: " + counter + Environment.NewLine); 
     reader.ReadToFollowing("orderID"); //move to orderID element 
     invoiceList.Append("Order ID: " + reader.ReadElementContentAsString() + Environment.NewLine); // read OrderID element content 

     reader.ReadToFollowing("item"); //move to item element 
     int itemCount = 1; 
     invoiceList.Append("item: "+itemCount + reader.ReadElementContentAsString() + Environment.NewLine); // read item element content 

     while (reader.ReadToNextSibling("item")) //move to next item element 
     { 
      itemCount++; 
      invoiceList.Append("item: "+itemCount + reader.ReadElementContentAsString() + Environment.NewLine); // read item element content 
     } 

     reader.ReadEndElement(); 

這段代碼的第三部分給我作爲例子。他們作爲我的樣板進行修改和個性化以適應我的解決方案。如果可以的話，你能以我能理解這些代碼的方式來解釋它嗎？

最佳， KAI

Answer 1

教師可能需要您使用串行類

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Xml; 
using System.Xml.Serialization; 
using System.Globalization; 
using System.IO; 

namespace ConsoleApplication1 
{ 
    class Program 
    { 
     const string INPUT_FILENAME = @"c:\temp\test.xml"; 
     const string OUTPUT_FILENAME = @"c:\temp\test1.xml"; 
     static void Main(string[] args) 
     { 
      XmlSerializer deserializer = new XmlSerializer(typeof(Order)); 
      XmlTextReader reader = new XmlTextReader(INPUT_FILENAME); 

      Order order = (Order)deserializer.Deserialize(reader); 


      XmlSerializer serializer = new XmlSerializer(typeof(Order)); 

      StreamWriter writer = new StreamWriter(OUTPUT_FILENAME); 
      serializer.Serialize(writer, order); 
      writer.Flush(); 
      writer.Close(); 
      writer.Dispose(); 
     } 
    } 

    [XmlRoot("order")] 
    public class Order 
    { 
     public int invoiceid { get; set; } 
     private DateTime _invoicedate { get; set; } 

     public string invoicedate 
     { 
      get { return _invoicedate.ToString("d/m/yyyy"); } 
      set { _invoicedate = DateTime.ParseExact(value, "d/m/yyyy", CultureInfo.InvariantCulture); } 
     } 

     public int sellerid { get; set; } 
     public int buyerid { get; set; } 
     public int orderid { get; set; } 

     [XmlElement("item")] 
     public List<Item> items { get; set; } 

     public decimal shippingcharges { get; set; } 
     public decimal invoicetotalcost { get; set; } 

    } 
    [XmlRoot("item")] 
    public class Item 
    { 
     public int itemid { get; set; } 
     public string itemname { get; set; } 
     public string description { get; set; } 
     public int quantity { get; set; } 
     public decimal newunitprice { get; set; } 
    } 

}