我想遞歸列出xml中的節點

Question

我遞歸地想要顯示xml節點。但不幸的是它不起作用。輸出只是xml文件的第一個元素。爲什麼？

public string GetOutline(int indentLevel, XmlNode xnod) 
{ 
     StringBuilder result = new StringBuilder(); 
     XmlNode xnodWorking; 

     result = result.AppendLine(new string('-', indentLevel * 2) + xnod.Name); 

     if (xnod.NodeType == XmlNodeType.Element) 
     { 
      if (xnod.HasChildNodes) 
      { 
       xnodWorking = xnod.FirstChild; 
       while (xnodWorking != null) 
       { 
        GetOutline(indentLevel + 1, xnodWorking); 
        xnodWorking = xnodWorking.NextSibling; 

       } 
      } 

     } 
     return result.ToString(); 
} 

下面的代碼調用該函數。 XML文件開始<Videos>然後<Video> ...等...

private void button2_Click(object sender, EventArgs e) 
{ 
     SaveFileDialog fDialog = new SaveFileDialog(); 
     fDialog.Title = "Save XML File"; 
     fDialog.FileName = "drzewo.xml"; 
     fDialog.CheckFileExists = false; 
     fDialog.InitialDirectory = @"C:\Users\Piotrek\Desktop"; 

     if (fDialog.ShowDialog() == DialogResult.OK) 
     { 
      using (var newXmlFile = File.Create(fDialog.FileName)); 
      { 
       string xmlTree = fDialog.FileName.ToString(); 

       XmlDocument xdoc = new XmlDocument(); 
       xdoc.Load(XML); 

       XmlNode xnodDE = xdoc.DocumentElement; 

       textBox2.Text = GetOutline(0, xnodDE); 

       //StringBuilder result = new StringBuilder(); 

       /* 
       foreach (var childelement in xdoc.DescendantNodes().OfType<XElement>() 
        .Select(x => x.Name).Distinct()) 
       { 
        result.Append(childelement + Environment.NewLine); 

       } 
       textBox2.Text = result.ToString(); 
       */ 

       using (StreamWriter sw = File.AppendText(xmlTree)) 
       { 
        sw.Write(textBox2.Text); 
       } 
      } 
} 

XML內容：

<Videos> 
    <Video> 
    <Title>The Distinguished Gentleman</Title> 
    <Director>Jonathan Lynn</Director> 
    <Actors> 
     <Actor>Eddie Murphy</Actor> 
     <Actor>Lane Smith</Actor> 
     <Actor>Sheryl Lee Ralph</Actor> 
     <Actor>Joe Don Baker</Actor> 
    </Actors> 
    <Length>112 Minutes</Length> 
    <Format>DVD</Format> 
    <Rating>R</Rating> 
    </Video> 
    <Video> 
    <Title>Her Alibi</Title> 
    <Director>Bruce Beresford</Director> 
    <Length>94 Mins</Length> 
    <Format>DVD</Format> 
    <Rating>PG-13</Rating> 
    </Video> 
</Videos> 

Answer 1

你需要閱讀所有在線文檔線蒙山一個對每個或同時指令

XmlReader reader = XmlReader.Create(your xml file); 
     reader.MoveToContent(); 

     while (reader.Read()) 
     { 
      // your code 
     } 

     reader.Close(); 

不是最好的方式，儘量看看還對LINQ爲xml

Answer 2

您沒有做任何事情來將遞歸調用的結果添加到您正在構建的字符串中。你需要這樣做：

result.Append(GetOutline(indentLevel + 1, xnodWorking)); 

而這種修改應避免文本節點和節點具有相同的名稱：

public string GetOutline(int indentLevel, XmlNode xnod) 
{ 
    StringBuilder result = new StringBuilder(); 
    XmlNode xnodWorking; 

    result = result.AppendLine(new string('-', indentLevel * 2) + xnod.Name); 

    if (xnod.HasChildNodes) 
    { 
     List<string> foundElements = new List<string>(); 
     xnodWorking = xnod.FirstChild; 
     while (xnodWorking != null) 
     { 
      if(xnodworking.NodeType == XmlNodeType.Element && !foundElements.Contains(xnodworking.Name)) 
      { 
       result.Append(GetOutline(indentLevel + 1, xnodWorking)); 
       foundElements.Add(xnodworking.Name); 
      } 
      xnodWorking = xnodWorking.NextSibling; 
     } 
    } 

    return result.ToString(); 
}      

Answer 3

嘗試

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 

using System.Xml; 
using System.Xml.Linq; 

namespace testStackOverflow 
{ 
class Program 
{ 
    static void Main(string[] args) 
    { 

     //Load xml 
     XDocument xdoc = XDocument.Load("test.xml"); 

     //Run query 
     var lv1s = from lv1 in xdoc.Descendants("Video") 
        select new 
        { 
         title = lv1.Element("Title").Value 
        }; 

     //Loop through results 
     foreach (var lv1 in lv1s) 
     { 
      Console.WriteLine(lv1.title); 
     } 

     Console.ReadLine(); 
    } 
} 
}