在xml中創建新節點

Question

有人能給我一個關於這個代碼有什麼問題的指針。 這個想法是，如果xml文件找到匹配項，它會使用新數據更新現有節點，如果它找不到匹配項，則會使用所需數據創建新節點。 但是，如果我刪除創建新節點的代碼，而不是僅更新它創建的副本，它應該更新它。這是循環的問題。？

ListBoxItem mySelectedItem = listBox5.SelectedItem as ListBoxItem; 
     string image = mySelectedItem.Content.ToString(); 
     XmlDocument xXMLTVDoc = new XmlDocument(); 
     xXMLTVDoc.Load(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + (@"\Media Center Themer") + @"\MCTDefault.xml"); 
     XmlNodeList xNodes = xXMLTVDoc.SelectNodes(@"/MediaCenterThemer/Resources/Rcdata/Resource"); 
     XmlNode xNod = xXMLTVDoc.SelectSingleNode(@"/MediaCenterThemer/Resources/Rcdata/Resource"); 
     string text1 = ""; 

     if (listBox5.SelectedItem == null) 
     { 
      System.Windows.MessageBox.Show("Please select image.", "No Image Selected", MessageBoxButton.OK); 
     } 
     else if (this.listBox5.SelectedItem != null) 
     { 
      OpenFileDialog1.Title = "Select your Image"; 
      OpenFileDialog1.Filter = "PNG|*.png|All files|*.*"; 
      OpenFileDialog1.RestoreDirectory = true; 
      OpenFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures); 

      System.Windows.Forms.DialogResult result = OpenFileDialog1.ShowDialog(); 

      if (result == System.Windows.Forms.DialogResult.OK) 
      { 
       text1 = OpenFileDialog1.FileName; 
       try 
       { 
        foreach (XmlNode xNode in xNodes) 
        { 
         if (image.Equals("COMMON.BACKGROUND.PNG")) 
         { 
          if (xNode.Attributes[0].Value == "COMMON.BACKGROUND.PNG") 
          { 
           xNode.FirstChild.Attributes[0].Value = text1; 
           xXMLTVDoc.Save(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + (@"\Media Center Themer") + @"\MCTDefault.xml"); 
           break; 
          } 
          else if (xNode.Attributes[0].Value != mySelectedItem.Content.ToString()) 
          { 
           XmlElement node = xXMLTVDoc.CreateElement("Resource"); 
           node.SetAttribute("Id", mySelectedItem.Content.ToString()); 
           XmlNode parent1 = xNod.ParentNode; 
           XmlElement nodeTitle = xXMLTVDoc.CreateElement("Replace"); 
           nodeTitle.SetAttribute("File", text1); 
           node.AppendChild(nodeTitle); 
           parent1.AppendChild(node); 
           xXMLTVDoc.Save(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + (@"\Media Center Themer") + @"\MCTDefault.xml"); 
          } 
         } 

         else if (image.Equals("COMMON.ANIMATED.BACKGROUND.PNG")) 
         { 
          if (xNode.Attributes[0].Value == "COMMON.ANIMATED.BACKGROUND.PNG") 
          { 
           xNode.FirstChild.Attributes[0].Value = text1; 
           xXMLTVDoc.Save(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + (@"\Media Center Themer") + @"\MCTDefault.xml"); 
           break; 
          } 
          else if (xNode.Attributes[0].Value != mySelectedItem.Content.ToString()) 
          { 
           XmlElement node = xXMLTVDoc.CreateElement("Resource"); 
           node.SetAttribute("Id", mySelectedItem.Content.ToString()); 
           XmlNode parent1 = xNod.ParentNode; 
           XmlElement nodeTitle = xXMLTVDoc.CreateElement("Replace"); 
           nodeTitle.SetAttribute("File", text1); 
           node.AppendChild(nodeTitle); 
           parent1.AppendChild(node); 
           xXMLTVDoc.Save(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + (@"\Media Center Themer") + @"\MCTDefault.xml"); 
          } 
         } 
        } 
       } 

       catch (Exception) 
       { 
        MessageBox.Show("Could Not assign Image"); 
       } 

這裏是XML：

<?xml version="1.0" encoding="UTF-8"?> 
<!-- Change the main colors of Media Center to shades of green --> 
<MediaCenterThemer xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="MCTSchema.xsd"> 
<TextFormat> 
<!-- Color: OffWhite --> 
<Text Color="rgb(242,242,242)"> 
    <Replace Color="rgb(130,240,130)" /> 
</Text> 
<!-- Color: LightBlue --> 
<Text Color="rgb(151,217,255)"> 
    <Replace Color="rgb(80,200,80)" /> 
</Text> 
<!-- Color: MediumBlue --> 
<Text Color="rgb(2,166,212)"> 
    <Replace Color="rgb(10,160,10)" /> 
</Text> 
</TextFormat> 
<Legacy> 
<!-- Legacy strings (settings). Color: OffWhite --> 
<String Color="rgb(242,242,242)"> 
    <Replace Color="rgb(115,200,110)" /> 
</String> 
<!-- Legacy strings (settings). Color: LightBlue --> 
<String Color="rgb(151,217,255)"> 
    <Replace Color="rgb(70,150,60)" /> 
</String> 
</Legacy> 
<Resources> 
<Rcdata> 
<!-- Picture Resources. Modification of the default background --> 
<Resource Id="COMMON.BACKGROUND.PNG"> 
<Replace File="C:\Users\Public\Pictures\CITV.png" /> 
</Resource> 
<Resource Id="COMMON.ANIMATED.BACKGROUND.PNG"> 
<Replace File="Theme\bkg-demo.jpg"/> 
</Resource> 
</Rcdata> 
</Resources> 
</MediaCenterThemer> 

感謝

Answer 1

你可以做這樣的事情

 bool doesNodeExist = false; 
    foreach (XmlNode xNode in xNodes) 
        { 
         if (image.Equals("COMMON.BACKGROUND.PNG")) 
         { 
          if (xNode.Attributes[0].Value == "COMMON.BACKGROUND.PNG") 
          { 
doesNodeExist = true; 
           xNode.FirstChild.Attributes[0].Value = text1; 
           xXMLTVDoc.Save(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + (@"\Media Center Themer") + @"\MCTDefault.xml"); 
           break; 
          } 
         } 
        } 
     if(!doesNodeExist) 
     { 
      //Create Logic here... 
     }