How can I change only part of a string?

Question

Here is a example xml.

<group>
  <value>
    <Item>1</Item>
    <Item>2</Item>
    ...
    ...
  </value>
</group>

I only want to change betweem \<value> and </value>.<br/>
For example like this.

<group>
  <value>
    &lt;Item&gt;1&lt;/Item&gt;
    &lt;Item&gt;2&lt;/Item&gt;
    ...
    ...
  </value>
</group>

I'm trying with this code.

string change = File.ReadAllText(File1Path);
change = change.Replace("<", "&lt;");
change = change.Replace(">", "&gt;");
File.WriteAllText(File1Path, change);

Thank you!

Answer 1

@fzkim , Welcome to Microsoft Q&A, you could try the following code to change part of a string in the xml file.

Code:

 XDocument doc=XDocument.Load(path);  
    var result = doc.Descendants("value").Descendants().Cast<XElement>().ToList();  
    string elestr=string.Empty;  
 
    for (int i = 0; i < result.Count(); i++)  
    {  
        StringWriter myWriter = new StringWriter();  
        elestr = result[i].ToString();  
        HttpUtility.HtmlEncode(elestr,myWriter);  
        result[i].ReplaceWith(Environment.NewLine+myWriter.ToString()+Environment.NewLine);  
    }  
    doc.Save(path);  
    string txt=File.ReadAllText(path);  
    txt = txt.Replace("&amp;", "&");  
    txt = txt.Replace("&quot;", "\"");  
    File.WriteAllText(path, txt);  
    var lines = File.ReadAllLines(path).Where(line => !String.IsNullOrWhiteSpace(line));  
    File.WriteAllLines(path, lines);  

Note: Please add namespace in your app:

using System.IO;  
using System.Linq;  
using System.Web;  
using System.Xml.Linq;  

Tested result:

Hope this could help you.

Best Regards,
Jack

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