我如何在C＃中更新XML文件

Question

I write console application program this is my xml file :

    <?xml version="1.0" encoding="utf-8" ?>
    <Settings>
      <AsteriskHost type="string">172.16.18.14</AsteriskHost>

</Settings>

I run this code

   public void Set(List<AcmSettings> acmSettings)
    {
        XElement xelement = XElement.Load("Settings.xml");
        IEnumerable<XElement> settings = xelement.Elements();
        foreach (var item in acmSettings)
        {
            settings.FirstOrDefault(x => x.Name == item.Name).SetValue("treeee");
        }
        xelement.Save("Settings.xml");
    }

this my test:

[Test]
public void SetShouldUpdateValue()
{
    var settingsManager = new SettingsManager();
    const string newIp = "165.166.167.167";
    const string elemntName = "AsteriskHost";
    var acmSetting = new List<AcmSettings> { new AcmSettings { Name = elemntName, Value = newIp } };
    settingsManager.Set(acmSetting);
    var setting = settingsManager.Get(x => x.Name == elemntName).FirstOrDefault();
    Assert.IsTrue(setting != null);
    Assert.IsTrue(setting.Value== newIp);

}

I don't have any error but my new value not save in file.

How can I update xml node in c#

Answer 1

I tried your Set method, and it runs ok for me. I did have to tweak your current implementation by changing just one line:

// settings.FirstOrDefault(x => x.Name == item.Name).SetValue("treeee");
settings.FirstOrDefault(x => x.Name == item.Name).SetValue(item.Value);

Perhaps the problem is with your Get method. Here is a quick (not production quality) Get implementation. Using this implementation, your unit test runs successfully.

// note - just a string (name) passed in
public XElement Get(string name)
{
    XElement xelement = XElement.Load("Settings.xml");
    IEnumerable<XElement> settings = xelement.Elements();

    return settings.FirstOrDefault(x => x.Name == name);
}

The other possibility is that, as suggested in the comments above, is that you are looking at your project XML file, and not looking at the output XML file.

Answer 2

Try like this

 XmlDocument xmlDom = new XmlDocument();
 xmlDom.Load("YourXMLFILEPATH.xml");
 XmlNode newXMLNode = xmlDom.SelectSingleNode("/Settings/AsteriskHost");
 newXMLNode.InnerText = YourValue;
 xmlDom.Save("YourXMLFILEPATH.xml");
 Console.WriteLine(xmlDom);

Have you tried this ?

Answer 3

You can modify your set method like this.

    public void Set(List<AcmSettings> acmSettings)
    {
        XElement xelement = XElement.Load("Settings.xml");
        IEnumerable<XElement> settings = xelement.Elements();
        foreach (var item in acmSettings)
        {
            xelement.Descendants(item.Name).FirstOrDefault().Value = item.Value;
        }
        xelement.Save("Settings.xml");
    }