how to read XML node value or name c#

Question

i have below xml.

<Data>
  <DateTime date="05-26-2016">
   <Time time="09:53:46 AM">Test1</Time>
</DateTime>
<DateTime date="05-27-2016">
<Time time="09:54:56 AM">Test2</Time>
</DateTime>
</Data>

i use below code to get the DateTime Name/Value but it is giving null.

xmlDoc.Load(@"E:\testdoc.xml");
XmlElement rootNode = xmlDoc.DocumentElement;
foreach (XmlElement a in rootNode.ChildNodes)
        {
            var attributeValue = a.GetAttribute("Value");
            if (a.Attributes["Value"].Value == attribute2.Value)
            {
                a.AppendChild(userChildNode2);
            }
        }

the required output for "attributeValue" should be "05-26-2016"/05-27-2016 in foreach loop. can some one let me know what i am missing.

Answer 1

In your Xml there is no attribute with the name Value , that could be a reason you are receiving null.

a.GetAttribute("Value"); // Will return null. 

I suggest, you could use XDocument and do this.

XDocument doc = XDocument.Load(filename);       
var fmatch = doc.Root.Elements("DateTime")
                      .FirstOrDefault(x=>x.Attribute("date").Value == attribute2.Value);

if(fmatch!= null)
{
    fmatch.Add(new XElement("child", "value")); // use details you would like to add as an element. 
}

// add attribute in element use below

        if (fmatch != null)
        {
            fmatch.Add( new XElement("Time", new XAttribute("time", DateTime.Now.ToString("hh:mm:ss tt")),"Test append in same date"));  
            doc.Save(@"E:\testdoc.xml");
        }

if you want to do it for all elements use Where clause

var matches = doc.Root.Elements("DateTime")
                      .Where(x=>x.Attribute("date").Value == attribute2.Value);

foreach(var match in matches)
{
    // logic here.
}

Take a look at this Demo