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Alternatives to XDocument and XmlDocument for loading xml files in C#?

I want to change an attribute inside an xml file using C#.
Here is a sample XML file
<?xml version="1.0" encoding="us-ascii"?>
<Client>
<Age>25</Age>
<Weight>50</Weight>
</Client>
I tried loading the xml file using both XmlDocument and XDocument. They both take so much time (more than 5 minutes) to load.
Here is the code I am using to load the file:
string filePath = #"myFile.xml";
XmlDocument xmlData = new XmlDocument();
As per Google, the problem is that XDocument and XmlDocument will load all the DTDs for XML file, and this is why it takes much time. Is there a workaround for this? or maybe any alternative that allows me to change an attribute without loading all the DtDs?

You can control how DTDs are cached, parsed or used for validation with XmlReaderSettings and still use XDocument.
If you can take the time to cache the DTDs and changing them isn't part of your test, you could take the hit once and cache them.
If that's too much time or they aren't available and they aren't needed for your tests, you could skip DTD processing.
using (var reader = XmlReader.Create(_,
new XmlReaderSettings
{
DtdProcessing = DtdProcessing.Ignore,
ValidationType = ValidationType.None,
//DtdProcessing = DtdProcessing.Parse,
//ValidationType = ValidationType.DTD,
XmlResolver = new XmlUrlResolver
{
CachePolicy = new RequestCachePolicy(RequestCacheLevel.CacheIfAvailable),
//CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore),
}
}))
{
var doc = XDocument.Load(reader);
//…
}
XmlReaderSettings has many other properties that sometimes come in handy.

Converting xml to json with json.net

I try to convert my XML String to Json with Json.Net
In the Json.Net Documentation it says that i have to use this code to convert xml to json:
string xml = #"<person id='1'>
<name>Alan</name>
<url>http://www.google.com</url>
<role>Admin1</role>
</person>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
string json = JsonConvert.SerializeXmlNode(doc);
But in my Windows 8 App i can't find the XmlDocument class neither the SerializeXmlNode.
I tried it with these classes and functions:
var result = await response.Content.ReadAsStringAsync();
XDocument xdoc = new XDocument();
xdoc = XDocument.Load(result);
// Parse the JSON Radio data
string jsonText = JsonConvert.SerializeXNode(xdoc);
var radios = JsonArray.Parse(result);
But i get the following error:
An exception of type 'System.ArgumentException' occurred in mscorlib.dll but was not handled in user code
Additional information: Illegal characters in path.
If there is a handler for this exception, the program may be safely continued.
In result i have the correct xml loaded. Starting with:
<?xml version="1.0" encoding="utf-8"?>
<item>...</item>

use XDocument.Parse instead of XDocument.Load which loads the xml from an url

Read XML values Webservice

I want to read xml on runtime, without save it on a path
After my searching i find that, In console application i need to use Console.Out for displaying result
xmlSerializer.Serialize(Console.Out, patient);
In Windows / Web Application we need to set path like
StreamWriter streamWriter = new StreamWriter(#"C:\test.xml");
but i need to read xml with out save it, i am using Webserive where i need to read it and take a decision that either it is valid or not
I hope i define it clearly..

Use the XmlDocument object.
There are several ways to load the XML, you can use the XmlDocument.Load() and specify your URL in there or use XmlDocument.LoadXml() to load the XML from a string.

You could use the XmlDocument.LoadXml class to read the received xml. There is no need to save it to disk.
try
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(receivedXMLStr);
//valid xml
}
catch (XmlException xe)
{
//invalid xml
}

Use Linq2Xml..
XElement doc;
try
{
doc=XElement.Load(yourStream);
}
catch
{
//invalid XML
}
foreach(XElement node in doc.Descendants())
{
node.Value;//value of this node
nodes.Attributes();//all the attributes of this node
}

Thanks all of you for your reply, i want to laod my XML without save it on a local Path, because saving creating many XML.
Finally i find the solutions for load the XML from class on a Memory stream, I thinn this solution is very easy and optimize
XmlDocument doc = new XmlDocument();
System.Xml.Serialization.XmlSerializer serializer2 = new System.Xml.Serialization.XmlSerializer(Patients.GetType());
System.IO.MemoryStream stream = new System.IO.MemoryStream();
serializer2.Serialize(stream, Patients);
stream.Position = 0;
doc.Load(stream);

You need to use the Deserialize option to read the xml. Follow the below steps to achieve it,
Create a target class. It structure should represent the xml output.
After creating the class, use the below code to load your xml into the target object
TargetType result = null;
XmlSerializer worker = new XmlSerializer(typeof(TargetType));
result = worker.Deserialize("<xml>.....</xml>");
Now the xml is loaded into the object 'result' and use it.

Validate xml against dtd from string

I have an xml file that refers to a local dtd file. But the problem is that my files are being compressed into a single file (I am using Unity3D and it puts all my textfiles into one binary). This question is not Unity3D specific, it is useful for anyone that tries to load a DTD schema from a string.
I have thought of a workaround to load the xml and load the dtd separately and then add the dtd file to the XmlSchemas of my document. Like so:
private void ReadConfig(string filePath)
{
// load the xml file
TextAsset text = (TextAsset)Resources.Load(filePath);
StringReader sr = new StringReader(text.text);
sr.Read(); // skip BOM, Unity3D catch!
// load the dtd file
TextAsset dtdAsset = (TextAsset)Resources.Load("Configs/condigDtd");
XmlSchemaSet schemaSet = new XmlSchemaSet();
schemaSet.Add(...); // my dtd should be added into this schemaset somehow, but it's only a string and not a filepath.
XmlReaderSettings settings = new XmlReaderSettings() { ValidationType = ValidationType.DTD, ProhibitDtd = false, Schemas = schemaSet};
XmlReader r = XmlReader.Create(sr, settings);
XmlDocument doc = new XmlDocument();
doc.Load(r);
}
The xml starts like this, but the dtd cannot be found. Not strange, because the xml file was loaded as a string, not from a file.
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Scene SYSTEM "configDtd.dtd">

XmlSchema has a Read method that takes in a Stream and a ValidationEventHandler. If the DTD is a string, you could convert it to a stream
System.Text.Encoding encode = System.Tet.Encoding.UTF8;
MemoryStream ms = new MemoryStream(encode.GetBytes(myDTD));
create the XmlSchema
XmlSchema mySchema = XmlSchema.Read(ms, DTDValidation);
add this schema to the XmlDocument containing the xml you are validating
myXMLDocument.Schemas.Add(mySchema);
myXMLDocument.Schemas.Compile();
myXMLDocument.Validate(DTDValidation);
The DTDValidation() handler would contain code handling what to do if the xml is invalid.

How to append ChildNodes of a xml documents into root of another (web services)?

I've created a [WebMethod] on ASP.NET Web Service which reads XML documents from different web services (ASP.NET and PHP services).
Once the documents are read, they are merged into a XML and returned.
The method can successfully read XML documents from each web service but when I try to append second XML into first one, I get ArgumentException and a message like this The node to be inserted is from a different document context. I can't find a problem, can it be something to do with the source of document? but then both document are exactly same (have same elements).
Why ArgumentException? What am I missing?
[WebMethod]
public XmlDocument getRestaurants(String search_keywords)
{
XmlDocument xmlDom1 = new XmlDocument();
xmlDom1 = getRestaurantFromAspNetWS(search_keywords);
XmlTextReader myXmlTextReader =
new XmlTextReader
("http://some-iss.green.com/username/search.php?s=" + search_keywords);
XmlDocument xmlDom2 = new XmlDocument();
xmlDom2.Load(myXmlTextReader);
foreach (XmlElement xmlNode in xmlDom2.DocumentElement.ChildNodes)
{
//trying to append childNodes of xmlDom2 into xmlDom1
//and this is where i get ArgumentException
xmlDom1.DocumentElement.AppendChild(xmlNode);
}
return xmlDom1;
}

You need to import the node with importNode()
something like this:
xmlDom1.DocumentElement.importNode(xmlNode, true);

Can you write it like this?
public XElement getRestaurants(String search_keywords)
{
XElement result = getRestaurantFromAspNetWS(search_keywords);
XmlTextReader myXmlTextReader = new XmlTextReader
("http://some-iss.green.com/username/search.php?s=" + search_keywords);
XElement reader = XElement.Load(myXmlTextReader);
foreach (XElement child in reader.Elements())
result.Add(child);
return result;
}
The real trick is getting your custom getRestaurantFromAspNetWS function to return a XElement instead of a XmlDocument, as you didn't provide us with that function, I can't help you there.