Read/update XML document class

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sorry first, but I'm relay noob and I try to learn .

I have an Xml document like xmldoc.xml

<root>
    <one>first_one</one>
    <two>second_one</two>
    <tree>third_one</tree>
    <four>fourth_one</four>
    <five>fifth_one</five>
    <six>sixth_one</six>
</root>

What I have tried:

my problem is I try to read and/or update one or more elements inside my root node.
To be honest I don't have a clue how.

I try serializer but I stack because don't know to create class like I will try to explain:

C#

XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(xmldoc.xml);
XmlNode root = xmldoc.FirstChild;

//create select_array[] = { one, tree four}
//create array new_val[] = {one => "first_second", tree => "tree_second", four => "four_second" }

// 1. create a class read_array values of one, tree four
// 2. create class save_array_new values of one, tree four

I don't know to create class read or save in this kind of way to can change one , two .. or all nodes values

up I write is only my idea to use array but i don't think is good

Posted 2-Feb-19 4:02am

sz3bbylA

Updated 4-Feb-19 7:03am

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[no name] 3-Feb-19 6:03am

Here Solution 1 would probably help: read and update XML file using C#[^]

2 solutions

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RickZeeland · Answer 1 · 2019-02-03T00:54:00

Solution 1

Here is a simple example using XElement:

            string TestXml = @"<root>
    <one>first_one</one>
    <two>second_one</two>
    <tree>third_one</tree>
    <four>fourth_one</four>
    <five>fifth_one</five>
    <six>sixth_one</six>
</root>";

            XElement x = XElement.Parse(TestXml);
            var one = x.Element("one");
            one.Value = "CHANGED ONE";
            x.Element("two").Remove();

            foreach (var item in x.Elements())
            {
                Debug.Print(item.ToString());
            }

If you prefer using XDocument, this is not much different, you will have to remember to use the root, see explanation here: Querying an XDocument vs. Querying an XElement (C#) | Microsoft Docs[^]
But as the MSDN documentation states:

Quote:
In many cases, your application will not require that you create a document. By using the XElement class, you can create an XML tree, add other XML trees to it, modify the XML tree, and save it.

XDocument Class Overview (C#) | Microsoft Docs[^]

Note that you only need XmlDocument when using .NET version 3.0 or lower.

Posted 3-Feb-19 0:54am

RickZeeland

Updated 3-Feb-19 7:00am

v4

Comments

Maciej Los 3-Feb-19 12:14pm

Well... OP wants to use XmlDocument class, instead of XDocument...

RickZeeland 3-Feb-19 12:53pm

See the updated solution :)

Maciej Los 3-Feb-19 13:23pm

Much better!

sz3bbylA 4-Feb-19 13:21pm

Data at the root level is invalid. Line 1, position 1.
I not expert, srry, i don't know to use it

RickZeeland 4-Feb-19 14:17pm

You have to place it inside a method, e.g. Main in Program.cs or any other method, good luck !
Note that this is an Winforms example that might not work with WPF.

sz3bbylA 4-Feb-19 18:13pm

I already done something like :
xmldoc.xml
Hide Copy Code
<root>
<one>first_one
<two>second_one
<tree>third_one <four>fourth_one
<five>fifth_one
<six>sixth_one

Hide Copy Code
class Use_Xml
{
public static void Save_data(object obj, string filename)
{
XmlSerializer sd = new XmlSerializer(obj.GetType());
TextWriter writer = new StreamWriter(filename);
sd.Serialize(writer, obj);
writer.Close();
}
}

Hide Copy Code
public class Setting
{
private string one_val;
private string two_val;
private string tree_val;
private string four_val;
private string five_val;
private string six_val;

public string One
{
get { return one_val; }
set { one_val = value; }
}
.......................................
public string Six
{
get { return six_val; }
set { six_val = value; }
}
}

I call it with:

Hide Copy Code
Setting set = new Setting
{
One = "one_second",
...................
Six = "six_second"
}
Use_Xml.Save_data(set, location_file);

This One only can update all values

My problem is
1. I want to update one, two or all values
2. I want to read one, two ... or all values

I try to use deserializer but i was stack

i see some solutions but not fit with my situation
i would like to do a setting file to save parameters of program to be loaded on Window_Loaded
the problem i want just to update parameters also to read one, or more parameters

RickZeeland 4-Feb-19 18:38pm

I think it is better to post this as a new Question, as this is totally different from your original question. Also try to study on application settings in C# there is enough information available, just Google on "C# application settings".

Maciej Los · Answer 2 · 2019-02-03T06:23:00

Please, refer MSDN documentation: XmlDocument Class (System.Xml) | Microsoft Docs[^], especially Find nodes[^] and Edit nodes.
You might be interested in Select Nodes Using XPath Navigation[^]

[EDIT]
According to the OP requirements (posted in solution 3):

Quote:
I Want to keep the xml file like it is
1. The only think I need is to create class like read one, two, tree or all values elements
2. one class to update one, two, tree or all values elements

I'd recommend to change your xml structure to this one:

HTML

<MyItems>
    <MyItem id = "first">first one</Item>
    <MyItem id = "second">first one</Item>
    <MyItem id = "third">first one</Item>
    <MyItem id = "fourth">first one</Item>
    <!-- and so on -->
</MyItems>

A class representing single item this may look like:

C#

public class MyItem
{
	public string id = "first";
	public string text = "first_one";  
}

Finally, you need a collection of MyItem.

For further details, please read my tip: A Complete Sample of Custom Class Collection Serialization and Deserialization[^]. True, it's written in Vb.net, but you have to handle it, because Vb.net is pretty similar to C#.