Convert this linq query to list of string type?

Question

1.00/5 (1 vote)

See more:

C#

var item = from items in xdoc.Descendants("database")
                          where (string)items.Element("server") == serv
                          select items.Elements("database").ToList();
               foreach (var items in item)
               {
                   lstDBName.Add(items.ToString());
               }
               return lstDBName;

XML :

XML

<?xml version="1.0" encoding="utf-8"?>

<servers>
    <server>s2
        <database>db1</database>
        <database>db2</database>

    </server>

    <server>s3
        <database>db3</database>
        <database>db4</database>

    </server>

</servers>

Posted 10-Nov-15 22:49pm

Member 12002095

Add a Solution

Comments

Andreas Gieriet 11-Nov-15 5:08am

What exactly do you want to achieve?
Where is the problem?
Andi

Member 12002095 11-Nov-15 5:12am

I want to convert this linq statement into list of string type

Andreas Gieriet 11-Nov-15 5:29am

Your naming scheme is very confusing. You seem to confuse singular and plurals. Even it sounds irrelevant: give decent names to your "item(s)" and you see you get more sense out of it (say: you see that you confuse things). Then try to get stepwise to the correct *query* by splitting into steps and dump by console. E.g. foreach(var item in xdoc.Descendants("database")) Console.Writeline(item);. If this succeeds, extend further, etc.
Regards
Andi

Member 12002095 11-Nov-15 6:02am

Thanks :)

2 solutions

Solution 1

I'd go for XmlDocument and associated items since it's easier there to access items via XPath. E.g.

C#

XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(file);
var xmlQuery =
    xmldoc
    .SelectNodes("/servers/server").Cast<XmlElement>()
    .Where(e => e.SelectSingleNode("text()").Value.Trim() == "s3")
    .SelectMany(e=>e.SelectNodes("database/text()").Cast<XmlText>(), (e,t)=>t.Value.Trim())
    ;
foreach (var item in xmlQuery)
{
    Console.WriteLine(item);
}

Regards
Andi

Posted 11-Nov-15 0:12am

Andreas Gieriet

Updated 11-Nov-15 0:13am

v2

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Maciej Los · Accepted Answer · 2015-11-16T04:00:00

Try this:

C#

string s = @"<?xml version='1.0' encoding='utf-8'?>
<servers><server>s2<database>db1</database><database>db2</database></server>
    <server>s3<database>db3</database><database>db4</database></server>
</servers>";

XDocument xdoc = XDocument.Parse(s);
string serv = "s2";
var servers = xdoc.Descendants("server")
              .Where(x=>x.Value.Substring(0,serv.Length)==serv)
              .SelectMany(x=>x.Descendants("database").Select(d=>d.Value))
              .ToList();

Result (List<string>)

db1
db2

Notes to your query:
A database node (child node) can not look up at server node (parent node).
A server node does not belong to database node, becuase it is up in a hierarchy.