I want to check duplicate element in XML and give alert on label for duplicate element

Question

0.00/5 (No votes)

See more:

XML:-

<?xml version="1.0" encoding="utf-8"?>
<List>
  <Email_Entry></Email_Entry>
  <Email_Entry EmailID="qw@gmail.com" />
  <Email_Entry EmailID="qw@gmail.com" />
  <Email_Entry EmailID="qw@gmail.com" />
  <Email_Entry EmailID="qw@gmail.com" />
  <Email_Entry EmailID="shssh@gmail.com" />
</List>

What I have tried:

aspx.cs:-
<pre>protected void btnEmailSubscribe_Click(object sender, EventArgs e)
        {
            string EmailID = txtEmailSubscribe.Text;
            string FILE_PATH = Server.MapPath("~/Logs/SubscribedEmails.xml");
            XDocument Emailxml = XDocument.Load(FILE_PATH);
            var EmailExist = Emailxml.Descendants("Email_Entry")
                .Any(x => (string)x.Element("EmailID") == txtEmailSubscribe.Text);
            if (EmailExist)
            {
                lblEmail.Text = "EmailID already exist";
            }
            else
            {
                Emailxml.Root.Add(new XElement("Email_Entry",
                           new XAttribute("EmailID", EmailID)
                       ));
                Emailxml.Save(FILE_PATH);
                lblEmail.Text = "Subscribed Successfully";
            }            
        }

can anybody tell whts wrong?

Posted 3-Mar-17 20:14pm

Shridhar Salunkhe

Updated 3-Mar-17 21:10pm

Add a Solution

1 solution

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)

Graeme_Grant · Answer 1 · 2017-03-03T21:08:00

This will return only the duplicated email addresses.

C#

var duplicateEmails 
    = Emailxml.Descendants("Email_Entry")     // email node
                .GroupBy(x => x.Name)         // group by element
                .Where(x => x.Count() > 1)    // select groups where more than 1 found
                .Select(x => x.Key.LocalName) // element contents
                .ToList();