我想检查XML中的重复元素，并在标签上为重复元素提供警报 [英] I want to check duplicate element in XML and give alert on label for duplicate element

问题描述

XML： -

<？xml version =1.0encoding =utf-8？> 
< List> 
< Email_Entry>< / Email_Entry> 
< Email_Entry EmailID =[e-mail]/> 
< Email_Entry EmailID =[e-mail]/> 
< Email_Entry EmailID =[e-mail]/> 
< Email_Entry EmailID =[e-mail]/> 
< Email_Entry EmailID =[e-mail]/> 
< / List> 

我尝试过：

 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已存在; 
} 
其他
 {
 Emailxml.Root.Add（新XElement（Email_Entry，
新XAttribute（EmailID，EmailID）
） ）; 
 Emailxml.Save（FILE_PATH）; 
 lblEmail.Text =订阅成功; 
} 
} 

任何人都可以说错了吗？

解决方案

这将只返回重复的电子邮件地址。

  var  duplicateEmails 
 = Emailxml.Descendants（  Email_Entry） //  电子邮件节点 
 .GroupBy（x = >  x.Name）< span class =code-comment> //  逐个元素 
 .Where（x = >  x.Count（）>   1 ） //  选择超过1的组 
。选择（x =  >  x.Key.LocalName） //  元素内容 
 .ToList（）; 

XML:-

<?xml version="1.0" encoding="utf-8"?>
<List>
  <Email_Entry></Email_Entry>
  <Email_Entry EmailID="[e-mail]" />
  <Email_Entry EmailID="[e-mail]" />
  <Email_Entry EmailID="[e-mail]" />
  <Email_Entry EmailID="[e-mail]" />
  <Email_Entry EmailID="[e-mail]" />
</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?

解决方案

This will return only the duplicated email addresses.

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();

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