C＃：檢查XML中的重複元素

XML：

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

aspx.cs：

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"; 
    }    
}

來源

2017-03-04 Shridhar Salunkhe

檢查屬性值，而不是元素：

var EmailExist = Emailxml.Descendants("Email_Entry") 
     .Any(x => x.Attribute("EmailID").Value == txtEmailSubscribe.Text);

來源

2017-03-04 07:16:02 Backs

應該在哪裏而不是任何。任何將返回true/false， – jdweng

@jdweng當我檢查電子郵件存在我使用'任何' – Backs

@Backs謝謝你的幫助!!!!!!! –

VAR XML = File.ReadAllText（「XML文件路徑「）;

 var xmlDoc = new XmlDocument(); 
     xmlDoc.LoadXml(xml); 

     var dups = xmlDoc.FirstChild.ChildNodes 
      .Cast<XmlNode>() 
      .Where(n=>n.Attributes.Count>0) 
      .GroupBy(n => n.Attributes["EmailID"].Value) 
      .Where(g => g.Count() > 1) 
      .SelectMany(g => g.ToList()) 
      .ToList();

來源

2017-03-04 11:01:07

C＃：檢查XML中的重複元素

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