CODEWITHSUNDEEP
c#linq
user3346509
user3346509

Reputation: 57

Check if Element content exist in XML file

Here is my XML file

<Customer>
  <PrivateCustomer>
    <Adresse>USA</Adresse>
    <Phone>12345678</Phone>
    <Name>Zaghi</Name>
    <Age>20</Age>
    <Sex>Man</Sex>
  </PrivateCustomer>
  <PrivateCustomer>
    <Adresse>USA</Adresse>
    <Phone>12345678</Phone>
    <Name>John</Name>
    <Age>22</Age>
    <Sex>Woman</Sex>
  </PrivateCustomer>
</Customer>

I dont want to have duplicates Phone numbers. When i enter a phone number into a textbox i want it to check if the number already exist or no. If it exist there should come an error.

Here is a small part of my C# code:

XDocument doc = new XDocument();
doc = XDocument.Load("PrivateCustomer.xml");

var NumberExist = doc.Descendants("PrivateCustomer").Where(x => !x.Elements("Phone").Any());


if (NumberExist != null)
{
    MessageBox.Show("Number already exist");
}

Upvotes: 0

Views: 791

Answers (1)

Selman Gen&#231;
Selman Gen&#231;

Reputation: 101681

You can use Any method:

XDocument doc = XDocument.Load("PrivateCustomer.xml");
var NumberExist = doc.Descendants("PrivateCustomer")
                .Any(x => (string)x.Element("Phone") == textBox1.Text);

if(NumberExist)
{ 
    MessageBox.Show("Number already exist");
}

If all PrivateCustomers have at least one Phone,your query will always return null.Just use a condition with Any and check if there is a PrivateCustomer with a given phone number.

Upvotes: 1

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