LINQ to XML parsing using attributes

Question

I have an xml file like this:

<users>
    <user name="user" password="123" email="[email protected]"/>
</users>

I need to write a code to copy the attribute values to a object type variable and I can't find anything which suits my needs. some part of the code which I have successfully written is:

public static UserInfo GetUser()
{
    XDocument users = XDocument.Load(FilePath.UserConfigurationPath);

    UserInfo usersvar = new UserInfo();
}

Here I have to return the object and compare it with a textbox value.

Can anybody please tell me how I can copy the values to the object?

Using google and the documentation this is a really simple task. What have you tried so far? — Daniel Hilgarth
– Daniel Hilgarth, Commented Aug 29, 2011 at 11:55
@Oskar Not trying to mock, it sounded more like he was using cool-speak with "dis" instead of "this" and "d" instead of "the". Maybe I'm mistaken - just sounded funny. — JohnD
– JohnD, Commented Aug 29, 2011 at 12:01

abatishchev · Accepted Answer · 2011-08-29 12:01:42Z

3

To parse all the users:

IEnumerable<UserInfo> GetUsers()
{
    XDocument users = XDocument.Load(path);

    return from u in users.Descendants("user")
           select new UserInfo
           {
               Name = (string)u.Attribute("name"),
               Password = (string)u.Attribute("password"),
               Email = (string)u.Attribute("email")
           };
}

IEnumerable<UserInfo> users = GetUsers();
UserInfo userUser = users.FirstOrDefault(u => u.Name == "user");

If the document contains exactly one user or you want to parse exactly the first:

XElement userElement = users.Descendants("user").FirstOrDefault();
if (userElement != null)
{
    UserInfo user = new UserInfo
    {
        Name = (string)userElement .Attribute("name"),
        Password = (string)userElement .Attribute("password"),
        Email = (string)userElement .Attribute("email")
    };
}

edited Aug 29, 2011 at 12:01

answered Aug 29, 2011 at 11:55

abatishchev

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5 Comments

Saad Imran. Over a year ago

Are those commas supposed to be there after your type-casts?

Saad Imran. Over a year ago

Yea, i figured the editor put them in and you didn't notice them. Anyways +1

Tyson Over a year ago

Thanks abatishchev, with a little tweak the code is working perfectly.

Jim Wooley Over a year ago

Instead of doing the filter in the FirstOrDefault after you have projected the entity, why not do it in the where clause before the projection. Thay way you are not hydrating objects unnecessarily. I.e. if you have 20 user nodes and your filter criteria matches item 19, you will create 19 instances of the UserInfo class before finding the one you want. Putting the filter before the projection will allow you to only hydrate one UserInfo object.

abatishchev Over a year ago

@Tyson: Thanks! :) And see you around here, on SO.

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