Linq to XML：.Net Windowsフォームアプリ、属性の返り値を返します。

Question

John Smithのように姓と名を含むコレクションを返すクエリを作成したいとします。ここで

は私のXMLファイル「Portfolio.xml」です：

<?xml version="1.0" encoding="utf-8" ?> 
<portfolio> 
    <account> 
    <acct custid="1" fname="Tommy" lname="Hawk" ssn="928-329-1929" dob="4/6/1988"></acct> 
    <deposits depid="1000" depdate="1/2/2011" depamount="1350.53"></deposits> 
    <deposits depid="1003" depdate="2/3/2011" depamount="1377.81"></deposits> 
    <deposits depid="1008" depdate="3/14/2011" depamount="84.00"></deposits> 
    <withdrawals wdid="2001" wddate="1/31/2011" wdamount="80.00"></withdrawals> 
    <withdrawals wdid="2005" wddate="4/8/2011" wdamount="80.00"></withdrawals> 
    <withdrawals wdid="2007" wddate="6/1/2011" wdamount="2600.00"></withdrawals> 
    </account> 
    <account> 
    <acct custid="2" fname="I. P." lname="Nightly" ssn="457-23-4871" dob="6/1/1945"></acct> 
    <deposits depid="1004" depdate="2/8/2011" depamount="741.22"></deposits> 
    <deposits depid="1005" depdate="2/9/2011" depamount="47.00"></deposits> 
    <deposits depid="1009" depdate="3/14/2011" depamount="89.99"></deposits> 
    <withdrawals wdid="2003" wddate="3/1/2011" wdamount="55.00"></withdrawals> 
    <withdrawals wdid="2004" wddate="3/3/2011" wdamount="28.00"></withdrawals> 
    <withdrawals wdid="2006" wddate="4/8/2011" wdamount="450.00"></withdrawals> 
    </account> 
    <account> 
    <acct custid="3" fname="Mary" lname="Echmass" ssn="192-01-2933" dob="8/10/1973"></acct> 
    <deposits depid="1002" depdate="1/15/2011" depamount="841.77"></deposits> 
    <deposits depid="1006" depdate="2/14/2011" depamount="2170.00"></deposits> 
    <deposits depid="1007" depdate="3/10/2011" depamount="21.01"></deposits> 
    <withdrawals wdid="2002" wddate="1/16/2011" wdamount="700.00"></withdrawals> 
    <withdrawals wdid="2008" wddate="6/3/2011" wdamount="24.00"></withdrawals> 
    <withdrawals wdid="2009" wddate="6/30/2100" wdamount="38.46"></withdrawals> 
    </account> 
</portfolio> 

Answer 1

var doc = XDocument.Load("Portfolio.xml"); 
var fullNames = 
    from account in doc.Descendants("account") 
    let acct = account.Element("acct") 
    select String.Join(" ", 
     (string)acct.Attribute("fname"), 
     (string)acct.Attribute("lname"));