在Linq中查找XML中的元素

时间:2013-06-11 18:35:15

标签: c# linq-to-xml

所以我生成了这个XML文件,它看起来像这样:

<?xml version="1.0" encoding="utf-8"?>
<Members xmlns="urn:lst-emp:emp">
  <Member xmlns="">
    <!--Info for Member TESTER-->
    <AccountName>Test Name</AccountName>
    <AccountNumber>Test Number</AccountNumber>
    <AccountBalance>Test Balance</AccountBalance>
  </Member>
  <Member xmlns="">
    <!--Info for Member Jeff Reed-->
    <AccountName>Jeff Reed</AccountName>
    <AccountNumber>5929</AccountNumber>
    <AccountBalance>9223.01</AccountBalance>
  </Member>
</Members>

我可以使用下面的方法在整个XML中搜索AccountName,但在它作为匹配后,我需要一种方法来获得相应的xElements AccountNumber以验证它的PIN(帐号)是否等于我的密码文本框。

internal static bool userExists(String validationName)
    {
        bool foundUser = false;
        //check for a name
        XElement xelement = XElement.Load(Application.LocalUserAppDataPath + "\\members.xml");
        IEnumerable<XElement> members = xelement.Elements();
        foreach (var member in members)
        {
            if (member.Element("AccountName").Value == validationName)
            {
                //MessageBox.Show("It's a match.");
                foundUser = true;
                return foundUser;
            }
            else
            {
                //MessageBox.Show("No match found.");
            }
        }
        return foundUser;
    }

我该怎么做呢?我已经考虑过将它变回我的BankMember对象,但我需要一种方法来首先解析匹配用户名中的信息。

        BankMember newMember = new BankMember(txtBxAccountName.Text.ToString(), int.Parse(txtBxAccountNumber.Text), float.Parse(txtBxStartingBalance.Text.TrimStart('$')));

2 个答案:

答案 0 :(得分:0)

以下代码为您提供匹配元素的帐号

members.Where(x=> x.Element("AccountName").Value==validationName).Select(x=> x.Element("AccountNumber").Value).FirstOrDefault();

答案 1 :(得分:0)

父母是关键。像这样:

    internal static XElement FindMember(String validationName)
    {
        XDocument doc = XDocument.Load(Application.LocalUserAppDataPath + "\\members.xml");

        XElement accountNameElement = doc.Root
                                         .Elements("Member")
                                         .Elements("AccountName")
                                         .FirstOrDefault(e => e.Value == validationName);

        if (accountNameElement != default(XElement))
            return accountNameElement.Parent;
        return default(XElement);
    }

这样调用:

        XElement memberElement= FindMember("Test Name");
        if (memberElement== default(XElement))
            Console.WriteLine("Not Found");
        else
        {
            Console.WriteLine("Found {0}, {1}, {2}"
                , memberElement.Element("AccountName").Value
                , memberElement.Element("AccountNumber").Value
                , memberElement.Element("AccountBalance").Value);
        }