Linq to XML：.Net Windows窗体，XML查询

我正在尝试创建一个包含名字，姓氏，SSN和出生日期的客户记录。当用户从组合框（cboCustomer）中选择一个客户时，它会调用SelectedIndexChanged事件。我想使用选定的索引从我的XML中获取正确的客户记录。Linq to XML：.Net Windows窗体，XML查询

这是我创建的查询，但它是空的。查询下面是我的XML数据源。

private void cboCustomer_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     var doc = XElement.Load("Portfolio.xml"); 
     customerId = cboCustomer.SelectedIndex.ToString(); 
     if (cboCustomer.SelectedIndex != 0) 
     { 
      var custRecord = 
       from account in doc.Descendants("account") 
       let acct = account.Element("acct") 
       where (string)account.Element("custid") == customerId 
       select new 
       {Fname=(string)account.Element("fname"), 
        Lname = (string)account.Element("lname"), 
        Ssn = (string)account.Element("ssn"), 
        Dob = (string)account.Element("dob") 
       }; 
     } 
    }

<?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>

来源

2011-10-25 Susan

我希望你的数据是模拟数据，而不是有效的ssn，名称和dob的真实客户名单 –

这是模拟数据....名称，如查克·瓦格和I. P. Nightly; o）） – Susan

。在你的XML元素没有custid，但你在你的代码寻找它。

你可能想

where acct.Attribute("custid").Value == customerId

而且你需要修改select以类似的方式。

来源

2011-10-25 01:49:51 svick

Linq to XML：.Net Windows窗体，XML查询

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