如何使用SchemaVersion從XML查詢？

Question

我有這個XML檔案

<?xml version="1.0" encoding="us-ascii" ?> 
<LoanSetupFile SchemaVersion="3.0" NumberOfLoans="2" xmlns="https://www.something.com/schemas">
 <Loan ServicerLoanNumber="1"/>
 <Loan ServicerLoanNumber="2"/>
</LoanSetupFile>

我正在嘗試獲取ServicerLoanNumber屬性。 我已經嘗試了很多方法，這可能是我最接近的嘗試，但是仍然返回null

var doc = XDocument.Load("fileName.xml");
XNamespace ns = doc.Root.GetDefaultNamespace(); //This gives me the correct namespace
var loans = from l in doc.Descendants(ns+"Loan") select new { ServicerLoanNumber = l.Attribute("ServicerLoanNumber").Value };

有誰知道這是怎么回事？ 我是否需要包含SchemaVersion？ 如果是這樣，怎么辦？

非常感謝..

Answer 1

我只是在winform中對您的代碼進行了快速測試，效果很好。

        StringBuilder sb = new StringBuilder();
        sb.Append(@"<?xml version=""1.0"" encoding=""us-ascii"" ?>");
        sb.Append(@"<LoanSetupFile SchemaVersion=""3.0"" NumberOfLoans=""2"" xmlns=""https://www.something.com/schemas"">");
        sb.Append(@"<Loan ServicerLoanNumber=""1""/>");
        sb.Append(@"<Loan ServicerLoanNumber=""2""/>");
        sb.Append(@"</LoanSetupFile>");

        var doc = XDocument.Load(new MemoryStream(Encoding.UTF8.GetBytes(sb.ToString() ?? "")));
        XNamespace ns = doc.Root.GetDefaultNamespace(); //This gives me the correct namespace
        var loans = from l in doc.Descendants(ns + "Loan") 
                    select new { ServicerLoanNumber = l.Attribute("ServicerLoanNumber").Value };

        // Temporarily display the values
        foreach (var l in loans)
        {
            MessageBox.Show(l.ServicerLoanNumber);
        }