專心寫好程式

範例檔：https://msdn.microsoft.com/zh-tw/library/bb669158.aspx
教學說明：https://msdn.microsoft.com/zh-tw/library/bb387041.aspx

static void ReadFromXML()
{
    try
    {
        XElement root = XElement.Load("../../App_Data/XML01.xml");
        XNamespace aw = "http://www.adventure-works.com";

        Console.WriteLine(root.Attribute(aw + "PurchaseOrderNumber").Value);
        Console.WriteLine(root.Attribute(aw + "OrderDate").Value);

        IEnumerable<XElement> address =
            from el in root.Elements(aw + "Address")
            where (string)el.Attribute(aw + "Type") == "Billing"
            select el;

        foreach (XElement el in address)
            Console.WriteLine(el);

        foreach (XElement el in address)
            Console.WriteLine(el.Element(aw+"Zip").Value);
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
    }
}

輸出結果：

99503
1999-10-20
<aw:Address aw:Type="Billing" xmlns:aw="http://www.adventure-works.com">
  <aw:Name>Tai Yee</aw:Name>
  <aw:Street>8 Oak Avenue</aw:Street>
  <aw:City>Old Town</aw:City>
  <aw:State>PA</aw:State>
  <aw:Zip>95819</aw:Zip>
  <aw:Country>USA</aw:Country>
</aw:Address>
95819