LINQ to XML - 讀取XML文檔

Question

有人可以幫助我如何閱讀下面的XML文檔使用Linq XML？

<?xml version='1.0' encoding='UTF-8' ?> 
<cXML> 
<Request> 
<OrderRequest> 
    <OrderRequestHeader orderID="xy1234" orderDate="2007-01-1T15:5400+10:00" type="new" orderVersion="001"> 
    <Total> 
     <Money currency="NZ">34.06</Money> 
    </Total> 
    <ShipTo> 
     <Address> 
     <Name xml:lang="en">xyz</Name> 
     <PostalAddress name="xyz"> 
      <Street>xyz street</Street> 
      <City>xyz</City>    
     </PostalAddress> 
     </Address> 
    </ShipTo> 
    <BillTo> 
     <Address> 
     <Name xml:lang="en">XYZ</Name> 
     <PostalAddress name="XYZ"> 
      <Street>PO BOX 1234</Street> 
      <City>xyz</City> 
      <State>xyz state</State>    
     </PostalAddress> 
     </Address> 
    </BillTo> 
    <Contact role="xxx" addressID="123456789"> 
     <Name xml:lang="en">XYZ</Name> 
     <Email name="business">XYZ@ms.com.nz</Email> 
     <Phone> 
     <TelephoneNumber> 
      <Number>1234-1234</Number> 
     </TelephoneNumber> 
     </Phone> 
    </Contact> 
    <Contact role="ShipTo"> 
     <Name xml:lang="en">XYZ</Name> 
    </Contact> 
    <Contact role="Supplier"> 
     <Name xml:lang="en">XYZ pty ltd</Name> 
    </Contact> 
    </OrderRequestHeader> 
    <ItemOut quantity="20" lineNumber="1" requestedDeliveryDate="2007-01-01T00:0000+10:00"> 
    <ItemID> 
     <SupplierPartID>12345678</SupplierPartID> 
    </ItemID> 
    <ItemDetail> 
     <UnitPrice> 
     <Money currency="NZ">32</Money> 
     </UnitPrice> 
     <Description xml:lang="en">abc description</Description> 
     <UnitOfMeasure>CU</UnitOfMeasure> 
     <Classification domain="N/A"/> 
     <ManufacturerPartID>12345678</ManufacturerPartID> 
     <Extrinsic name="StockCode">12345</Extrinsic> 
     <Extrinsic name="Quantity">1</Extrinsic>   
    </ItemDetail> 
    </ItemOut> 
    <ItemOut quantity="10" lineNumber="2" requestedDeliveryDate="2007-01-01T00:0000+10:00"> 
    <ItemID> 
     <SupplierPartID>12345678</SupplierPartID> 
    </ItemID> 
    <ItemDetail> 
     <UnitPrice> 
     <Money currency="NZ">32</Money> 
     </UnitPrice> 
     <Description xml:lang="en">abc description</Description> 
     <UnitOfMeasure>CU</UnitOfMeasure> 
     <Classification domain="N/A"/> 
     <ManufacturerPartID>12345678</ManufacturerPartID> 
     <Extrinsic name="StockCode">23333</Extrinsic> 
     <Extrinsic name="Quantity">1</Extrinsic> 
    </ItemDetail> 
    </ItemOut> 
</OrderRequest> 

我試着用這個代碼，但它給空值或對象引用未設置錯誤：

XDocument xdoc = XDocument.Load(@"C:\PO.xml"); 
var itemOut = (from c in xdoc.Descendants("OrderRequest") 

           select new 
           { 
            SupplierID = c.Element("Money").Value        , 
            Currency = c.Attribute("currency").Value, 
            Money = c.Element("Money").Value, 
            Description = c.Element("Description").Value, 
            ManufacturerPartID = c.Element("ManufacturerPartID").Value, 
            Extrinsic = c.Attribute("name").Value 
           }); 

       foreach (var element in itemOut) 
       { 
        Console.WriteLine(element.SupplierID); 
       } 

       Console.ReadLine(); 

Answer 1

那麼它是不明確或者說你沒有解釋你的數據感興趣的內容。但是您目前選擇「OrderRequest」元素似乎並沒有任何你想的屬性或子元素的一個訪問讓我懷疑這樣做

var itemOut = from c in xdoc.Descendants("ItemOut") 

           select new 
           { 
            SupplierID = c.Element("ItemID").Element("SupplierPartID").Value        , 
            Currency = c.Element("ItemDetail").Element("UnitPrice").Element("Money").Attribute("currency").Value, 
            Money = (double)c.Element("ItemDetail").Element("UnitPrice").Element("Money"), 
            Description = c.Element("ItemDetail").Element("Description").Value, 
            ManufacturerPartID = c.Element("ItemDetail").Element("ManufacturerPartID").Value 
           }; 

接近世界衛生大會你想實現。我無法確定你想要的「外在」元素，所以我把它留下了。