Question

我正在尝试从在线购物车中获取包含多个订单的XML文件，解析它并使用C＃和Visual Studio 2008将每个订单的值输出为其自己的文本文件（而不是XML）。我尝试过各种各样的此时的方法，但没有运气。我最后一次尝试包括一个绑定到XMLNodeList的foreach语句，并尝试使用XMLReader将每个元素值写入字符串，为名称为“Order”的每个节点执行我的翻译。 foreach似乎是不适用于当前配置的东西。

有更好的方法可以做到这一点还是我需要继续使用foreach？所有的想法都非常感谢。

 class Class1
  {
     public static void Main()
      {

        StringBuilder orderid = new StringBuilder();
        StringBuilder ordernumber = new StringBuilder();
        StringBuilder name = new StringBuilder();
        StringBuilder staddress = new StringBuilder();
        StringBuilder city = new StringBuilder();
        StringBuilder state = new StringBuilder();
        StringBuilder zip = new StringBuilder();
        StringBuilder country = new StringBuilder();
        StringBuilder email = new StringBuilder();
        StringBuilder partnumber = new StringBuilder();
        StringBuilder quantity = new StringBuilder();

            XmlDocument doc = new XmlDocument();
            doc.Load(@"C:\onlinesales\neworders.xml");
            XmlNode root = doc.DocumentElement;

            XmlNodeList nodeList = root.SelectNodes("Order");
            foreach (XmlNode order in nodeList)
            {

                using (XmlReader reader = XmlReader.Create("Order"))
                {
                    reader.ReadToFollowing("OrderNumber");
                    ordernumber.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("OrderGUID");
                    orderid.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("FirstName");
                    name.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("Email");
                    email.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("BillingAddress1");
                    staddress.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("BillingCity");
                    city.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("BillingState");
                    state.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("BillingZip");
                    zip.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("BillingCountry");
                    country.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("Quantity");
                    quantity.Append(reader.ReadElementContentAsString());

                    reader.ReadToFollowing("OrderedProductManufacturerPartNumber");
                    partnumber.Append(reader.ReadElementContentAsString());
                }

            using (StreamWriter fileout =
                new StreamWriter("W:" + DateTime.Now.ToString("yyyyy-MM-dd_hh-mm-ss-ff") + ".txt", false, Encoding.ASCII))
            {
                fileout.WriteLine("ISA*00*          *00*          *ZZ*daisywebstore  *12*5016361200     *" + DateTime.Now.ToString("yyMMdd") + "*1559*U*00400*000001649*0*P>~");
                fileout.WriteLine("GS*PO*daisywebstore*5016361200*" + DateTime.Now.ToString("yyyyMMdd") + "*" + DateTime.Now.ToString("HHmm") + "*1649*X*004010~");
                fileout.WriteLine("ST*850*13~");
                fileout.WriteLine("BEG*00*SA*08272226001*" + DateTime.Now.ToString("yyyyMMdd") + "~");
                fileout.WriteLine("REF*DP*089~");
                fileout.WriteLine("DTM*002*20120104~");
                fileout.WriteLine("N1*ST*" + name + "~");
                fileout.WriteLine("N3*" + staddress + "~");
                fileout.WriteLine("N4*" + city + "*" + state + "*" + zip + "~");
                fileout.WriteLine("N1*RE**92*00103653341~");
                fileout.WriteLine("PO1*1*6*EA*33.28*TE*IN*985880-542~");
                fileout.WriteLine("PID*F*****CO2 BB PISTOL     $ 5693~");
                fileout.WriteLine("PO4*3*1*EA~");
                fileout.WriteLine("CT*1~");
                fileout.WriteLine("AMT*1*199.68~");
                fileout.WriteLine("SE*16*13~");
            }
                    }
                //File.Delete(@"C:\onlinesales\neworders.xml");
}
}

}

Answer 1

你可以让这个变得非常简单。面向对象编程是可行的方法。

所以说你创建一个带有XElement的Order类。我会为你写几行。

public class Order
{
    XElement self;
    public Order(XElement order)
    {
        self = order;
    }

    public XElement Element { get { return self; } }

    public string OrderNumber 
    { 
        // if your xml looks like <Order OrderNumber="somenumber" />
        get { return (string)(self.Attribute("OrderNumber") ?? (object)"some default value/null"); } 
        // but if it looks like: <Order><OrderNumber>somenumber</OrderNumber></Order>
        // get { return (string)(self.Element("OrderNumber") ?? (object)"some default value/null"); }
    }
}

您必须自己填写订单的其余部分。对于每个Order值，创建一个类似我上面的OrderNumber的属性。拥有每个Order值的属性使得访问数据变得非常简单。

因此，对于您的主要代码，您需要：

XElement file = XElement.Load(@"C:\onlinesales\neworders.xml");
Order[] orders = file.Elements("Order").Select(e => new Order(e)).ToArray();

现在您已将所有订单作为单个订单对象，请在输出到文件时从属性列表中读取数据。现在不需要将值存储在StringBuilder中，因为值在Order对象中。

foreach(Order order in orders)
{
   // write order.OrderNumber  etc. / do whatever you want with the orders.
}

Answer 2

查克有一个很好的方法。有时，您不希望保留对要加载的模型对象中的基础xml数据结构的引用。在这种情况下，我经常使用这样的模式：

public interface IXmlReadable
{
    void Clear();
    void Read(XPathNavigator xmlNav);
}

public class ModelBase : IXmlReadable
{
    public void Clear()
    {
        DoClear();
    }

    public void Read(XPathNavigator xmlNav)
    {
        DoRead(xmlNav);
    }


    protected virtual void DoClear()
    {
        throw new NotImplementedException();
    }

    protected virtual void DoRead(XPathNavigator xmlNav)
    {
        throw new NotImplementedException();
    }
}

可以重载阅读以接受XmlDocument，XmlNode，XElement等。

现在您可以实施特定的模型。

public sealed class Order : ModelBase
{
    public Order() { }

    public string OrderNumber { get; private set; }

    protected override void DoClear()
    {
        OrderNumber = string.Empty;
    }

    protected override void DoRead(XPathNavigator xmlNav)
    {
        DoClear();

        XPathNavigator node;

        node = xmlNav.SelectSingleNode("OrderNumber");

        if (node != null)
            OrderNumber = node.InnerXml;

        // implement other properties here
    }

}

使用XPathDocument和XPathNavigator方法，您可以执行以下操作：

XPathDocument xml = new XPathDocument(@"C:\onlinesales\neworders.xml");

xmlNav = xml.CreateNavigator();

XPathNodeIterator iterator = xmlNav.Select("Order");

while (iterator.MoveNext())
{
    Order order = new Order();
    order.Read(iterator.Current);

    // do something with the Order - add to list or process
}

如何一次操作一个父元素的XML文档？

2 个答案: