基于InnerXML的XDocument元素排序

Question

我有一个类似下面的XML文档：

<document>
    <post>
      <author>Bill Smith</author>
      <subject>Test Article</subject>
      <dates>
          <uploaded>some date</uploaded>
          <published>some date</published>
      </dates>
      <price>
           <provider>Amazon</provider>
           <cost>1540</cost>
      </price>
      <price>
           <provider>WH Smith</provider>
           <cost>2640</cost>
      </price>
    </post>
    <post>
      <author>Bill Smith</author>
      <subject>Test Article</subject>
      <dates>
          <uploaded>some date</uploaded>
          <published>some date</published>
      </dates>
      <price>
           <provider>Amazon</provider>
           <cost>1540</cost>
      </price>
      <price>
           <provider>WH Smith</provider>
           <cost>2640</cost>
      </price>
    </post> 
</document>

我使用的是带有.NET 4.5的XDocument。我知道还有其他方法可以用来排序。

我有它的工作正常拉每个帖子，并把它放入一个帖子模型。然而，我想排序价格元素，并挑选出最低的价格(以及供应商)，以便我可以将其插入到我的EF数据库中。

任何帮助都会非常感谢，我完全不知道从哪里开始做这个。

Answer 1

你可以试一试：

        XDocument doc = XDocument.Load(@"Data.xml");
        var elements = doc.Root
            .Elements("post")
            .Select(post => new
            {
                Author = post.Element("author").Value,
                Subject = post.Element("subject").Value,
                Uploaded = Convert.ToDateTime(post.Element("dates").Element("uploaded").Value),
                Published = Convert.ToDateTime(post.Element("dates").Element("published").Value),
                Price = new
                {
                    P = post
                        .Elements("price")
                        .OrderByDescending(price => Convert.ToDecimal(price.Element("cost").Value))
                        .Select(o => new
                        {
                            Provider = o.Element("provider").Value,
                            Cost = Convert.ToDecimal(o.Element("cost").Value)
                        })
                        .First()
                }
            });

        var p = elements.First();

Answer 2

基于您提供的代码，请参见，如果此方法有效：

var xmlDocumentElement = xDocument.Load("xmlData.xml").Root;

var posts = xmlDocumentElement.Elements("post").Select(post => new 
    {
    Author = post.Element("author").Value.ToString(),
    Subject = post.Element("subject").Value.ToString(),
    AvailableDate = DateTime.Parse(post.Descendants("dates").FirstOrDefault().Value),
    Price = GetPriceFromPriceXElement(post.Elements("price").Aggregate((prev, next) => 
            Decimal.Parse(prev.Element("cost").Value.ToString()) <= Decimal.Parse(next.Element("cost").Value.ToString()) ? prev : next ))
    }
    );

public Price GetPriceFromPriceXElement(XElement price)
{
   return new Price
    { 
        Provider = price.Element("provider").Value.ToString(),
        Cost = price.Element("cost").Value.ToString()
    };
}

Answer 3

尝尝这个。应该能行得通。一旦你有了数据，你就可以对其进行处理。请照顾NULL等。这只是围绕你的需求的基本想法。

 XDocument doc = XDocument.Load(@"XMLFile1.xml");
        var posts = doc.Root.Elements("post")
                   .Select(p =>
                            new
                            {
                               Author = p.Element("author").Value,
                               Price = p.Elements("price").OrderBy(a => decimal.Parse(a.Element("cost").Value)).First()
                     });

        foreach(var a in posts)
        {
            Console.WriteLine(a.Author + " " + a.Price);
        }