LINQ到XML零检查属性 [英] Linq To Xml Null Checking of attributes

问题描述

<books>
   <book name="Christmas Cheer" price="10" />
   <book name="Holiday Season" price="12" />
   <book name="Eggnog Fun" price="5" special="Half Off" />
</books>

我想分析这个使用LINQ和我很好奇别人用什么样的方法来处理特别。我现在的这种工作方式是：

I'd like to parse this using linq and I'm curious what methods other people use to handle special. My current way of working with this is:

var books = from book in booksXml.Descendants("book")
                        let Name = book.Attribute("name") ?? new XAttribute("name", string.Empty)
                        let Price = book.Attribute("price") ?? new XAttribute("price", 0)
                        let Special = book.Attribute("special") ?? new XAttribute("special", string.Empty)
                        select new
                                   {
                                       Name = Name.Value,
                                       Price = Convert.ToInt32(Price.Value),
                                       Special = Special.Value
                                   };

如果有更好的方法来解决这个我不知道。

I am wondering if there are better ways to solve this.

谢谢，

• 贾里德

推荐答案

您可以施放属性到字符串。如果它不存在，你会得到空和随后的代码应该检查空，否则将直接返回值。

You can cast the attribute to a string. If it is absent you will get null and subsequent code should check for null, otherwise it will return the value directly.

试试这个：

var books = from book in booksXml.Descendants("book")
            select new
            {
                Name = (string)book.Attribute("name"),
                Price = (string)book.Attribute("price"),
                Special = (string)book.Attribute("special")
            };

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