Question

如何在Object Array

中填写LINQ Query

这是我的数据模型

public class Test
    {
        public string Link { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public Item[] Items { get; set; }
    }

 public class Item
    {
        public string Title { get; set; }
        public string Link { get; set; }
        public string Guid { get; set; }
        public DateTime PublishDate { get; set; }
        public string Description { get; set; }
    }

这是查询

var data = from feed in feedXml.Descendants("channel")
                        select new Rss
                        {
                            Title = feed.Element("title").Value,
                            Link = feed.Element("link").Value,
                            Description = feed.Element("description").Value,
                            Items = // here i have to fill the array of items
                        };

更新 xml formate

<channel>
  .....  
  <item>.....</item>
  <item>.....</item>
  <item>.....</item>
</channel>
<channel>
  .....  
  <item>.....</item>
  <item>.....</item>
  <item>.....</item>
</channel>
<channel>
  .....  
  <item>.....</item>
  <item>.....</item>
  <item>.....</item>
</channel>

Answer 1

您只需要在查询中进行另一个查询。例如，如果channel元素包含item个元素，那么您可以执行以下操作：

Items = feed.Elements("item")
           .Select(x => new Item { // set property values })
           .ToArray()

更新：您似乎正在阅读RSS文件，因此您的查询应该是这样的：

var data = from feed in feedXml.Descendants("channel")
            select new Rss
            {
                Title = (string) feed.Element("title"),
                Link = (string) feed.Element("link"),
                Description = (string) feed.Element("description"),
                Items = feed.Elements("item")
                    .Select(
                        x =>
                            new Item
                            {
                                Title = (string) x.Element("title"),
                                Link = (string) x.Element("link"),
                                Description = (string) x.Element("description"),
                                Guid = (string) x.Element("guid"),
                                PublishDate = (DateTime) x.Element("pubDate")
                            })
                    .ToArray()

            };

此外，我使用了显式转换，而不是直接尝试访问Value属性以阻止NullReferenceException。

在LINQ Query中填充对象数组

1 个答案: