Question

我有一个类似于此的数据表。

name, hour, price1, price2, price3, price4, price5
fred, 3, 12.5, 13.5, 14, 15, 16
dave, 6, 8, 12, 18, 20.2, 25
fred, 6, 10, 11, 14, 15, 19.7

此表需要输出到看起来像这样的xml文件。

<timeCost>
  <person name="fred">
    <time hour="5">
      <cost price="12.5" />
      <cost price="13.5" />
      <cost price="14" />
      <cost price="15" />
      <cost price="16" />
    </time>
    <time hour="6">
      <cost price="10" />
      <cost price="11" />
      <cost price="14" />
      <cost price="15" />
      <cost price="19.7" />
    </time>
  </person>
  <person name="dave">
    <time hour="6">
      <cost price="8" />
      <cost price="12" />
      <cost price="18" />
      <cost price="20.2" />
      <cost price="25" />
    </time>
  </person>
</timeCost>

我有一个linq查询来从SQL获取数据。

 // initialize data context
 var people = from p in dc.people orderby p.name, p.hour select p;

但是，我在使用linq（csharp）编写xml时遇到了麻烦。具体来说，问题是我不知道如何处理每个名称节点下的多个时间节点（嵌套循环/集合）。怎么办呢？

如果对任何人都很重要，这是一个sql 08 ent db。

Answer 1

您应该在此人的姓名上创建一个分组，也可以在列表中选择价格。像下面的模型一样应该有效。

class Person
{
    public string Name { get; set; }
    public int Hour { get; set; }
    public decimal Price1 { get; set; }
    public decimal Price2 { get; set; }
    public decimal Price3 { get; set; }
    public decimal Price4 { get; set; }
    public decimal Price5 { get; set; }
}

...

List<Person> people = new List<Person>()
{
    new Person() { Name = "Fred", Hour = 3, Price1 = 12.5m, Price2 = 13.5m, Price3 = 14, Price4 = 15, Price5 = 16 },
    new Person() { Name = "Fred", Hour = 6, Price1 = 10, Price2 = 11, Price3 = 14, Price4 = 15, Price5 = 19.7m },
    new Person() { Name = "Dave", Hour = 6, Price1 = 8, Price2 = 12, Price3 = 18, Price4 = 20.2m, Price5 = 25 }
};

var query = from p in people
            group p by p.Name into pg
            select new
            {
                Name = pg.Key,
                Records = from record in pg
                            select new
                            {
                                Hour = record.Hour,
                                Prices = new List<Decimal>() { record.Price1, record.Price2, record.Price3, record.Price4, record.Price5 }
                            }
            };

XDocument document = new XDocument(new XElement("timeCost",
                                from person in query
                                select new XElement("person", new XAttribute("name", person.Name),
                                    from record in person.Records
                                    select new XElement("time", new XAttribute("hour", record.Hour),
                                        from price in record.Prices
                                        select new XElement("cost", new XAttribute("price", price))))));

XDocument现在看起来像这样

<timeCost>
  <person name="Fred">
    <time hour="3">
      <cost price="12.5" />
      <cost price="13.5" />
      <cost price="14" />
      <cost price="15" />
      <cost price="16" />
    </time>
    <time hour="6">
      <cost price="10" />
      <cost price="11" />
      <cost price="14" />
      <cost price="15" />
      <cost price="19.7" />
    </time>
  </person>
  <person name="Dave">
    <time hour="6">
      <cost price="8" />
      <cost price="12" />
      <cost price="18" />
      <cost price="20.2" />
      <cost price="25" />
    </time>
  </person>
</timeCost>

sql to xml使用linq - 嵌套集合

1 个答案: