C#的XML文件格式

C#中的XML文件格式与标准的XML文件格式相同，可以使用XmlTextWriter或XmlDocument类来创建和操作XML文件。以下是一个示例XML文件格式：

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <book id="bk101">
    <author>Gambardella, Matthew</author>
    <title>XML Developer's Guide</title>
    <genre>Computer</genre>
    <price>44.95</price>
    <publish_date>2000-10-01</publish_date>
    <description>An in-depth look at creating applications 
      with XML.</description>
  </book>
  <book id="bk102">
    <author>Ralls, Kim</author>
    <title>Midnight Rain</title>
    <genre>Fantasy</genre>
    <price>5.95</price>
    <publish_date>2000-12-16</publish_date>
    <description>A former architect battles corporate zombies, 
      an evil sorceress, and her own childhood to become queen 
      of the world.</description>
  </book>
  <book id="bk103">
    <author>Corets, Eva</author>
    <title>Maeve Ascendant</title>
    <genre>Fantasy</genre>
    <price>5.95</price>
    <publish_date>2000-11-17</publish_date>
    <description>After the collapse of a nanotechnology 
      society in England, the young survivors lay the 
      foundation for a new society.</description>
  </book>
</catalog>

在此示例中，`<?xml version="1.0" encoding="UTF-8"?>`声明了XML版本和编码格式。`<catalog>`是根元素，包含了三个`<book>`元素。每个`<book>`元素都有一个唯一的id属性，以及作者、标题、类型、价格、出版日期和描述等子元素。