向要序列化的类添加新字段

Question

为了能够序列化和反序列化我这样设计的 XML：

<?xml version="1.0" encoding="utf-8"?>
<DbConnections xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <DbConnectionInfo>
    <ServerName>SQLServer2k8</ServerName>
  </DbConnectionInfo>
  <DbConnectionInfo>
    <ServerName>SQLServer2k8R2</ServerName>
  </DbConnectionInfo>
</DbConnections>

我在下面写了两个这样的类：

public class DbConnectionInfo
{
    public string ServerName { get; set; }
}

和

[Serializable]
[XmlRoot("DbConnections")]
public class DbConnections: List<DbConnectionInfo>
{
  //...
}

现在我想扩展我的 XML 表单并添加一个像这样的字段，但是有没有一种方法可以设计我的类，而我不必在每个 XML 标记中重复它？像这样：

<?xml version="1.0" encoding="utf-8"?>
<DbConnections xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <DbConnectionInfo>
    <ServerName>SQLServer2k8</ServerName>
  </DbConnectionInfo>
  <DbConnectionInfo>
    <ServerName>SQLServer2k8R2</ServerName>
  </DbConnectionInfo>

   <UseWindowsAuthentication>Yes</UseWindowsAuthentication>
</DbConnections>

所以我只是在之前的 XML 中添加了这一行： 但我的问题是我应该如何修改我的类来添加它？它甚至是可能的还是正确的设计？

<UseWindowsAuthentication>Yes</UseWindowsAuthentication>

Answer 1

可能是这样的

[Serializable]
[XmlRoot("DbConnections")]
public class DbConnections
{
   List<DbConnectionInfo> DbConnectionInfos;
   Boolean UseWindowsAuthentication;
}

编辑添加：如果你不想要嵌套元素，那么装饰你的类

public class DbConnections
{
    [XmlElement("DbConnectionInfo")]
    public List<DbConnectionInfo> DbConnectionInfos;
    public Boolean UseWindowsAuthentication;
}

我对此进行了测试，并序列化了以下 xml

XmlSerializer serializer = new XmlSerializer(typeof(DbConnections));
            string xml;
            using (StringWriter textWriter = new StringWriter())
            {
                serializer.Serialize(textWriter, oDbConnections);
                xml = textWriter.ToString();
            }

<?xml version="1.0" encoding="utf-16"?>
<DbConnections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <DbConnectionInfo>
    <ServerName>test</ServerName>
  </DbConnectionInfo>
  <DbConnectionInfo>
    <ServerName>test 2</ServerName>
  </DbConnectionInfo>
  <UseWindowsAuthentication>true</UseWindowsAuthentication>
</DbConnections>

Here is a link to more info on decorating for xml serialization