我正在用 C# 编写并尝试通过一个IXmlSerializable
类来表示 XML 配置文件。不过,我不确定如何在我的配置文件中表示嵌套元素,例如logLevel
:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<logging>
<logLevel>Error</logLevel>
</logging>
<credentials>
<user>user123</user>
<host>localhost</host>
<password>pass123</password>
</credentials>
<credentials>
<user>user456</user>
<host>my.other.domain.com</host>
<password>pass456</password>
</credentials>
</configuration>
有一个枚举LogLevel
,它代表logLevel
标签的所有可能值。里面的标签都credentials
应该以字符串的形式出现。在我的课堂上,称为DLLConfigFile
,我有以下内容:
[XmlElement(ElementName="logLevel", DataType="LogLevel")]
public LogLevel LogLevel;
但是,这是行不通的,因为<logLevel>
它不在 XML 文件的根节点内,而是在<logging>
. 我该怎么做呢?
至于<credentials>
节点,我的猜测是我需要第二个类,比如CredentialsSection
,并且具有如下属性:
[XmlElement(ElementName="credentials", DataType="CredentialsSection")]
public CredentialsSection[] AllCredentials;
编辑: 好的,我尝试了 Robert Love 的建议并创建了一个LoggingSection
类。但是,我的测试失败了:
var xs = new XmlSerializer(typeof(DLLConfigFile));
using (var stream = new FileStream(_configPath, FileMode.Open,
FileAccess.Read, FileShare.Read))
{
using (var streamReader = new StreamReader(stream))
{
XmlReader reader = new XmlTextReader(streamReader);
var file = (DLLConfigFile)xs.Deserialize(reader);
Assert.IsNotNull(file);
LoggingSection logging = file.Logging;
Assert.IsNotNull(logging); // fails here
LogLevel logLevel = logging.LogLevel;
Assert.IsNotNull(logLevel);
Assert.AreEqual(EXPECTED_LOG_LEVEL, logLevel);
}
}
我正在测试的配置文件肯定有<logging>
. 下面是这些类的样子:
[Serializable]
[XmlRoot("logging")]
public class LoggingSection : IXmlSerializable
{
public XmlSchema GetSchema()
{
return null;
}
[XmlElement(ElementName="logLevel", DataType="LogLevel")]
public LogLevel LogLevel;
public void ReadXml(XmlReader reader)
{
LogLevel = (LogLevel)Enum.Parse(typeof(LogLevel),
reader.ReadString());
}
public void WriteXml(XmlWriter writer)
{
writer.WriteString(Enum.GetName(typeof(LogLevel), LogLevel));
}
}
[Serializable]
[XmlRoot("configuration")]
public class DLLConfigFile : IXmlSerializable
{
[XmlElement(ElementName="logging", DataType="LoggingSection")]
public LoggingSection Logging;
}