使用 IXmlSerialized 类表示 XML 配置文件
我正在用 C# 编写并尝试通过 IXmlSerialized 类表示 XML 配置文件。不过,我不确定如何表示配置文件中的嵌套元素,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>
有一个名为 LogLevel
的枚举,它表示 logLevel
的所有可能值代码>logLevel标签。 credentials
中的标签应全部以字符串形式出现。在我的名为 DLLConfigFile
的类中,我有以下内容:
[XmlElement(ElementName="logLevel", DataType="LogLevel")]
public LogLevel LogLevel;
但是,这不会起作用,因为
不在 XML 的根节点内文件中,它是
更深的一个节点。我该怎么做呢?
至于
节点,我的猜测是我需要第二个类,例如 CredentialsSection
,并具有如下属性:
[XmlElement(ElementName="credentials", DataType="CredentialsSection")]
public CredentialsSection[] AllCredentials;
编辑: 好吧,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
。这些类如下所示:
[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;
}
I'm writing in C# and trying to represent an XML config file through an IXmlSerializable
class. I'm unsure how to represent the nested elements in my config file, though, such as 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>
There is an enum called LogLevel
that represents all the possible values for the logLevel
tag. The tags within credentials
should all come out as strings. In my class, called DLLConfigFile
, I had the following:
[XmlElement(ElementName="logLevel", DataType="LogLevel")]
public LogLevel LogLevel;
However, this isn't going to work because <logLevel>
isn't within the root node of the XML file, it's one node deeper in <logging>
. How do I go about doing this?
As for the <credentials>
nodes, my guess is I will need a second class, say CredentialsSection
, and have a property such as the following:
[XmlElement(ElementName="credentials", DataType="CredentialsSection")]
public CredentialsSection[] AllCredentials;
Edit: okay, I tried Robert Love's suggestion and created a LoggingSection
class. However, my test fails:
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);
}
}
The config file I'm testing with definitely has <logging>
. Here's what the classes look like:
[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;
}
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创建一个具有单个属性
LogLevel
的子类,然后在新类型的基类上创建一个日志记录属性。Create a subclass that has a single property
LogLevel
and then create a logging property on your base class that is of the the new type.