private static void ResolveOptionElement(XmlReader reader, OptionConfiguration configuration)
{
if (reader == null || reader.NodeType != XmlNodeType.Element || reader.Name != XML_OPTION_ELEMENT)
{
return;
}
if (string.IsNullOrWhiteSpace(reader.GetAttribute("path")))
{
throw new OptionConfigurationException("The 'path' attribute of option element is empty or unspecified.");
}
var section = configuration._sections[reader.GetAttribute(XML_PATH_ATTRIBUTE)];
if (section == null)
{
section = configuration._sections.Add(reader.GetAttribute(XML_PATH_ATTRIBUTE));
}
while (reader.Read() && reader.Depth > 1)
{
if (reader.NodeType != XmlNodeType.Element)
{
continue;
}
var typeName = reader.GetAttribute(reader.Name + ".type");
OptionConfigurationElement element = null;
if (string.IsNullOrWhiteSpace(typeName))
{
element = OptionConfigurationUtility.GetGlobalElement(reader.Name);
if (element == null)
{
throw new OptionConfigurationException(string.Format("The '{0}' is a undeclared option element in the '{1}' file.", reader.Name, configuration._filePath));
}
}
else
{
Type type = Type.GetType(typeName, false, true);
if (!typeof(OptionConfigurationElement).IsAssignableFrom(type))
{
throw new OptionConfigurationException(string.Format("The '{0}' is not a OptionConfigurationElement type, in the '{0}' file.", typeName, configuration._filePath));
}
element = (OptionConfigurationElement)Activator.CreateInstance(type);
}
if (element != null)
{
//保存当前元素的名称
string elementName = reader.Name;
//判断获取的配置项元素是否为配置项集合
var collection = element as OptionConfigurationElementCollection;
if (collection == null)
{
element.DeserializeElement(reader);
}
else
{
int depth = reader.Depth;
//由于在OptionConfigurationSection中不允许存在默认集合，则此处始终应将读取器移动到其下的子元素的XML节点上
while (reader.Read() && reader.Depth > depth)
{
if (reader.NodeType == XmlNodeType.Element)
{
collection.DeserializeElement(reader.ReadSubtree());
}
}
}
//将处理完毕的元素对象加入到当前选项节中
section.Children.Add(elementName, element);
}
}
}
/// <summary>
/// 读取选项配置文件中的XML内容。
/// </summary>
/// <param name="reader">在选项配置文件中进行读取操作的<seealso cref="System.Xml.XmlReader"/>读取器。</param>
protected internal virtual void DeserializeElement(XmlReader reader)
{
if (reader.ReadState == ReadState.Initial)
{
if (!reader.Read())
{
throw new OptionConfigurationException();
}
}
OptionConfigurationProperty property;
if (reader.NodeType == XmlNodeType.Element)
{
var elementName = reader.Name;
for (int i = 0; i < reader.AttributeCount; i++)
{
reader.MoveToAttribute(i);
//XML特性名中间含点的，并且是以表示是以元素名打头的，则表示为系统内置特性因而无需解析处理
if (reader.Name.StartsWith(elementName + "."))
{
continue;
}
//获取当前XML元素特性对应的配置属性定义项
if (this.Properties.TryGetValue(reader.Name, out property))
{
this.SetPropertyValue(property, reader.Value);
}
else
{
//执行处理未知的属性反序列化
if (!this.OnDeserializeUnrecognizedAttribute(reader.Name, reader.Value))
{
throw new OptionConfigurationException(string.Format("The '{0}' option configuration attribute is unrecognized.", reader.Name));
}
}
}
//将当前读取器移到元素上
reader.MoveToElement();
}
//如果当前XML元素是空元素(即其没有子节点的元素)，则返回
if (reader.IsEmptyElement)
{
return;
}
//定义当前读取器的初始深度
int depth = reader.Depth;
//定义当前待解析子元素的当前配置项元素
OptionConfigurationElement element = this;
while (reader.Read() && reader.Depth > depth)
{
if (reader.NodeType != XmlNodeType.Element)
{
continue;
}
if (reader.Depth == depth + 1)
{
element = this;
}
//如果当前配置项元素是配置集合，则约定当前读取器所处的位置应当处于其下的集合元素的XML节点处
if (typeof(OptionConfigurationElementCollection).IsAssignableFrom(element.GetType()))
{
//使用当前配置集合来解析当前读取器所处的XML节点内容
element.DeserializeElement(reader.ReadSubtree());
//忽略后续操作，直接进行后续XML内容处理
continue;
}
//根据当前XML元素名获取对应的配置属性定义项，如果获取失败则获取当前配置项中的默认集合属性定义项
if (!element.Properties.TryGetValue(reader.Name, out property))
{
property = OptionConfigurationUtility.GetDefaultCollectionProperty(element.Properties);
}
//如果对应的配置属性定义项均获取失败则抛出异常
if (property == null)
{
throw new OptionConfigurationException(string.Format("The '{0}' option configuration element is unrecognized.", reader.Name));
}
//获取或创建当前配置属性定义项对应的目标元素对象
element = element.EnsureElementPropertyValue(property);
//判断获取的配置项元素是否为配置项集合
var collection = element as OptionConfigurationElementCollection;
if (collection != null)
{
//如果当前配置项集合不是默认集合(即集合有对应的XML节点)，则将当前读取器移动到其下的子元素的XML节点上
if (!property.IsDefaultCollection)
{
reader.ReadToDescendant(string.IsNullOrWhiteSpace(property.ElementName) ? collection.ElementName : property.ElementName);
}
}
//调用当前配置元素对象的反序列化方法
element.DeserializeElement(reader.ReadSubtree());
}
}