protected internal object this[OptionConfigurationProperty property]
{
get
{
if (property == null)
{
throw new ArgumentNullException("property");
}
object value;
if (_values.TryGetValue(property, out value))
{
return(value);
}
return(property.DefaultValue);
}
set
{
this.SetPropertyValue(property, value);
//激发“PropertyChanged”事件
this.RaisePropertyChanged(property.Name);
}
}
private void SetPropertyValue(OptionConfigurationProperty property, object value)
{
if (property == null)
{
throw new ArgumentNullException("property");
}
if (object.Equals(value, property.DefaultValue))
{
_values.Remove(property);
}
else
{
if (TypeExtension.IsAssignableFrom(property.Type, value.GetType()))
{
_values[property] = value;
}
else
{
if (property.Converter == null)
{
_values[property] = Converter.ConvertValue(value, property.Type, property.DefaultValue);
}
else
{
_values[property] = property.Converter.ConvertFrom(value);
}
}
}
}
private static OptionConfigurationProperty CreateOptionPropertyFromAttribute(PropertyInfo propertyInfo)
{
OptionConfigurationProperty result = null;
var attribute = (OptionConfigurationPropertyAttribute)propertyInfo.GetCustomAttribute(typeof(OptionConfigurationPropertyAttribute));
if (attribute != null)
{
result = new OptionConfigurationProperty(propertyInfo);
}
return(result);
}
private OptionConfigurationElement EnsureElementPropertyValue(OptionConfigurationProperty property)
{
if (property == null)
{
throw new ArgumentNullException("property");
}
object value = null;
lock (_values)
{
_values.TryGetValue(property, out value);
if (value == null)
{
//如果当前配置属性定义项的类型不是一个选项配置元素，则抛出异常。因为所有复合类型必须从选项配置元素继承
if (!TypeExtension.IsAssignableFrom(typeof(OptionConfigurationElement), property.Type))
{
throw new OptionConfigurationException();
}
//根据配置属性定义项的类型创建其对应的目标对象
if (property.Type.IsGenericType() && property.Type.GetGenericTypeDefinition() == typeof(OptionConfigurationElementCollection <>))
{
value = Activator.CreateInstance(property.Type, new object[] { property.ElementName, null });
}
else
{
value = Activator.CreateInstance(property.Type);
}
//设置创建的选项配置元素对象的表示其自身的属性定义项
((OptionConfigurationElement)value)._elementProperty = property;
//将创建的目标对象保存到对应的属性值中
_values[property] = value;
}
}
return((OptionConfigurationElement)value);
}