揭开.NET 2.0配置隐藏的秘密
将这个元素加到我们之前创建的ExampleSection中，就像定义一个新属性一样简单。下面展示了添加一个嵌套元素的必要代码：
代码 public class ExampleSection: ConfigurationSection
{
#region Constructors
///
/// Predefines the valid properties and prepares
/// the property collection.
///
static ExampleSection()
{
// Create other properties...
s_propElement = new ConfigurationProperty(
"nestedElement",
typeof(NestedElement),
null,
ConfigurationPropertyOptions.IsRequired
);
s_properties = new ConfigurationPropertyCollection();
// Add other properties...
s_properties.Add(s_propElement);
}
#endregion
#region Static Fields
private static ConfigurationProperty s_propElement;
// Other static fields...
#endregion
#region Properties
// ...
///
/// Gets the NestedElement element.
///
[ConfigurationProperty("nestedElement")]
public NestedElement Nested
{
get { return (NestedElement)base[s_propElement]; }
}
// ...
#endregion
}
{
#region Constructors
///
/// Predefines the valid properties and prepares
/// the property collection.
///
static ExampleSection()
{
// Create other properties...
s_propElement = new ConfigurationProperty(
"nestedElement",
typeof(NestedElement),
null,
ConfigurationPropertyOptions.IsRequired
);
s_properties = new ConfigurationPropertyCollection();
// Add other properties...
s_properties.Add(s_propElement);
}
#endregion
#region Static Fields
private static ConfigurationProperty s_propElement;
// Other static fields...
#endregion
#region Properties
// ...
///
/// Gets the NestedElement element.
///
[ConfigurationProperty("nestedElement")]
public NestedElement Nested
{
get { return (NestedElement)base[s_propElement]; }
}
// ...
#endregion
}
最后，在我们的XML配置文件中使用这个元素只需要简单地在标记中添加标记。值得注意的是，只能有一个nestedElement实例在example中。这种方式创建的嵌套元素，不允许有类似命名的元素集合。它允许一个特定元素的单个实例，在自定义节的一个特定的嵌套深度。下一节将讲在一个配置节中定义元素集合。完整的App.config文件应该像下面这样：
<configuration>
<configSections>
<section name="example" type="Examples.Configuration.ExampleSection,
Examples.Configuration" />
</configSections>
<example
stringValue="A sample string value."
boolValue="true"
timeSpanValue="5:00:00"
>
<nestedElement
dateTimeValue="10/16/2006"
integerValue="1"
/>
</example>
</configuration>
<configSections>
<section name="example" type="Examples.Configuration.ExampleSection,
Examples.Configuration" />
</configSections>
<example
stringValue="A sample string value."
boolValue="true"
timeSpanValue="5:00:00"
>
<nestedElement
dateTimeValue="10/16/2006"
integerValue="1"
/>
</example>
</configuration>
使用新的套元素又是非常的简单，因为Nested属性（property）将暴露给我们的前面例子中使用的节变量：
private string m_string;
private bool m_bool;
private TimeSpan m_timespan;
private DateTime m_datetime;
private int m_int;
void GetExampleSettings()
{
ExampleSection section = ConfigurationManager.GetSection("example")
as ExampleSection;
if (section != null)
{
m_string = section.StringValue;
m_bool = section.BooleanValue;
m_timespan = section.TimeSpanValue;
m_datetime = section.Nested.DateTimeValue;
m_int = section.Nested.IntegerValue;
}
}
private bool m_bool;
private TimeSpan m_timespan;
private DateTime m_datetime;
private int m_int;
void GetExampleSettings()
{
ExampleSection section = ConfigurationManager.GetSection("example")
as ExampleSection;
if (section != null)
{
m_string = section.StringValue;
m_bool = section.BooleanValue;
m_timespan = section.TimeSpanValue;
m_datetime = section.Nested.DateTimeValue;
m_int = section.Nested.IntegerValue;
}
}
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