自定义配置文件读取

　　配置文件用处很多，最开始使用是在数据分页数量当中。其次接触是在NHibernate当中。抽象工厂+配置文件是一个很好的应用。通过接口+配置文件，可以很方便的实现开放封闭原则。

　　配置文件分为：元素，元素集合，节。

　　元素： 

public class PersistenceElement : ConfigurationElement
{
[ConfigurationProperty(ConfigName.PropertyName, IsKey = true , IsRequired = true )]
public string EntityClass
{
get
{
return ( string ) this [ConfigName.PropertyName];
}
set
{
this [ConfigName.PropertyName] = value;
}
}

[ConfigurationProperty(ConfigName.PropertyValue, IsRequired = true )]
public string PersistenceClass
{
get
{
return ( string ) this [ConfigName.PropertyValue];
}
set
{
this [ConfigName.PropertyValue] = value;
}
}
}

 　　元素集合：

public class PersistenceElementCollenction : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new PersistenceElement();
}

protected override object GetElementKey(ConfigurationElement element)
{
return ((PersistenceElement)element).EntityClass;
}

public override ConfigurationElementCollectionType CollectionType
{
get { return ConfigurationElementCollectionType.BasicMap; }
}

protected override string ElementName
{
get { return ConfigName.PersistenceElement; }
}

public PersistenceElement this [ int index]
{
get { return (PersistenceElement) this .BaseGet(index); }
set
{
if ( this .BaseGet(index) != null )
{
this .BaseRemoveAt(index);
}
this .BaseAdd(index, value);
}
}

public new PersistenceElement this [ string interfaceShortTypeName]
{
get { return (PersistenceElement) this .BaseGet(interfaceShortTypeName); }
}

public bool ContainsKey( string keyName)
{
bool result = false ;
object [] keys = this .BaseGetAllKeys();
foreach ( object key in keys)
{
if (( string )key == keyName)
{
result = true ;
break ;

}
}
return result;
}
}

　　节：

public class PersistenceProperty : ConfigurationSection
{
[ConfigurationProperty(ConfigName.PersistenceElementCollection,
IsDefaultCollection = true )]
public PersistenceElementCollenction GetElementCollection
{
get { return (PersistenceElementCollenction) base [ConfigName.PersistenceElementCollection]; }
}
}

　　配置文件的书写方式如下：

<? xml version = " 1.0 " encoding = " utf-8 " ?>
< configuration >
< configSections >
< section name = " PersistenceSection " type = " Configuration.PersistenceProperty, Configuration " />
</ configSections >
< PersistenceSection >
< Persistences >
< Persistence PropertyName = " A1 " PropertyValue = " A1Factory " ></ Persistence >
< Persistence PropertyName = " A2 " PropertyValue = " A2Factory " ></ Persistence >
< Persistence PropertyName = " A3 " PropertyValue = " A3Factory " ></ Persistence >
</ Persistences >
</ PersistenceSection >
</ configuration >

　　总结：通过配置文件我们可以动态的加载应用程序集。从而实现开放封闭原则。

下载源代码:文件下载

转载于:https://www.cnblogs.com/yangboyu/archive/2010/06/20/1761582.html