由于本人不擅长写作,所以文字都很简单,各位还是主要看代码及DEMO吧。
首先先看一下以下代码:
public interface ILogger
{
void Write();
}
public class FlatFileLogger : ILogger
{
private Message _message;
public FlatFileLogger(Message message)
{
_message = message;
}
public void Write()
{
Console.WriteLine(String.Format("Message:{0}", _message));
Console.WriteLine("Target:FlatFile");
}
}
public class Message
{
private string _message;
private Message(string message)
{
_message = message;
}
public override string ToString()
{
return _message.ToString();
}
public static Message CreateMessage(string message)
{
return new Message(message);
}
}
class Program
{
static void Main(string[] args)
{
IUnityContainer container = new UnityContainer();
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
section.Containers["containerOne"].Configure(container);
ILogger log = container.Resolve<ILogger>();
log.Write();
Console.ReadLine();
}
}
{
void Write();
}
public class FlatFileLogger : ILogger
{
private Message _message;
public FlatFileLogger(Message message)
{
_message = message;
}
public void Write()
{
Console.WriteLine(String.Format("Message:{0}", _message));
Console.WriteLine("Target:FlatFile");
}
}
public class Message
{
private string _message;
private Message(string message)
{
_message = message;
}
public override string ToString()
{
return _message.ToString();
}
public static Message CreateMessage(string message)
{
return new Message(message);
}
}
class Program
{
static void Main(string[] args)
{
IUnityContainer container = new UnityContainer();
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
section.Containers["containerOne"].Configure(container);
ILogger log = container.Resolve<ILogger>();
log.Write();
Console.ReadLine();
}
}
配置文件:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,
Microsoft.Practices.Unity.Configuration, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</configSections>
<unity>
<typeAliases>
<typeAlias alias="string" type="System.String, mscorlib" />
<!-- Lifetime manager types -->
<typeAlias alias="singleton"
type="Microsoft.Practices.Unity.ContainerControlledLifetimeManager,
Microsoft.Practices.Unity" />
<typeAlias alias="external"
type="Microsoft.Practices.Unity.ExternallyControlledLifetimeManager,
Microsoft.Practices.Unity" />
<!-- User-defined type aliases -->
<typeAlias alias="ILogger" type="UnityDemo.ILogger, UnityDemo" />
<typeAlias alias="FlatFileLogger" type="UnityDemo.FlatFileLogger, UnityDemo" />
<typeAlias alias="Message" type="UnityDemo.Message, UnityDemo" />
</typeAliases>
<containers>
<container name="containerOne">
<types>
<type type="ILogger" mapTo="FlatFileLogger"/>
</types>
</container>
</containers>
</unity>
</configuration>
<configuration>
<configSections>
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,
Microsoft.Practices.Unity.Configuration, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</configSections>
<unity>
<typeAliases>
<typeAlias alias="string" type="System.String, mscorlib" />
<!-- Lifetime manager types -->
<typeAlias alias="singleton"
type="Microsoft.Practices.Unity.ContainerControlledLifetimeManager,
Microsoft.Practices.Unity" />
<typeAlias alias="external"
type="Microsoft.Practices.Unity.ExternallyControlledLifetimeManager,
Microsoft.Practices.Unity" />
<!-- User-defined type aliases -->
<typeAlias alias="ILogger" type="UnityDemo.ILogger, UnityDemo" />
<typeAlias alias="FlatFileLogger" type="UnityDemo.FlatFileLogger, UnityDemo" />
<typeAlias alias="Message" type="UnityDemo.Message, UnityDemo" />
</typeAliases>
<containers>
<container name="containerOne">
<types>
<type type="ILogger" mapTo="FlatFileLogger"/>
</types>
</container>
</containers>
</unity>
</configuration>
一运行程序就报错,那是因为Message类的构造函数是私有的,Unity无法自动装配。
本来父对象的构造函数如果需要指定具体值,可以通过修改配置文件来达到目的,配置修改如下:
<type type="ILogger" mapTo="FlatFileLogger">
<typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement,
Microsoft.Practices.Unity.Configuration">
<constructor>
<param name="message" parameterType="Message">
<value value="Some Value"></value>
</param>
</constructor>
</typeConfig>
</type>
<typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement,
Microsoft.Practices.Unity.Configuration">
<constructor>
<param name="message" parameterType="Message">
<value value="Some Value"></value>
</param>
</constructor>
</typeConfig>
</type>
但现在还有一个问题,就是由于参数message的类型是自定义类型,不是像string, int等系统类型, 按以上配置是无法把一个Message的实例传给FlatFileLogger的构造函数的。这时就需要用到typeConverter,把value中 的值转换成一个Message的实例。
LoggerConverter:
public class LoggerConverter : TypeConverter
{
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvertFrom(context, sourceType);
}
public override object ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, object value)
{
if (value is string)
{
return Message.CreateMessage(value.ToString());
}
return base.ConvertFrom(context, culture, value);
}
}
{
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvertFrom(context, sourceType);
}
public override object ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, object value)
{
if (value is string)
{
return Message.CreateMessage(value.ToString());
}
return base.ConvertFrom(context, culture, value);
}
}
修改后最终的配置文件:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,
Microsoft.Practices.Unity.Configuration, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</configSections>
<unity>
<typeAliases>
<typeAlias alias="string" type="System.String, mscorlib" />
<!-- Lifetime manager types -->
<typeAlias alias="singleton"
type="Microsoft.Practices.Unity.ContainerControlledLifetimeManager,
Microsoft.Practices.Unity" />
<typeAlias alias="external"
type="Microsoft.Practices.Unity.ExternallyControlledLifetimeManager,
Microsoft.Practices.Unity" />
<!-- User-defined type aliases -->
<typeAlias alias="ILogger" type="UnityDemo.ILogger, UnityDemo" />
<typeAlias alias="FlatFileLogger" type="UnityDemo.FlatFileLogger, UnityDemo" />
<typeAlias alias="LoggerConverter" type="UnityDemo.LoggerConverter, UnityDemo" />
<typeAlias alias="Message" type="UnityDemo.Message, UnityDemo" />
</typeAliases>
<containers>
<container name="containerOne">
<types>
<type type="ILogger" mapTo="FlatFileLogger" name="FlatFileLogger" />
<type type="ILogger" mapTo="DatabaseLogger" name="DatabaseLogger"/>
<type type="ILogger" mapTo="FlatFileLogger">
<typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement,
Microsoft.Practices.Unity.Configuration">
<constructor>
<param name="message" parameterType="Message">
<value value="FlatFileLogger" type="Message" typeConverter="LoggerConverter"></value>
</param>
</constructor>
</typeConfig>
</type>
</types>
</container>
</containers>
</unity>
</configuration>
<configuration>
<configSections>
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,
Microsoft.Practices.Unity.Configuration, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</configSections>
<unity>
<typeAliases>
<typeAlias alias="string" type="System.String, mscorlib" />
<!-- Lifetime manager types -->
<typeAlias alias="singleton"
type="Microsoft.Practices.Unity.ContainerControlledLifetimeManager,
Microsoft.Practices.Unity" />
<typeAlias alias="external"
type="Microsoft.Practices.Unity.ExternallyControlledLifetimeManager,
Microsoft.Practices.Unity" />
<!-- User-defined type aliases -->
<typeAlias alias="ILogger" type="UnityDemo.ILogger, UnityDemo" />
<typeAlias alias="FlatFileLogger" type="UnityDemo.FlatFileLogger, UnityDemo" />
<typeAlias alias="LoggerConverter" type="UnityDemo.LoggerConverter, UnityDemo" />
<typeAlias alias="Message" type="UnityDemo.Message, UnityDemo" />
</typeAliases>
<containers>
<container name="containerOne">
<types>
<type type="ILogger" mapTo="FlatFileLogger" name="FlatFileLogger" />
<type type="ILogger" mapTo="DatabaseLogger" name="DatabaseLogger"/>
<type type="ILogger" mapTo="FlatFileLogger">
<typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement,
Microsoft.Practices.Unity.Configuration">
<constructor>
<param name="message" parameterType="Message">
<value value="FlatFileLogger" type="Message" typeConverter="LoggerConverter"></value>
</param>
</constructor>
</typeConfig>
</type>
</types>
</container>
</containers>
</unity>
</configuration>
经过修改后,程序终于可以正常运行了。
运行结果:
本文 代码