帮助我在没有配置文件的情况下统一实现DI [英] Help me to implement DI with unity without config file

问题描述

我熟悉如何与配置文件一起实现Di.所以我在这里发布我的代码，其中已经使用了配置文件.所以任何人只要看看我的代码即可实现相同的功能，而无需配置文件，例如寄存器类型和解析 基于条件的实例.

i am familiar with how to implement Di with unity with config file. so here i am posting my code where config file has been used. so anyone just have a look at my code and implement the same functionality without config file like register type and resolve instance based on condition.

让我们定义一个接口

public interface ILogger
{
     void Write(string message);
}

我们定义了以下三个类.

We have define three classes as follows.

public class FileLogger : ILogger
{
     public void Write(string message)
     {
          //Do somthing
     }
}

public class SQLLogger : ILogger
{
     public void Write(string message)
     {
          //Do somthing
     }
}

public class WindowsEventLogger : ILogger
{
     public void Write(string message)
     {
          //Do somthing
     }
}

需要使用接口在配置文件(即app.config)中注册和映射这些类.

Need to register and map these classes with interface in configuration file (i.e. app.config).

<configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
  </configSections>
  
  <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
    <alias type="UnityTest.ILogger, UnityTest" alias="ILogger" />
    <namespace name="UnityTest"/>
    
    <container>
      <register mapTo="UnityTest.FileLogger, UnityTest" name="MyFileLogger" type="ILogger"/>
      <register mapTo="UnityTest.SQLLogger, UnityTest" name="MySQLLogger" type="ILogger"/>
      <register mapTo="UnityTest.WindowsEventLogger, UnityTest" name="MyWindowsEventLogger" type="ILogger"/>
    </container>
</unity>

注意:名称属性在注册代码中很重要.

Note: name attribute is important in register tag.

最后，我们必须将此映射用于我们的代码中.因此，我们必须知道，哪个国家/地区适合特定国家/地区.

Finally we have to use this map into our code. So, we have to know that for which one is preferable for specific country.

可以使用字典对象来保持此映射，如下所示.

A dictionary object can be use to keep this mapping as follows.

IDictionary<string, string> loggers = new Dictionary<string, string>();
loggers.Add("USA", "MyFileLogger");
loggers.Add("GBR", "MySQLLogger");
loggers.Add("IN", "MyWindowsEventLogger");

 

您可以从数据库，xml或其他来源填充​​它，现在是时候调用Write方法了.

 

You can populate it from database, xml or another source, and now it's time to call the Write method.

IUnityContainer container = new UnityContainer();
container.LoadConfiguration();

ILogger logger = container.Resolve<ILogger>(loggers[objUser.countryCode]);
logger.Write("Hello World");

推荐答案

如果您正在谈论的是依赖注入而不更改配置文件.您可能想使用其他技术.

If you are talking about Dependency Injection without changing config file. You might want to use another technology.

http://fluentnhibernate.codeplex.com/

http://fluentnhibernate.codeplex.com/

chanmm

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