WCF依赖注入和抽象工厂 [英] WCF Dependency injection and abstract factory

问题描述

我有这个wcf方法

  Profile GetProfileInfo（string profileType，string profileName）
  

和业务规则：

如果profileType是从数据库读取的A。

如果profileType是从xml文件读取的B。

问题是：如何使用一个依赖注入容器？

解决方案

我们首先假设你有一个这样的IProfileRepository：

  public interface IProfileRepository 
 {
 Profile GetProfile（string profileName）; 
} 
  

以及两个实现： DatabaseProfileRepository 和 XmlProfileRepository 。您可以根据profileType的值选择正确的问题。

您可以通过引入此抽象工厂 ：

  public interface IProfileRepositoryFactory 
 {
 IProfileRepository Create（string profileType）; 
} 
  

假设IProfileRepositoryFactory已注入到服务实现中，您现在可以实现GetProfileInfo方法如下：

  public Profile GetProfileInfo（string profileType，string profileName）
 {
 return this.factory.Create（profileType）.GetProfile（PROFILENAME）; 
} 
  

IProfileRepositoryFactory的具体实现可能如下所示：

  public class ProfileRepositoryFactory：IProfileRepositoryFactory 
 {
 private readonly IProfileRepository aRepository; 
私有只读IProfileRepository bRepository; 
 
 public ProfileRepositoryFactory（IProfileRepository aRepository，
 IProfileRepository bRepository）
 {
 if（aRepository == null）
 {
 throw new ArgumentNullException aRepository）; 
} 
 if（bRepository == null）
 {
 throw new ArgumentNullException（bRepository）; 
} 
 
 this.aRepository = aRepository; 
 this.bRepository = bRepository; 
 
 
 public IProfileRepository Create（string profileType）
 {
 if（profileType ==A）
 {
 return this。 aRepository; 
} 
 if（profileType ==B）
 {
 return this.bRepository; 
} 
 
 //等等... 
} 
} 
  

现在，您只需要选择您所选择的DI容器即可连线...

I have this wcf method

Profile GetProfileInfo(string profileType, string profileName)

and a business rule:

if profileType is "A" read from database.

if profileType is "B" read from xml file.

The question is: how to implement it using a dependency injection container?

解决方案

Let's first assume that you have an IProfileRepository something like this:

public interface IProfileRepository
{
     Profile GetProfile(string profileName);
}

as well as two implementations: DatabaseProfileRepository and XmlProfileRepository. The issue is that you would like to pick the correct one based on the value of profileType.

You can do this by introducing this Abstract Factory:

public interface IProfileRepositoryFactory
{
    IProfileRepository Create(string profileType);
}

Assuming that the IProfileRepositoryFactory has been injected into the service implementation, you can now implement the GetProfileInfo method like this:

public Profile GetProfileInfo(string profileType, string profileName)
{
    return this.factory.Create(profileType).GetProfile(profileName);
}

A concrete implementation of IProfileRepositoryFactory might look like this:

public class ProfileRepositoryFactory : IProfileRepositoryFactory
{
    private readonly IProfileRepository aRepository;
    private readonly IProfileRepository bRepository;

    public ProfileRepositoryFactory(IProfileRepository aRepository,
        IProfileRepository bRepository)
    {
        if(aRepository == null)
        {
            throw new ArgumentNullException("aRepository");
        }
        if(bRepository == null)
        {
            throw new ArgumentNullException("bRepository");
        }

        this.aRepository = aRepository;
        this.bRepository = bRepository;
    }

    public IProfileRepository Create(string profileType)
    {
        if(profileType == "A")
        {
            return this.aRepository;
        }
        if(profileType == "B")
        {
            return this.bRepository;
        }

        // and so on...
    }
}

Now you just need to get your DI Container of choice to wire it all up for you...

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