WCF 依赖注入和抽象工厂

问题描述

我有这个 wcf 方法

I have this wcf method

Profile GetProfileInfo(string profileType, string profileName)

和业务规则:

如果 profileType 是从数据库中读取的A".

if profileType is "A" read from database.

如果 profileType 是从 xml 文件中读取的B".

if profileType is "B" read from xml file.

问题是:如何使用依赖注入容器来实现?

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

推荐答案

让我们首先假设您有一个 IProfileRepository，如下所示:

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

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

以及两个实现:DatabaseProfileRepository 和 XmlProfileRepository.问题是您想根据 profileType 的值选择正确的.

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.

你可以通过引入这个抽象工厂来做到这一点:

You can do this by introducing this Abstract Factory:

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

假设 IProfileRepositoryFactory 已经被注入到服务实现中，你现在可以像这样实现 GetProfileInfo 方法:

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);
}

IProfileRepositoryFactory 的具体实现可能如下所示:

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...
    }
}

现在您只需要选择您选择的 DI Container 来为您连接所有...

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

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