通用工作单元 [英] Generic Unit Of Work

问题描述

我已经实现了EntityFramework模式以及存储库和工作单元.该实现类似于代码项目存储库示例，但是我需要对工作单元进行增强.

I have implemented EntityFramework pattern along with Repository and Unit Of Work. The implementation is similar to Code Project Repository Example, however I need an enhancement for the Unit Of Work.

工作单位

public class GenericUnitOfWork : IDisposable
{
    // Initialization code

    public Dictionary<Type, object> repositories = new Dictionary<Type, object>();

    public IRepository<T> Repository<T>() where T : class
    {
        if (repositories.Keys.Contains(typeof(T)) == true)
        {
            return repositories[typeof(T)] as IRepository<T>
        }
        IRepository<T> repo = new Repository<T>(entities);
        repositories.Add(typeof(T), repo);
        return repo;
    }

    // other methods
}

上面的UoW是一个安静的概括，它始终以父级Repository类为目标.我有另一个实体，例如学生，它有自己的存储库，该存储库扩展了Repository类.学生特定的存储库具有方法"GetStudentMarks()".现在，我无法使用常规的Unit of Work类，因为它始终指向父存储库.

The above UoW is quiet generalized and it targets the parent Repository class always. I have another entity, for example student, which has its own repository extending the Repository class. The student specific repository has a method "GetStudentMarks()". Now I cannot use the general Unit Of Work class since it always points to the parent Repository.

如何实施通用工作单位来处理此类情况?预先感谢.

How to implement a general Unit Of Work to handle such situations? Thanks in advance.

推荐答案

您可以使类 GenericUnitOfWork 泛型，并指定实体和存储库类型:

You can make the class GenericUnitOfWork generics, specifying the entity and repository type:

public class GenericUnitOfWork<TRepo, TEntity> : IDisposable
    where TRepo : Repository<TEntity>
{
    // Initialization code

    public Dictionary<Type, TRepo> repositories = new Dictionary<Type, TRepo>();

    public TRepo Repository()
    {
        if (repositories.Keys.Contains(typeof(TEntity)) == true)
        {
            return repositories[typeof(TEntity)];
        }
        TRepo repo = (TRepo)Activator.CreateInstance(
            typeof(TRepo),
            new object[] { /*put there parameters to pass*/ });
        repositories.Add(typeof(TEntity), repo);
        return repo;
    }

    // other methods
}

类似的事情应该起作用.

Something like this should works.

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