首先使用Entity框架代码实现Generic Repository

问题描述：

我遇到了我的关于实施框架的通用仓库模式和单位的第一次尝试。我不是在手项目中使用MVC。
请看一看这个方法包括在通用仓库等级：

I'm experiencing my first try on implementing Generic Repository Pattern and Unit of framework. I'm not using MVC on the project in hand. Please take a look at this method included in Generic Repository class:

public virtual IEnumerable<TEntity> Get(
        Expression<Func<TEntity, bool>> filter = null,
        Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
        string includeProperties = "")
    {
        IQueryable<TEntity> query = dbSet;

        if (filter != null)
        {
            query = query.Where(filter);
        }

        foreach (var includeProperty in includeProperties.Split
            (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
        {
            query = query.Include(includeProperty);
        }

        if (orderBy != null)
        {
            return orderBy(query).ToList();
        }
        else
        {
            return query.ToList();
        }
    }

它必须是一个有效的方法，并完成的目标枯井。
我的问题是，我不能为了结果作为降？任何人都可以编写一些代码行，以帮助我在这？谢谢，

it must be a powerful method and accomplishes the goal of DRY well. My problem is that, I cannot order the result as descending? Can anyone write some lines of code to help me on this? Thanks,

答

要按照产品类别进行筛选，试试这个：

To filter by product category, try this:

var repo = new GenericRepository<Product>();

var results = repo.Get(
    p => p.Category.Name == "Foo");

下面我们声明的通用信息库的一个实例，与产品的实体类型，然后我们通过一个LAMDA表达式执行每个产品的类别名称为富的过滤。

Here we declare an instance of the Generic Repository, with an entity type of Product, then we pass a lamda expression that performs the filtering on each Product's Category whose name is "Foo".

首先使用Entity框架代码实现Generic Repository

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