ASP.NET Boilerplate IRepository 扩展方法答案

【问题标题】：ASP.NET Boilerplate IRepository extension methodASP.NET Boilerplate IRepository 扩展方法
【发布时间】：2018-04-12 09:51:55
【问题描述】：

对于Organization Units，我们使用以下代码获取组织单位中的实体，包括其子组织单位。是否合理以及如何扩展IRepository 将此功能添加到所有实体？

public virtual List<Product> GetProductsInOuIncludingChildren(long organizationUnitId)
{
    var code = _organizationUnitRepository.Get(organizationUnitId).Code;

    var query =
        from product in _productRepository.GetAll()
        join organizationUnit in _organizationUnitRepository.GetAll() on product.OrganizationUnitId equals organizationUnit.Id
        where organizationUnit.Code.StartsWith(code)
        select product;

    return query.ToList();
}

【问题讨论】：

标签： c# repository extension-methods asp.net-boilerplate irepository

【解决方案1】：

首先，继承IMustHaveOrganizationUnit：

public class Product : Entity, IMustHaveOrganizationUnit
{
    public long OrganizationUnitId { get; set; }
}

然后定义扩展方法：

public static class RepositoryExtensions
{
    public static List<TEntity> GetAllInOuIncludingChildren<TEntity, TPrimaryKey>(
        this IRepository<TEntity, TPrimaryKey> repository,
        long organizationUnitId
    )
        where TEntity : class, IEntity<TPrimaryKey>, IMustHaveOrganizationUnit
    {
        using (var organizationUnitRepository = repository.GetIocResolver().ResolveAsDisposable<IRepository<OrganizationUnit, long>>())
        {
            var code = organizationUnitRepository.Object.Get(organizationUnitId).Code;

            var query =
                from entity in repository.GetAll()
                join organizationUnit in organizationUnitRepository.Object.GetAll() on entity.OrganizationUnitId equals organizationUnit.Id
                where organizationUnit.Code.StartsWith(code)
                select entity;

            return query.ToList();
        }
    }
}

用法：

var products = _productRepository.GetAllInOuIncludingChildren(organizationUnitId);

【讨论】：

【解决方案2】：

你可以使用下面的代码。

界面：

public interface ITestRepository : IRepository<Test, int>
{

}

类：

public class TestRepository : YourProjectNameRepositoryBase<Test, int>, ITestRepository
{
    public TestRepository(IDbContextProvider<YourProjectNameDbContext> dbContextProvider, IObjectMapper objectMapper)
        : base(dbContextProvider, objectMapper)
        {
        }
}

用法：

public class TestAppService : YouProjectNameAppServiceBase, ITestAppService
{
    private readonly ITestRepository _testRepository;
    public TestAppService(ITestRepository testRepository,
    
}

更新

在最新版本中，无需传递objectmapper，需要使用下面更新的构造函数：

public class TestRepository : YourProjectNameRepositoryBase<Test, int>, ITestRepository
{
    public TestRepository(IDbContextProvider<YourProjectNameDbContext> dbContextProvider)
        : base(dbContextProvider)
        {
        }
}

【讨论】：