Question

我有一些通常看起来像这样的存储库

public class DepartmentsRepository
{
    private PersonnelActionFormDataContext db = new PersonnelActionFormDataContext();

    /// <summary>
    /// returns all departments
    /// </summary>
    /// <returns>an iquerable of all departments</returns>
    public IQueryable<Department> GetAll()
    {
        return db.Departments;
    }

    /// <summary>
    /// Get department by id
    /// </summary>
    /// <param name="id">id of the department</param>
    /// <returns>a null department if nothing is found</returns>
    public Department Get(int id)
    {
        return db.Departments.SingleOrDefault(d => d.id == id);
    }

    /// <summary>
    /// Get department by department name
    /// </summary>
    /// <param name="department">name of the department</param>
    /// <returns>a null department if nothing is found</returns>
    public Department Get(string department)
    {
        return db.Departments.SingleOrDefault(d => d.DepartmentName == department);
    }

    /// <summary>
    /// Add a department
    /// </summary>
    /// <param name="department"></param>
    public void Add(Department department)
    {
        db.Departments.InsertOnSubmit(department);
    }

我想要某种通用基类可以节省一些打字，所以我从这里开始

 public class GenericRepository<T>
{
    private PersonnelActionFormDataContext db = new PersonnelActionFormDataContext();

    public IQueryable<T> GetAll()
    {
        return db.
    }
}

如何访问Ts的集合以返回它们？这可能吗？

感谢您的帮助。

Answer 1

对于Linq-to-SQL，这应该有效：

public IQueryable<T> GetResultL2S<T>() where T : class {
    MyDataContext db = new MyDataContext();
    return db.GetTable<T>();
}

或者，如果您使用的是Entity Framework，那么您可以执行以下操作：

public IQueryable<T> GetResultEF<T>() {
    YourEntities db = new YourEntities();
    return db.CreateQuery<T>(String.Format("[{0}s]", typeof(T).Name));
}

假设您的实体集可以通过添加s来复数。如果情况并非如此，请查看System.Data.Entity.Design.PluralizationServices.PluralizationService

C＃Linq-to-SQL创建通用存储库

1 个答案: