如何传递参数以包含在 URL 中？

Question

在 WebApi 项目的存储库类中有 GetSingleIncluding() 方法，它返回一个实体，其中包含作为参数传递的包含对象。

private readonly EFDbContext _context;
private IDbSet<T> _entities;            
private IDbSet<T> Entities
{
    get
    {
        _entities = _entities ?? _context.Set<T>();
        return _entities;
    }
}               
public T GetSingleIncluding(int id, params Expression<Func<T, object>>[] includeProperties)
{
    var query = Entities.Where(x => x.ID == id);

    foreach (var includeProperty in includeProperties)
    {
        query = query.Include(includeProperty);
    }

    return query.First();
}

我在控制器中有一个动作

public HttpResponseMessage GetFull(int id, string entities)

我把它用作：

var entitiy = Repository.GetSingleIncluding(id, x => x.Person);

这里我明确传递了一个参数x => x.Persons

有没有办法通过url请求传递这个参数？例如，我会将所有对象（可以包含在当前实体中）作为字符串传递给 url

http://localhost/api/House/1/Person,Address,...

控制器会将这些参数传递给GetSingleIncluding() 方法：

Repository.GetSingleIncluding(id, x => x.Person, y => y.Address);

房屋实体

public class House : BaseEntity
{
        public int PersonID { get; set; }
        public int HouseID { get; set; }
        public int AddressID { get; set; }
        ...
        public virtual Person Person { get; set; }        
        public virtual Address Address { get; set; }
 }

Answer 1

我同意 Epic 先生的观点，我认为从 url 获取“包含”不是一个好主意。无论如何，您可以将字符串数组传递给您的方法：

public T GetSingleIncluding(int id, string[] includeProperties)
{
    var query = Entities.Where(x => x.ID == id);

    if (includeProperties != null && includeProperties.Count() > 0)
    {
        query = query.Include(includes.First());
        foreach (var include in includeProperties.Skip(1))
            query = query.Include(include);
    }

    return query.First();
}

你需要添加这个“使用”：

using System.Data.Entity;

Answer 2

您应该看看 odata。它具有添加包含的内置功能。看看这个link 并了解 $expand 参数。