如何将匿名对象的 LINQ 查询通用列表转换为 IEnumerable<object>

Question

我有以下存储库方法，我试图将 LINQ 查询 ToList 结果转换为我的返回类型，但无济于事。任何建议将不胜感激。

public class ProjectRepository : IProjectRepository
{
    IDBEntities DBContext;
    public ProjectRepository(IDBEntities db)
    {
        DBContext = db;
    }
    public IEnumerable<project> SelectAll(bool? is_debug_mode, int? performed_by_id)
    {
        var projects = (from p in DBContext.projects
                        join o in DBContext.organizations on p.organization_id equals o.organization_id
                        join m in DBContext.members on o.organization_id equals m.organization_id
                        where m.member_id == performed_by_id
                        select new
                        {
                            p
                        }).ToList();
        return (IEnumerable<project>)projects;
    }
}

我收到的错误是：

无法转换类型的对象 'System.Collections.Generic.List1[<>f__AnonymousType21[NameSpace.Data.project]]' 输入 'System.Collections.Generic.IEnumerable`1[NameSpace.Data.project]'。

Answer 1

假设 linq 查询中的 p 是 project 类型

var projects = (from p in DBContext.projects
                join o in DBContext.organizations on p.organization_id equals o.organization_id
                join m in DBContext.members on o.organization_id equals m.organization_id
                where m.member_id == performed_by_id
                select p).ToList();
return projects;