如何将 C# 中两个 DTO 的结果组合成一种类型的列表

How to combine the results of two DTOs in C# into one list of one type

我有一个 C# 网络应用程序,目前正在从两个数据库中提取数据。其中一个数据库有一个名为 table 的资源,其中包含员工详细信息,另一个数据库包含对在公司网络应用程序中收集的详细信息的视图。

我需要为每个 'active' 员工创建一个列表,其中还列出了他们的网络应用程序历史记录。

我想 return 类型为 ResourceDTO 的列表,每个用户在另一个列表中包含 WebAppDTO 的结果。

理想情况下,我将能够在 Angular 中进行操作,创建一个 table 列出员工姓名,并在下一列 "tally" 中列出他们参与的次数。每个计数都将是一个 link,然后使用 webappID 显示该员工的详细信息。

C# Question for Satckoverflow

//Web Api

public List<ResourceDTO> GetWebAppLeaders()
        {
            List<ResourceDTO> webappLeaders = new List<ResourceDTO>();

            //Linq to get a list of employees that take part of Web App
            var people = from x in _staffCtx.Resources
                         where (x.Active.HasValue && x.Active.Value && x.ManagerID.HasValue && x.FirstName.Length > 0)
                         select new ResourceDTO()
                         {
                             FirstName = x.FirstName,
                             LastName = x.LastName,
                             ResourceID = x.ResourceID,
                         };

            webappLeaders = people.ToList();

            //currently loops through each member of staff in list above and grabs their web app history.
            foreach (var person in people)
            {
                int personID = person.ResourceID;

                var webappHistory = from u in _webappCtx.CompanyWebAppViews
                                    where (u.PupilID == personID || u.TeacherID == personID)
                                    select new WebAppDTO()
                                    {
                                        webappDate = u.webappDate.ToString(),
                                        webappID = u.ID,
                                    };
                webappHistory.ToList();
            }

            //webappLeaders.ToList();

            // successfully returns list of Employees as filtered out by where clause.
            return webappLeaders;

        }

'//ResourceDTO.cs

 public class ResourceDTO
    {
        public int ResourceID { get; set; }
        public string Email { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string JobTitle { get; set; }
        public string ExtensionNumber { get; set; }
        public string MobileNumber { get; set; }
        public string MobileSpeedDial { get; set; }
        public string IMAddress { get; set; }
        public int? ManagerID { get; set; }
        public string ManagerName { get; set; }
        public string DepartmentType { get; set; }

        // Other field you may need

        //web app specific
        public List<WWebAppDTO> webappPupil { get; set; }

        public List<WebAppsDTO> webappTeacher { get; set; }

    }

//WebAppDTO.cs

    public class WebAppDTO
    {
        public int webappID { get; set; }
        public string pupilName { get; set; }
        public string teacherName { get; set; }

        public string webappDate { get; set; }

        public string pupilLearnt { get; set; }

        public string pupilComments { get; set; }

        public string teacherComments { get; set; }

    }

如果我未能理解一些重要概念,请提前致歉,C# MVC 对我来说是新手。

我将不胜感激一些示例代码。

谢谢。

也许我误解了这个问题,但据我所知,您只需要通过在 for 循环中查询来初始化这两个列表?

foreach (var person in people)
{
   int personID = person.ResourceID;   
   person.webappPupil = from u in _webappCtx.CompanyWebAppViews
                        where (u.PupilID == personID)
                        select new WebAppDTO()
                        {
                           webappDate = u.webappDate.ToString(),
                           webappID = u.ID,
                        }.ToList();
   person.webappTeacher = from u in _webappCtx.CompanyWebAppViews
                        where (u.TeacherID == personID)
                        select new WebAppDTO()
                        {
                           webappDate = u.webappDate.ToString(),
                           webappID = u.ID,
                        }.ToList();   
}

对代码的以下更改解决了我的问题。

//WebApi

public List<ResourceDTO> GetWebAppLeaders()
    {
        List<ResourceDTO> webappLeaders = new List<ResourceDTO>();

        //Linq to get a list of employees that take part of WebApp
        var people = from x in _staffCtx.Resources
                     where (x.Active.HasValue && x.Active.Value && x.ManagerID.HasValue && x.FirstName.Length > 0)
                     select new ResourceDTO()
                     {
                         FirstName = x.FirstName,
                         LastName = x.LastName,
                         ResourceID = x.ResourceID,
                     };

        webappLeaders = people.ToList();


        foreach (var person in webappLeaders)
        {
            int personID = person.ResourceID;

            person.webappPupil = from u in _webappCtx.CompanyWebAppViews
                                 where (u.PupilID == personID)
                                 select new WebappDTO()
                                 {
                                     webappID = u.ID,
                                 };
            person.webappPupil.ToList();

            person.webappTeacher = from u in _webappCtx.CompanyWebAppViews
                                   where (u.TeacherID == personID)
                                   select new WebappDTO()
                                   {
                                       webappID = u.ID,
                                   };
            person.webappTeacher.ToList();
        }


        return webappLeaders.ToList();

    }


//ResourceDTO
    public class ResourceDTO
{
    public int ResourceID { get; set; }
    public string Email { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string JobTitle { get; set; }
    public string ExtensionNumber { get; set; }
    public string MobileNumber { get; set; }
    public string MobileSpeedDial { get; set; }
    public string IMAddress { get; set; }
    public int? ManagerID { get; set; }
    public string ManagerName { get; set; }
    public string DepartmentType { get; set; }

    //WebApp specific
    public IQueryable<WebAppDTO> webappPupil { get; set; }

    public IQueryable<WebAppDTO> webappTeacher { get; set; }

}


//WebAppDTO

public class WebAppDTO
{
    public int webappID { get; set; }
    public string pupilName { get; set; }
    public string teacherName { get; set; }

    public string webappDate { get; set; }

    public string pupilLearnt { get; set; }

    public string pupilComments { get; set; }

    public string teacherComments { get; set; }

    public List<WebAppDTO> WebApp { get; set; }

}

扩展 Stephen Vakil 的回答,for each 循环抱怨 IQeuryable 类型转换为 List 类型。为了解决这两个在 ResourceDTO 中创建的 IQueryable 类型的方法,然后能够将结果转换为列表,在 WebAppDTO 中创建了一个 tpye List 方法,最后一步涉及执行分配 webappLeaders = people.ToList()并将其送入 foreach 循环。现在的结果是 return 一个员工列表,其中包含他们的 Web 应用程序历史记录的更多列表。