MVC - Foreach循环内的Recordset

时间:2018-04-10 16:10:59

标签: c# asp.net-mvc razor

我是.NET MVC的新手并且正在尝试学习MVC。我知道我在这里做错了,所以我需要你的帮助。我尝试做的是列出一组10家公司,然后为每家公司列出基于companyID的联系人。请假设Entitites和DbContext设置正确,只是控制器和View之间的问题是我无法弄清楚如何:

这是我的模特:

namespace ERP.Models

    {
        [Table("ERP_Company")]
        public class ERP_Company
        {
            [Key]
            public int CompanyID { get; set; }
            public string Name { get; set; }
        }

        [Table("ERP_CompanyContact")]
        public class ERP_Contact
        {
            [Key]
            public int ContactID { get; set; }
            public string FirstName { get; set; }
            public string LastName { get; set; }
            public int CompanyID { get; set; }
        }
    }

从数据库获取公司和联系人列表的方法:

namespace ERP.Models
{
    public class Method1
    {
        private ERPEntities db = new ERPEntities();

        public List<ERP_Company> getCompanyList()
        {
            List<ERP_Company> companyList = (
                from c in db.ERP_Company
                where c.Name.Contains("Network")
                select c).Take(10).ToList();    
            return companyList;
        }

        public List<ERP_Contact> getContactList(int CompanyID)
        {
            List<ERP_Contact> contactList = (
                from cc in db.ERP_CompanyContact
                where cc.CompanyID == CompanyID
                select cc).Take(50).ToList();
            return contactList;
        }

    }
}

这是我的控制器,我做错了:

namespace ERP.Controllers
{
    public class Test1Controller : Controller
    {
        //private ERPEntities db = new ERPEntities();

        Method1 _repository = new Method1();     
        public ActionResult Index()
        {
            ViewData["Company"] = _repository.getCompanyList();
            ViewData["Contact"] = _repository.getContactList(CompanyID);  // <-- Incorrect Here, but just to show that I want to pass the CompanyID
            return View();
        }
    }
}

最后,我要列出公司的视图,然后根据CompanyID查询所有联系人并列出它们。

<ul>
    @foreach (var item in ViewData["Company"] as List <ERP.Models.ERP_Company> 
    )
    {         
        <li>@item.CompanyID | @item.Name</li>

        <!-- Here is an EXAMPLE that I want to QUERY the Contact recordset and list all the contacts based on the CompanyID -->
        <ul>
            @for (var i = 0; i < 5; i++)
                {<li>Contact @i</li>}                            
        </ul> 
    }
</ul>

是否可以在循环中循环接触模型(或记录集)?我怎么能做到这一点?

提前致谢,

1 个答案:

答案 0 :(得分:0)

以下是我如何实施您的案例,而不是以最好的方式,而是以简单的方式。

<强>实体:

public class Company
{
    public int Id { get; set; }
    public string Name { get; set; }
    public ICollection<Contact> Contacts { get; set; }
}

public class Contact
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int CompanyId { get; set; }
}

<强>服务

public class CompanyService
{
    public List<Company> getCompanyList()
    {
        using (ERPEntities db = new ERPEntities())
        {
            return db.Companies
                     .Include("Contacts")
                     .Where(e => e.Name.Contains("Network"))
                     .Take(10)
                     .ToList();
        }
    }
}

<强>控制器

public HomeController(CompanyService companyService)
{
    this.companyService = companyService;
}

public ActionResult Index()
{
    List<Company> companies = this.companyService.getCompanyList();

    return View(companies);
}

查看:

<ul>
    @foreach (var company in Model)
    {
        <li>@company.Id | @company.Name</li>

        if (company.Contacts.Count > 0)
        {
        <ul>
            @foreach (var contact in company.Contacts)
            {
                <li>@contact.FirstName</li>
            }
        </ul>
        }
    }
</ul>

另一方面,从您的实现来看,我觉得您可能需要在数据结构,C#/ OOP基础知识等基础技能方面进行更多工作,然后按照相应的顺序进行ASP.NET MVC。