需要從IEnumerable獲得ID <item>

Question

所以即時嘗試創建一個小網站來幫助我的家人的業務。

我有兩個模型，工作和天。

public class Job 
{ 
    public int JobId { get; set; } 
    public int LotNum { get; set; } 
    public string Street { get; set; } 
    public string Suburb { get; set; } 
    public double PerHour { get; set; } 
    public string Description { get; set; } 

} 

public class Day 
{ 
    public int JobId { get; set; } 
    public int DayId { get; set; } 
    public DateTime Date { get; set; } 
    public double Hours { get; set; } 
    public string Details { get; set; } 
    public int Invoice { get; set; } 
} 

我需要做一個發票，發票將被編號。這些日子有發票號碼，所以生病可以選擇所需的日子。 它看起來像這樣。

Date LotNum Street  Suburb  Hours 
    1/1/01 1 John Street Hurstville x hours 
    1/1/01 1 John Street Hurstville x hours 
    1/1/01 1 John Street Hurstville x hours 
    1/1/01 1 John Street Hurstville x hours 

我能夠使用這種特定的發票號碼，以獲得天：

vm.Days = _dayRepo.GetAll().Where(d => d.Invoice == id); 

通過這樣做，我有那一天的日期和時間，但現在我需要把工作信息。 Day和Job都有JobId，所以我可以將它們連接起來，但我不知道如何。

這是我到目前爲止有：

public IActionResult Invoice(int id) 
    { 
     CreateInvoiceViewModel vm = new CreateInvoiceViewModel(); 
     vm.Days = _dayRepo.GetAll().Where(d => d.Invoice == id); 
     //vm.JobId = 
     vm.Jobs = _jobRepo.GetAll(); 

     return View(vm); 
    } 

我的看法是這樣的：

@model CreateInvoiceViewModel 


<table> 

    @foreach (var item in Model.) 

    { 
      <tr> 
       <td>@item.Date.Date.ToString("dd/MM/yy")</td> 
       <td>@item.Hours</td> 


      </tr> 
    } 

</table> 

我不知道要放什麼東西在對foreach。

在此先感謝！

Answer 1

你只需要一個連接查詢。定義你的視圖模型，如：

public class InvoiceViewModel 
{ 
    public DateTime Date { get; set; } 

    public int LotNum { get; set; } 

    public string Street { get; set; } 

    public string Suburb { get; set; } 

    public double Hours { get; set; } 
} 

創建一個連接查詢並將其轉換爲視圖模型：

public IActionResult Invoice(int id) 
{ 
    var query = from d in _dayRepo.GetAll() 
          join job in _jobRepo.GetAll() on d.JobId equals job.JobId 
          select new { Date=d.Date, LotNum= job.job , Street =job.Street , Suburb =job.Suburb , Hours =d.Hours }; 

    IEnumerable<InvoiceViewModel> viewModel = query.Select(c => new InvoiceViewModel() 
    { 
    Date=query.Date, 
    LotNum=query.LotNum, 
    Street=query.Street, 
    Suburb=query.Suburb, 
    Hours=query.Hours 
    }); 

    return View(viewModel); 
} 

Answer 2

這將導致一個IEnumerable與IDS

var ids = _dayRepo.GetAll().Where(d => d.Invoice == id).Select(x => x.JobId); 

您還可以，如果你想把它當作一個列表中添加.ToList()到底。

Answer 3

這或多或少是我將如何設置它，或者如何，至少開始。

（我使用EntityFrameworkCore是的，我明白，你正在使用的那一刻回購）

public class Job 
{ 
    public int Id { get; set; } 
    public int LotNum { get; set; } 
    public string Street { get; set; } 
    public string Suburb { get; set; } 
    public double PerHour { get; set; } 
    public string Description { get; set; } 

    // Navigation Helper 
    public virtual ICollection<InvoiceJobRelationship> Invoices { get; set; } 
} 

public class Day 
{ 
    public int Id { get; set; } 
    public DateTime Date { get; set; } 
    public double Hours { get; set; } 
    public string Details { get; set; } 

    // Navigation Helper 
    public virtual ICollection<InvoiceDayRelationship> Invoices { get; set; } 
} 

public class Invoice 
{ 
    public int Id { get; set; } 

    // Navigation Helpers 
    public virtual ICollection<InvoiceJobRelationship> Jobs { get; set; } 
    public virtual ICollection<InvoiceDayRelationship> Days { get; set; } 
} 
public class InvoiceDayRelationship 
{ 
    public int InvoiceId { get; set; } 
    // Navigation Helper 
    [ForeignKey("InvoiceId")] 
    public Invoice Invoice { get; set; } 
    public int DayId { get; set; } 
    // Navigation Helper 
    [ForeignKey("DayId")] 
    public Day Day { get; set; } 
} 
public class InvoiceJobRelationship 
{ 
    public int InvoiceId { get; set; } 
    // Navigation Helper 
    [ForeignKey("InvoiceId")] 
    public Invoice Invoice { get; set; } 
    public int JobId { get; set; } 
    // Navigation Helper 
    [ForeignKey("JobId")] 
    public Job Job { get; set; } 
} 

然後在上下文

protected override void OnModelCreating(ModelBuilder builder) 
    { 
     base.OnModelCreating(builder); 

     builder.Entity<InvoiceDayRelationship>() 
      .HasKey(id => new { id.DayId, id.InvoiceId }); 
     builder.Entity<InvoiceJobRelationship>() 
      .HasKey(ij => new { ij.JobId, ij.InvoiceId }); 
    } 

    public DbSet<Invoice> Invoices { get; set; } 
    public DbSet<Day> Days { get; set; } 
    public DbSet<Job> Jobs { get; set; } 
    public DbSet<InvoiceDayRelationship> InvoiceDays { get; set; } 
    public DbSet<InvoiceJobRelationship> InvoiceJobs { get; set; } 

然後你就能夠非常來電任何你想要的。

（實例查詢）

(from x in context.Invoices where x.Id == id select x).Include(inv => inv.Days).Include(inv => inv.Jobs);