从第一记录集访问数据

Question

我有一个LINQ查询返回几行。它有一个连接，因此它包含公司联系信息以及详细记录（因此每行重复的联系信息）。在我的视图页面上，我希望只在标题区域显示联系人信息一次，然后循环访问记录集以显示详细数据。

如何在没有循环的情况下访问第一条记录中的联系人数据？

有没有更好的方法？我避免将所有联系人字段填充到ViewBag变量中，因为我认为用单个数据库查询来获取它们会更加正确。

BTW获取代码块在这里工作的诀窍是什么？我总是点击代码按钮，然后直接从VS粘贴我的代码。有时候，颜色格式有效，有时不会。

<fieldset> 
    <legend>Contact Information</legend> 
    <div class="view-field"> 
     @Html.ValueFor(m => m.CompanyName) 
    </div> 
    <div class="view-field"> 
     @Html.ValueFor(m => m.Name) 
    </div> 
    <div class="view-field"> 
     @Html.ValueFor(m => m.Address1) 
    </div> 
    <div class="view-field"> 
     @Html.ValueFor(m => m.City) 
    </div> 
    <div class="view-field"> 
     @Html.ValueFor(m => m.State) 
    </div> 
    <div class="view-field"> 
     @Html.ValueFor(m => m.Zip) 
    </fieldset> 


     @foreach (var item in Model) 
     { 
      <tr> 
       <td> 
        @Html.DisplayFor(m => item.StatusDate) 
       </td> 
       <td> 
        @Html.DisplayFor(m => item.StatusName) 
       </td> 
       <td> 
        @Html.DisplayFor(m => item.StatusUserName) 
       </td> 
       <td> 
        @Html.DisplayFor(m => item.StatusNote) 
       </td> 
      </tr> 
     } 

编辑 与Boossss思想工作，我想出了这个LINQ和视图模型，但他们都不太让我一个可行的解决方案。我得到一个单独的记录集，其中包含VendorStatusHistory记录的子集合，这正是我想要的，它会抛出错误，试图显示视图模型的任何属性“不包含定义...并且不能找到扩展方法...”。我尝试使用Boossss viewmodel，但它给出了同样的错误。我怀疑我的LINQ查询已关闭。

已解决 根据Boossss的评论更新。

 public StatusHistoryView VendorStatusHistory(String id) 
    { 
     Guid pid = Guid.Parse(id); 

     StatusHistoryView query = _db.VendorProfiles 
      .Include("VendorStatusHistory") 
      .Include("StatusCodes") 
      .Select(s => new StatusHistoryView 
       { 
        ProfileID = s.ProfileID, 
        Name = s.Name, 
        CompanyName = s.CompanyName, 
        CompanyDBA = s.CompanyDBA, 
        Email = s.Email, 
        Phone = s.Phone, 
        Website = s.Website, 
        Address1 = s.Address1, 
        Address2 = s.Address2, 
        City = s.City, 
        State = s.State, 
        Zip = s.Zip, 
        VendorStatusHistory = s.VendorStatusHistories 
       } 
      ) 
      .Where(x => x.ProfileID == pid).SingleOrDefault();; 

     return query; 
    } 

public class StatusHistoryView 
{ 
    public StatusHistoryView() 
    { 
     this.VendorStatusHistory = new HashSet<VendorStatusHistory>(); 
    } 
    public System.Guid ProfileID { get; set; } 
    public int StatusID { get; set; } 

    [Display(Name = "Full Name")] 
    public string Name { get; set; } 

    [Display(Name = "Email")] 
    public string Email { get; set; } 

    [Display(Name = "Phone")] 
    public string Phone { get; set; } 

    [Display(Name = "Website")] 
    public string Website { get; set; } 

    [Display(Name = "Company")] 
    public string CompanyName { get; set; } 

    [Display(Name = "DBA")] 
    public string CompanyDBA { get; set; } 

    [Display(Name = "Address")] 
    public string Address1 { get; set; } 

    [Display(Name = "Address (extra)")] 
    public string Address2 { get; set; } 

    [Display(Name = "City")] 
    public string City { get; set; } 

    [Display(Name = "State")] 
    public string State { get; set; } 

    [Display(Name = "Zip Code")] 
    public string Zip { get; set; } 

    public virtual ICollection<VendorStatusHistory> VendorStatusHistory { get; set; } 
} 

和更新后的视图...

  @model VendorProfileIntranet.Models.StatusHistoryView 

<table id="VendorTable" width="100%" class="gradeA"> 
    <thead> 
     @foreach (var item in Model.VendorStatusHistory) 
     { 
     <tr> 
      <th style="width:200px"> 
       @Html.DisplayNameFor(m => item.DateCreated) 
      </th> 
      <th> 
       @Html.DisplayNameFor(m => item.Status) 
      </th> 
      <th> 
       @Html.DisplayNameFor(m => item.UserName) 
      </th> 
      <th> 
       @Html.DisplayNameFor(m => item.Notes) 
      </th> 
     </tr> 
      break; 
      } 
    </thead> 
    <tbody> 

@foreach (var item in Model.VendorStatusHistory) 
     { 
      <tr> 
       <td> 
        @Html.DisplayFor(m => item.StatusDate) 
       </td> 
       <td> 
        @Html.DisplayFor(m => item.StatusName) 
       </td> 
       <td> 
        @Html.DisplayFor(m => item.StatusUserName) 
       </td> 
       <td> 
        @Html.DisplayFor(m => item.StatusNote) 
       </td> 
      </tr> 

     } 
    </tbody> 
    </tbody> 
</table> 

Answer 1

我建议你没有与详细记录一起加入公司的联系方式，而不是创建一个视图模型，并把它作为您的视图模型像这样：

public class MyViewModel 
{ 
    public string CompanyName { get; set; } 
    public string Name { get; set; } 
    public string Address1 { get; set; } 
    public string City { get; set; } 
    public string State { get; set; } 
    public string Zip { get; set; } 

    public List<RecordDetail> Records { get; set; } 
} 

public class RecordDetail 
{ 
    public DateTime StatusDate { get; set; } 
    public string StatusName { get; set; } 
    public string StatusUserName { get; set; } 
    public string StatusNote { get; set; } 
} 

在此之后

您可以在视图中使用这样的：

@model MyViewModel 
<fieldset> 
<legend>Contact Information</legend> 
<div class="view-field"> 
    @Html.ValueFor(m => m.CompanyName) 
</div> 
<div class="view-field"> 
    @Html.ValueFor(m => m.Name) 
</div> 
<div class="view-field"> 
    @Html.ValueFor(m => m.Address1) 
</div> 
<div class="view-field"> 
    @Html.ValueFor(m => m.City) 
</div> 
<div class="view-field"> 
    @Html.ValueFor(m => m.State) 
</div> 
<div class="view-field"> 
    @Html.ValueFor(m => m.Zip) 
</fieldset> 


    @foreach (var item in Model.Records) 
    { 
     <tr> 
      <td> 
       @Html.DisplayFor(m => item.StatusDate) 
      </td> 
      <td> 
       @Html.DisplayFor(m => item.StatusName) 
      </td> 
      <td> 
       @Html.DisplayFor(m => item.StatusUserName) 
      </td> 
      <td> 
       @Html.DisplayFor(m => item.StatusNote) 
      </td> 
     </tr> 
    }