從第一記錄集訪問數據

Question

我有一個LINQ查詢返回幾行。它有一個連接，因此它包含公司聯繫信息以及詳細記錄（因此每行重複的聯繫信息）。在我的視圖頁面上，我希望只在標題區域顯示聯繫人信息一次，然後循環訪問記錄集以顯示詳細數據。

如何在沒有循環的情況下訪問第一條記錄中的聯繫人數據？

有沒有更好的方法？我避免將所有聯繫人字段填充到ViewBag變量中，因爲我認爲用單個數據庫查詢來獲取它們會更加正確。

BTW獲取代碼塊在這裏工作的訣竅是什麼？我總是點擊代碼按鈕，然後直接從VS粘貼我的代碼。有時候，顏色格式有效，有時不會。

<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> 
     } 

編輯 與Boossss思想工作，我想出了這個LINQ和視圖模型，但他們都不太讓我一個可行的解決方案。我得到一個單獨的記錄集，其中包含VendorStatusHistory記錄的子集合，這正是我想要的，它會拋出錯誤，試圖顯示視圖模型的任何屬性「不包含定義...並且不能找到擴展方法...」。我嘗試使用Boossss viewmodel，但它給出了同樣的錯誤。我懷疑我的LINQ查詢已關閉。

已解決 根據Boossss的評論更新。

 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; } 
} 

和更新後的視圖...

  @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

我建議你沒有與詳細記錄一起加入公司的聯繫方式，而不是創建一個視圖模型，並把它作爲您的視圖模型像這樣：

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; } 
} 

在此之後

您可以在視圖中使用這樣的：

@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> 
    }