Question

我有一个返回几行的LINQ查询。它有一个连接，因此它包含公司联系信息和详细记录（因此每行重复联系信息）。在我的视图页面上，我希望只在标题区域中显示一次联系信息，然后遍历记录集以显示详细数据。

如何在不循环的情况下访问第一条记录中的联系人数据？

有更好的方法吗？我避免将所有联系人字段填充到ViewBag变量中，因为我认为使用单个数据库查询获取它们更为正确。

BTW让代码块在这里工作的诀窍是什么？我总是单击代码按钮，然后直接从VS粘贴我的代码。有时颜色格式化有效，有时则不然。

    <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>
        }

修改使用Boossss的想法，我提出了这个LINQ和ViewModel，但他们并没有给我一个有效的解决方案。我得到一个包含VendorStatusHistory记录子集的记录集，这正是我想要的，它会在尝试显示viewmodel的任何属性时抛出错误“不包含定义......并且找不到扩展方法......”。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。

解决根据Boossss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

我建议您没有加入公司的联系信息以及详细记录，而是创建一个viewmodel并将其作为您的视图模型传递：

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; }
}

之后你可以在你的视图中使用它：

@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>
    }

从第一个记录集访问数据

1 个答案: