显示来自不同数据库表的数据ASP.NET MVC

Question

编辑 - 我从原帖发了进展，现在对问题进行了相关修改。

在控制器中，我现在有一个名为lstSteps的变量，它带来了与相关执行相关的步骤的所有细节。

现在的问题是我无法在执行视图中显示此步骤列表。我知道我需要编写一个foreach循环，但无法弄清楚如何编写它。

控制器

public ActionResult Execution(int id = 0)
    {
        Execution execution = db.Executions.Find(id);

var lstSteps = db.Steps.Where(z => z.Execution.Id == id).ToList();  

        if (execution == null)
        {
            return HttpNotFound();
        }

        ViewBag.ExecutionSeconds = (execution.End - execution.Start).ToString(@"dd\.hh\:mm\:ss\.fff");

        return View(execution);

    }

执行模型

namespace DataIntelligence.Models
{
    [Table("Execution")]
    public class Execution
    {
        public int Id { get; set; }
        public Int16 PackageId { get; set; }
        public DateTime Start { get; set; }
        public DateTime End { get; set; }
        public Boolean Successful { get; set; }
    }
}

步骤模型

namespace DataIntelligence.Models
{
    [Table("Step")]
    public class Step
    {
        public int Id { get; set; }
        public int ExecutionId { get; set; }
        public string Name { get; set; }
        public DateTime Date { get; set; }

        public virtual Execution Execution { get; set; }
    }
}

执行视图

@model DataIntelligence.Models.Execution
@{
    ViewBag.Title = "Execution Details";
}
<script language="javascript" type="text/javascript" src="jquery-1.8.3.js">    </script>
<script>
function goBack() {
    window.history.back();
}
</script>
<div class="jumbotron">
    <h2>Execution Details</h2>
</div>

<fieldset>
    <legend>Execution Id - @Html.DisplayFor(model => model.Id)</legend>


    <div class="row">
        <div class="col-sm-3">
            <div class="display-label">
                @Html.DisplayNameFor(model => model.PackageId)
            </div>
            <div class="display-field">
                <a href="@Url.Action("Package", new { id=Model.PackageId})">       @Html.DisplayFor(model => model.PackageId) </a>
            </div>
        </div>

        <div class="col-sm-3">
            <div class="display-label">
                @Html.DisplayNameFor(model => model.Start)
            </div>
            <div class="display-field">
                @Html.DisplayFor(model => model.Start)
            </div>
        </div>
        <div class="col-sm-3">
            <div class="display-label">
                @Html.DisplayNameFor(model => model.End)
            </div>
            <div class="display-field">
                @Html.DisplayFor(model => model.End)
            </div>
        </div>
        <div class="col-sm-3">
            <div class="display-label">
                Execution Time
            </div>
            <div class="display-field">
                @ViewBag.ExecutionSeconds  
            </div>
        </div>
    </div>
    <div class="row">
        <div class="col-sm-3">
            <div class="display-label">
                @Html.DisplayNameFor(model => model.Successful)
            </div>
            <div class="display-field">
                @Html.DisplayFor(model => model.Successful)
            </div>
        </div>
     </div>
    <br />

</fieldset>

<table>
    <tr>
        <th>
            Step ID
        </th>
        <th>
            Name
        </th>
        <th>
            Date
        </th>
    </tr>

    @foreach (var ? in ?) {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Id)
            </td>
            <td style="width: 600px;">
                @Html.DisplayFor(modelItem => item.Name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Date)
            </td>
        </tr>
    }

</table>
<button class="btn btn-link" onclick="goBack()" style="padding-right: 0px; padding-top: 0px; padding-bottom: 0px; padding-left: 0px;">Back</button>

我相信我出错的部分是我放置的地方？

非常感谢帮助。

提前致谢。

Answer 1

因此，如果您拥有Step类的外键，请将导航属性添加到Execution类：

public virtual Execution Execution {get; set; }

您的Linq查询将如下所示：

var lstSteps = db.Steps.Where(z => z.Execution.Id == id).ToList(); 

这将为您提供所有Steps，其中执行ID等于您传递的ID。您可以通过lstSteps迭代并在视图中打印它。如果您知道它只有一个结果，那么请使用.FirstOrDefault()代替ToList()

编辑：

好的，所以你想要显示一个执行列表及其相应的步骤。

在Execution中添加其他导航属性：

public virtual ICollection<Step> Steps {get; set; }

将你的linq更改为（这也应该得到steps）：

var Executions = db.Executions.Find(id);

在你看来，你可以做一个foreach：

@foreach(var step in Model.Steps) 
{ 
    <label>Step id</label>step .Id; 
    <label>step Name </label>step.Name 
     ....
 } 

确保您的模型是：@model DataIntelligence.Models.Execution

Answer 2

只需定义一个这样的新类，并将其作为模型传递给您的视图

namespace DataIntelligence.Models
{

    public class ExecutionStep
    {
       public Execution Execution { get;set; }
       public List<Step> Steps { get;set; }  

       public static ExecutionStep Load(int executionStepId)
       {
           // load your execution and step data here and return it
           // within ExecutionStep class object
           ExecutionStep executionStep = new ExecutionStep();
           executionStep.Execution = db.Executions.Find(id); 
           executionStep.Steps = db..... // load steps from db
           return executionStep;
        }
    }
}

然后您可以加载ExecutionStep调用并将其传递给您的视图

public ActionResult Execution(int id = 0)
{
    // now this executionStep class object will serve as a modal 
    // for your view
    ExecutionStep executionStep = ExecutionStep.Load(id);      

    if (execution == null)
    {
        return HttpNotFound();
    }

    ViewBag.ExecutionSeconds = (execution.End - execution.Start).ToString(@"dd\.hh\:mm\:ss\.fff");

    return View(executionStep);
}

您可以在视图中访问它们

@Modal.Execution.Start
@foreach(var step in Modal.Steps)
{
}