按參數過濾和路由

Question

我有一個MachineInfo視圖頁面，該頁面顯示相關機器的60種不同規格，例如處理器信息，內存信息，磁盤信息，數據庫信息等。

此頁面的ActionLink為：

 @Html.ActionLink("Machine Info", "MachineInfo", new { id = Model.LicenseKey }) |

控制器 ：

public ActionResult MachineInfo(string LicenseKey)
    {
        if (LicenseKey == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Farm farm = db.Farms.Find(LicenseKey);
        if (farm == null)
        {
            return HttpNotFound();
        }
        return View(farm);
    }

農場模型：

public partial class Farm
{
    public Farm()
    {
        this.FarmChanges = new HashSet<FarmChange>();
        this.FarmDetails = new HashSet<FarmDetail>();
        this.FarmTables = new HashSet<FarmTable>();
    }

    public int Id { get; set; }
    public string LicenseKey { get; set; }
    public string Name { get; set; }
    public string CustomerName { get; set; }

    public virtual ICollection<FarmChange> FarmChanges { get; set; }
    public virtual ICollection<FarmDetail> FarmDetails { get; set; }
    public virtual ICollection<FarmTable> FarmTables { get; set; }
}

FarmDetails型號：

public partial class FarmDetail
{
    public System.Guid Id { get; set; }
    public int FarmId { get; set; }
    public int Type { get; set; }
    public string Name { get; set; }
    public string Value { get; set; }

    public virtual Farm Farm { get; set; }
}

所有MachineInfo都來自FarmDetails表中的“值”。

視圖：

@model IEnumerable<FarmManagement.Models.FarmDetail>

@{
    ViewBag.Title = "Machine Info";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Machine Info</h2>

<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Type)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Name)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Value)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Farm.LicenseKey)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.Type)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Name)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Value)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Farm.LicenseKey)
        </td>
        <td>
        </td>
    </tr>
}
</table>
 @Html.ActionLink("Back to Farms List", "Index")

我正在嘗試使用以下URL顯示特定計算機（LicenseKey = ABXYZ-XYZAB）的MachineInfo： mydomain.com/MachineInfo/ABXYZ-XYZAB

我需要通過LicenseKey 過濾視圖。

經過所有嘗試，我只得到400-錯誤請求錯誤（由於LicenseKey == null）或得到所有計算機的MachineInfo，而不是具有LicenseKey = ABXYZ-XYZAB的特定計算機。

我做錯了什么？

Answer 1

更改您的動作鏈接代碼

 @Html.ActionLink("Machine Info", "MachineInfo", new { id = Model.LicenseKey })

至

@Html.ActionLink("Machine Info", "MachineInfo", new { LicenseKey = Model.LicenseKey })

由於動作鏈接參數名稱應與控制器動作參數名稱匹配。

Answer 2

進行以下更改后解決了該問題：

更改后的新控制器：

public ActionResult MachineInfo(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            FarmDetail farmdetail = db.FarmDetails.Where(x => x.FarmId == id).FirstOrDefault();
            if (farmdetail == null)
            {
                return HttpNotFound();
            }
            return View(farmdetail);
        }

更改后的新視圖：

@model FarmManagement.Models.FarmDetail

@{
    ViewBag.Title = "Machine Info";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Machine Info</h2>

<table class="table">
    <tr>
        <th>
             @Html.DisplayNameFor(model => model.Type)
        </th>
         <th>
            @Html.DisplayNameFor(model => model.Name)
         </th>
        <th>
            @Html.DisplayNameFor(model => model.Value)
        </th>
         <th>
            @Html.DisplayNameFor(model => model.Farm.LicenseKey)
         </th>
         <th></th>
     </tr>

 @for (int i = 0; i < Model.Farm.FarmDetails.Count(); i++)
 {
     <tr>
        <td>
            @Html.DisplayFor(model => model.Farm.FarmDetails.ElementAt(i).Type)
        </td>
        <td>
             @Html.DisplayFor(model => model.Farm.FarmDetails.ElementAt(i).Name)
        </td>
        <td>
            @Html.DisplayFor(model => model.Farm.FarmDetails.ElementAt(i).Value)
        </td>
        <td>
            @Html.DisplayFor(model => model.Farm.LicenseKey)
        </td>
        <td>
    </tr>
}
</table>
@Html.ActionLink("Back to Farms List", "Index")

我需要在Controller中使用where語句；

FarmDetail farmdetail = db.FarmDetails.Where(x => x.FarmId == id).FirstOrDefault();

並從視圖中刪除IEnumerable ，並使用ElementAt（i）將@foreach更改為@for 。

@Html.DisplayFor(model => model.Farm.FarmDetails.ElementAt(i).Name)