具有多个键的 ASP.net Core Crud答案

【问题标题】：ASP.net Core Crud with more then one key具有多个键的 ASP.net Core Crud
【发布时间】：2017-03-15 04:26:30
【问题描述】：

我的 CRUD 有问题，表中有一个以上的键。我解决了创建、更新和详细信息中的问题，但在删除中我不能。我可以打开删除页面，但在Controller.DeleteConfirmed() 中我无法传递 2 个键。

这里是view的代码（delete.cshtml）：

@model Teste_db.Models.Vdcped

@{
    ViewData["Title"] = "Delete";
}

<h2>Delete</h2>

<h3>Are you sure you want to delete this?</h3>
<div>
    <h4>Vdcped</h4>
    <hr />
    <dl class="dl-horizontal">
        <input type="hidden" asp-for="PedEmpCod" />
        <input type="hidden" asp-for="PedNum" />
        <dt>
            @Html.DisplayNameFor(model => model.PedSituacao)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedSituacao)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedCliCgc)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedCliCgc)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedArcCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedArcCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVenCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVenCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedComiss2)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedComiss2)
        </dd>
            @Html.DisplayNameFor(model => model.PedDtemi)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDtemi)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedDtultentrega)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDtultentrega)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedDtpgto)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDtpgto)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedCpgCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedCpgCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedTipo)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedTipo)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlmerc)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlmerc)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlacresc)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlacresc)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVldesc)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVldesc)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlavista)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlavista)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVltot)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVltot)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlicmretido)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlicmretido)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedDesconto)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDesconto)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlfrete)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlfrete)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedNrpedcli)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedNrpedcli)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedAcresc)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedAcresc)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedNfsimpfat)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedNfsimpfat)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedSimplesfat)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedSimplesfat)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedNfrem)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedNfrem)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlicmsubst)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlicmsubst)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedQtdparc)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedQtdparc)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlparcini)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlparcini)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlparcela)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlparcela)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVldesc2)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVldesc2)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedIndfrete)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedIndfrete)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedPrazo)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedPrazo)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedTpgCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedTpgCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedLocal)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedLocal)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedPedtroca)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedPedtroca)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlbaseicms)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlbaseicms)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlicms)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlicms)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedPorCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedPorCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedStpCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedStpCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedRotCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedRotCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedOcgNum)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedOcgNum)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlbasesubst)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlbasesubst)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedPesoliq1)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedPesoliq1)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedPesoliq2)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedPesoliq2)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedMotCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedMotCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedDtpreentrega)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDtpreentrega)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedCliCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedCliCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlpago)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlpago)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedDtimport)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDtimport)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedStimport)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedStimport)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedHoraini)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedHoraini)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedHorafin)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedHorafin)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedDtvis)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedDtvis)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedObsvis)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedObsvis)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedNfiSerie)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedNfiSerie)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedTnfCod)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedTnfCod)
        </dd>
        <dt>
            @Html.DisplayNameFor(model => model.PedVlipi)
        </dt>
        <dd>
            @Html.DisplayFor(model => model.PedVlipi)
        </dd>
        </dd>
    </dl>

    <form asp-action="Delete">
        <div class="form-actions no-color">
            <input type="submit" value="Delete" class="btn btn-default"  /> |
            <a asp-action="Index">Back to List</a>
        </div>
    </form>
</div>

VdcpedController 的代码。在 delete 中，id 和 ped 正常，但在 DeleteConfirmed 中，id 正常，ped 为空。

public async Task<IActionResult> Delete(string id, Int32 ped)
{   
    if (id == null)
    {
        return NotFound();
    }

    var vdcped = await _context.Vdcped
        .SingleOrDefaultAsync(m => m.PedEmpCod == id && m.PedNum == ped);
    if (vdcped == null)
    {
        return NotFound();
    }

    return View(vdcped);
}

// POST: Vdcped/Delete/5        
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteConfirmed(string id, Int32 ped)
{

    var vdcped = await _context.Vdcped.SingleOrDefaultAsync(m => m.PedEmpCod == m.PedEmpCod && m.PedNum == ped);
    _context.Remove(vdcped);
    await _context.SaveChangesAsync();
    return RedirectToAction("Index");
}

【问题讨论】：

需要更多信息 - 您的视图是否包含以 ped 为名称的对应字段？还是查询字符串有这样的键值组合？我要问的是，这个方法是怎么调用的？
我有意见。视图为删除。从索引视图开始，我在列表中选择删除，去查看确认删除。在此视图中，当我单击此按钮时，有一个按钮 DELETE，出现错误。在调试中，我看到变量 ped 为空，但变量 ID 正常
为单击删除按钮的页面添加代码 - 很难弄清楚您提供的内容有什么问题。

标签： asp.net-mvc model-view-controller

【解决方案1】：

考虑将隐藏的输入移动到表单标签的范围内：

<form asp-action="Delete">
    <input type="hidden" asp-for="PedEmpCod" />
    <input type="hidden" asp-for="PedNum" />

    <div class="form-actions no-color">
        <input type="submit" value="Delete" class="btn btn-default"  /> |
        <a asp-action="Index">Back to List</a>
    </div>
</form>

这样，在提交表单时，字段实际上是提交给控制器的。

此外，您可能需要将 DeleteConfirmed 的签名更改为以下内容：

public async Task<IActionResult> DeleteConfirmed(string id, Int32 PedNum)

【讨论】：