Question

在传统MVC和.net核心之间的转换中，当我在两种技术中使用几乎相同的代码时，我遇到了一些古怪的东西。

我将id字段的参数和发送控制器的名称从视图传递到接收控制器。下面的代码适用于传统的MVC：

<td>
    @Html.ActionLink("Edit", "Edit", new { id = item.Id }) |
    @Html.ActionLink("Details", "Details", new { id = item.Id }) |
    @Html.ActionLink("Delete", "Delete", new { id = item.Id })
    @Html.ActionLink("New Comment", "Create", "ServiceRequestNotes", new { ServiceRequest = item.Id, returncontroller = "ServiceRequests" }, null)<br />
</td>

并且

// POST: ServiceRequestNotes/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create([Bind(Include = "Id,NoteDescription,LastUpdated,WrittenBy,ServiceRequest")] ServiceRequestNote serviceRequestNote, string returncontroller)
{
    if (ModelState.IsValid)
    {
        db.ServiceRequestNotes.Add(serviceRequestNote);
        serviceRequestNote.LastUpdated = DateTime.Now;
        serviceRequestNote.WrittenBy = User.Identity.Name;
        await db.SaveChangesAsync();
        //return Redirect(ControllerContext.HttpContext.Request.UrlReferrer.ToString());
            return RedirectToAction("Index", returncontroller);
    }
    ViewBag.ServiceRequest = new SelectList(db.ServiceRequests, "Id", "RequestHeading", serviceRequestNote.ServiceRequest);
    return View(serviceRequestNote);
}

当我调试并且成功保存

时，立即填充returncontroller值

我在.net Core中的代码几乎相同

<td>
    <a asp-action="Edit" asp-route-id="@item.Id">Edit</a> |
    <a asp-action="Details" asp-route-id="@item.Id">Details</a> |
    <a asp-action="Delete" asp-route-id="@item.Id">Delete</a> |
    @Html.ActionLink("New Comment", "Create", "ServiceRequestNotes", new { ServiceRequest = item.Id, returncontroller = "TeamServiceRequests" }, null)<br />
</td>

和

// POST: ServiceRequestNotes/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for 
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("Id,NoteDescription,LastUpdated,WrittenBy,ServiceRequest")] ServiceRequestNotes serviceRequestNotes, string returncontroller)
{
    if (ModelState.IsValid)
    {
        _context.Add(serviceRequestNotes);
        serviceRequestNotes.LastUpdated = DateTime.Now;
        serviceRequestNotes.WrittenBy = User.Identity.Name;
        await _context.SaveChangesAsync();
        //return RedirectToAction(nameof(Index));
        return RedirectToAction("Index", returncontroller);
    }
    ViewData["ServiceRequest"] = new SelectList(_context.ServiceRequests, "Id", "RequestDescription", serviceRequestNotes.ServiceRequest);
    return View(serviceRequestNotes);
}

但是在调试中 - 当它到达公共异步创建行时，returncontroller的值为null。

它仍然保存了注释，但由于上面的内容为null，它返回到notescontroller的索引视图而不是原始注释视图。

任何人都知道为什么在.net核心中，当代码几乎相同时，returncontroller值会变为null？感谢

如何在.net core 2.0中的视图和控制器之间传递多个参数？

0 个答案: