如何使用MVC在ViewModel中使用PaginatedList [英] How to use PaginatedList with ViewModel using MVC

问题描述

我正在尝试找到一种使用ViewModel创建PaginatedList的解决方案.

I am trying to find a solution for creating a PaginatedList with a ViewModel.

教程(仅使用普通模型)

https://docs.microsoft.com/zh-cn/aspnet/core/data/ef-mvc/sort-filter-page?view=aspnetcore-2.1

类似问题

如何在MVC中通过ViewModel进行分页会吗?

使用ViewModel和分页的MVC/实体框架核心

我的代码

控制器

public async Task<IActionResult> Index(string sortOrder, string currentFilter, string searchString, int? page)
        {
            ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";

            if (searchString != null)
            {
                page = 1;
            }

            else
            {
                searchString = currentFilter;
            }

            ViewData["CurrentFilter"] = searchString;

            var palletAccounts = from p in _context.PalletAccount
                select p;

            if (!String.IsNullOrEmpty(searchString))
            {
                palletAccounts = palletAccounts.Where(s => s.AccountName.Contains(searchString));
            }

            switch (sortOrder)
            {
                case "name_desc":
                    palletAccounts = palletAccounts.OrderByDescending(s => s.AccountName);
                    break;
                default:
                    palletAccounts = palletAccounts.OrderBy(s => s.AccountName);
                    break;
            }

            var palletAccountSelectListItems = (from p in _context.PalletAccount
                select p.PalletGroupName).Distinct().Select(a => new SelectListItem(a,a));

            int pageSize = 10;

            return View(new PalletAccountViewModel { PalletAccounts = await PaginatedList<PalletAccount>.CreateAsync(palletAccounts.AsNoTracking(), page ?? 1, pageSize), GroupNames = await palletAccountSelectListItems.ToListAsync()});
        }

ModelView

 public class PalletAccountViewModel
    {
        public PalletAccount PalletAccount { get; set; }
        public IEnumerable<PalletAccount> PalletAccounts { get; set; }
        public IEnumerable<SelectListItem> GroupNames { get; set; }
    }

索引页(剃刀)

   @model PaginatedList<PalletPortal.Models.ViewModels.PalletAccountViewModel> <--if I use the model without PaginatedList it works fine (except the paging obviously).


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

<div class="space"></div>

<section class="main-section">
    <table class="table" id="tableCenter">
        <thead>
            <tr>
                <th>
                    <a asp-action="Index" asp-route-sortOrder="@ViewData["NameSortParm"]" asp-route-currentFilter="@ViewData["CurrentFilter"]">@Html.DisplayNameFor(model => model.PalletAccount.AccountName)</a>
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.PalletAccount.PalletGroupName)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.PalletAccount.PalletAccountType)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.PalletAccount.IsActive)
                </th>
                <th> <button class="button" id="myBtn"><span>Skapa pallkonto </span></button></th>
            </tr>
        </thead>
        <tbody>

            @foreach (var item in Model.PalletAccounts)
            {
                <tr>
                    <td>
                        @Html.DisplayFor(modelItem => item.AccountName)
                    </td>
                    <td>
                        @Html.DisplayFor(modelitem => item.PalletGroupName)
                    </td>
                    <td>
                        @Html.DisplayFor(modelitem => item.PalletAccountType)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.IsActive, new { @class = "checkbox" })
                    </td>
                    <td>
                        <a asp-action="Delete" asp-route-id="@item.ID"><button class="button" style="vertical-align: middle"><span>Radera </span></button></a>
                        <a asp-action="Edit" asp-route-id="@item.ID"><button class="button" style="vertical-align: middle"><span>Redigera </span></button></a>
                    </td>
                </tr>
            }
        </tbody>
    </table>
    @{
        var prevDisabled = !Model.HasPreviousPage ? "disabled" : "";
        var nextDisabled = !Model.HasNextPage ? "disabled" : "";
    }

    <a asp-action="Index"
       asp-route-sortOrder="@ViewData["CurrentSort"]"
       asp-route-page="@(Model.PageIndex - 1)"
       asp-route-currentFilter="@ViewData["CurrentFilter"]"
       class="btn btn-default @prevDisabled">
        Previous
    </a>
    <a asp-action="Index"
       asp-route-sortOrder="@ViewData["CurrentSort"]"
       asp-route-page="@(Model.PageIndex + 1)"
       asp-route-currentFilter="@ViewData["CurrentFilter"]"
       class="btn btn-default @nextDisabled">
        Next
    </a>

我无法在索引"页面("PalletAccount"和"palletAcAccounts")中访问我的模型.

I cannot access my models in the Index-page (PalletAccount and palletAccounts).

例如: model =>model.PalletAccount.AccountName 有人可以指出我正确的方向吗?

For example: model => model.PalletAccount.AccountName Can someone point me in the right direction?

提前谢谢.

推荐答案

您的控制器正在将 PalletAccountViewModel 的实例传递给视图，因此您需要将视图中的模型更改为

Your controller is passing an instance of PalletAccountViewModel to the view, therefore you need to change the model in the view to

@model PalletAccountViewModel

然后，由于要对 PalletAccounts 属性进行分页，因此需要将视图模型更改为

Then since you want paginate the PalletAccounts property, you need to change the view model to

public class PalletAccountViewModel
{
    public PalletAccount PalletAccount { get; set; }
    public PaginatedList<PalletAccount> PalletAccounts { get; set; } // change
    public IEnumerable<SelectListItem> GroupNames { get; set; }
}

并在视图中

@{
    var prevDisabled = !Model.PalletAccounts.HasPreviousPage ? "disabled" : "";
    var nextDisabled = !Model.PalletAccounts.HasNextPage ? "disabled" : "";
}

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