Question

这是我的控制器：

public async Task<IActionResult> Index(string sortOrder, string currentFilter, string searchString, int? page)
    {
        var user = await _userManager.GetUserAsync(HttpContext.User);

        ViewData["CurrentSort"] = sortOrder;
        ViewData["GenreSortParm"] = string.IsNullOrEmpty(sortOrder) ? "genre_desc" : "";
        ViewData["DateSortParm"] = sortOrder == "Date" ? "date_desc" : "Date";
        ViewData["CurrentFilter"] = searchString;

        var userBooks = _userService.PagedUserBooks(user, sortOrder, currentFilter, searchString, page);
        var result = await PaginatedList<Book>.CreateAsync(userBooks, page ?? 1, 5);

        return View(result);
    }

“ userBooks”是一个IQueryable，因此可以在“ CreateAsync”中传递它，而我传递给View的“结果”是PaginatedList

在我的视图中，我正在使用@model PaginatedList<Book>，这是我的视图这一部分的问题

<tbody>
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @item.Genre
            </td>
            <td>
                @item.Title
            </td>
            <td>
                @item.CreatedOn
            </td>
            <td>
                <a asp-controller="Book" asp-action="MakeReview" asp-route-id="@item.Id" class="btn btn-success">Add Review</a>                    
            </td>
        </tr>
    }
</tbody>

我使用asp-route-id="@item.Id"，它是项目的ID，即Book，因此我可以将ID传递给<a asp-controller="Book" asp-action="MakeReview" asp-route-id="@item.Id" class="btn btn-success">Add Review</a>中指定的操作“ MakeReview” 但是当我使用动作方法

[HttpGet]
    public async Task<IActionResult> MakeReview(int bookId)
    {
        var user =  await _userManager.GetUserAsync(HttpContext.User);
        var book = await _bookService.GetById(user, bookId);

        //Not fully implemented
        return View();
    }

作为参数传递的int bookId应该是我选择查看的书的ID，但始终为0。这与将PaginatedList用作模型有关，而在类中我没有Id的属性？这是我的课程“ PaginatedList”

public class PaginatedList<T> : List<T>
{
    public int PageIndex { get; private set; }
    public int TotalPages { get; private set; }

    public PaginatedList(List<T> items, int count, int pageIndex, int pageSize)
    {
        PageIndex = pageIndex;
        TotalPages = (int)Math.Ceiling(count / (double)pageSize);
        this.AddRange(items);
    }

    public bool HasPreviousPage
    {
        get
        {
            return (PageIndex > 1);
        }
    }

    public bool HasNextPage
    {
        get
        {
            return (PageIndex < TotalPages);
        }
    }

    public static async Task<PaginatedList<T>> CreateAsync(IQueryable<T> source, int pageIndex, int pageSize)
    {
        var count = await source.CountAsync();
        var items = await source.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToListAsync();
        return new PaginatedList<T>(items, count, pageIndex, pageSize);
    }
}

更新：当操作MakeReview中的参数类型为Book而不是int类型，并且我将int的ID传递给Action时，则模型绑定工作了，当然，除了ID之外，所有内容都为空。

从视图到操作，使用PaginatedList <book>传递的ID为0

0 个答案: