在 asp.net 核心中向剃刀视图添加分页

Question

我一直在关注我在 Microsoft 找到的一篇关于如何在 C# 中向项目添加分页的简单文章。这是文章：https://docs.microsoft.com/en-us/aspnet/core/data/ef-mvc/sort-filter-page?view=aspnetcore-2.1

现在，在阅读本文时，当我想将数据传递给视图时，我在最后遇到了一个问题。让我分享一些我的代码，以便你们更好地理解它：

我从 microsft 获得的分页列表：

    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);
        }
    }

我在控制器上使用的方法：

    [HttpGet("search/{option?}/{search}")]
    public  IActionResult GetSearchData(string option, string search, int? page, string currentFilter)
    {
        if (search != null)
        {
            page = 1;
        }
        else
        {
            search = currentFilter;
        }
        SearchViewModel data = new SearchViewModel();

        var searchArticle = Mapper.Map<IEnumerable<SearchDataItemViewModel>>(_unitOfWork.Articles.GetByString(search));
        data.SearchArticle = searchArticle;

        var searchArticle2 = Mapper.Map<IEnumerable<SearchDataItemViewModel>>(_unitOfWork.Articles2.GetByString(search));
        data.SearchArticle2 = searchArticle2;

        var searchArticle3 = Mapper.Map<IEnumerable<SearchDataItemViewModel>>(_unitOfWork.Articles3.GetByString(search));
        data.SearchArticle3 = searchArticle3;

        var searchArticle4 = Mapper.Map<IEnumerable<SearchDataItemViewModel>>(_unitOfWork.Articles4.GetByString(search));
        data.SearchArticle4 = searchArticle4;

        int pageSize = 10;
        //return View("Search", Helpers.PaginatedList<SearchDataItemViewModel>.CreateAsync(data, page ?? 1, pageSize));
        //this is where I got an error
    }

我得到的错误是：

Argument 1: cannot convert from 'Website.ViewModels.SearchViewModel' to System.Linq.IQueryable< Website.ViewModels.SearchDataItemViewModel >

这也是我的一个查询示例：

    public IEnumerable<Article2> GetByString(string word)
    {
        IEnumerable<Article2> article2 = _appContext.Article2
            .Include(t => t.ParentPage)
            .Where(t => t.Status == RecordStatus.Enabled && (t.Name.Contains(word) || t.Description.Contains(word)));
        return article2;
    }

我其实明白这意味着什么，但是我怎样才能在视图上传递 "data" 变量以便我可以使用它？
我有点被困在这里，所以任何帮助的人都将不胜感激。至少给我指出正确的方向什么的。

感谢抽出时间！！！

Answer 1

在您的 Linq 语句中，您没有指定如何 Select 因此它返回一个 Linq 对象；而不是 Article2 对象；应如下所示：

  public IEnumerable<Article2> GetByString(string word)
{
    IEnumerable<Article2> article2 = _appContext.Article2
        .Include(t => t.ParentPage)
        .Where(t => t.Status == RecordStatus.Enabled && (t.Name.Contains(word) || t.Description.Contains(word))).ToList();
    return article2;
}

添加ToList()

Answer 2

已解决。我所做的是以这种方式修改控制器。

[HttpGet("search/{option?}/{search}")]
public  IActionResult GetSearchData(string option, string search, int? page, string currentFilter)
{
    if (search != null)
    {
        page = 1;
    }
    else
    {
        search = currentFilter;
    }
    SearchViewModel data = new SearchViewModel();
    int pageSize = 10;
    IEnumerable<SearchDataItemViewModel> searchArticle = Mapper.Map<IEnumerable<SearchDataItemViewModel>>(_unitOfWork.Articles.GetByString(search));
        var searchArticleP = Helpers.PaginatedList<SearchDataItemViewModel>.CreateAsync(searchArticle, page ?? 1, pageSize);
        data.SearchArticle = searchArticleP;

    IEnumerable<SearchDataItemViewModel> searchArticle2 = Mapper.Map<IEnumerable<SearchDataItemViewModel>>(_unitOfWork.Articles2.GetByString(search));
        var searchArticleP2 = Helpers.PaginatedList<SearchDataItemViewModel>.CreateAsync(searchArticle2, page ?? 1, pageSize);
        data.SearchArticle2 = searchArticleP2;
    return View("Search", data));
}

在 asp.net 核心中向剃刀视图添加分页

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