如何将当前过滤结果传递给锚，以便我可以生成一个基于该搜索输入的pdf？

Question

Asp.net核心mvc 3.1我有一个索引视图，它显示了一个电影列表，其中我添加了一个搜索文本框，我想知道是否有任何方法将该搜索值传递给锚元素。此锚元素指向生成pdf视图的操作。但是我想把搜索输入传递给一个锚，这样我就可以基于这个输入进行查询，并根据搜索到的输入生成不同的pdf结果.如果你们能帮我我会很感激的..。

MoviesController

    // GET: Movies
    public async Task<IActionResult> Index(string search)
    {
      
            var movies = _context.Movies.Include(m => m.Genre).OrderBy(m=>m.Name);
        if (!string.IsNullOrEmpty(search))
        {
            var query = _context.Movies.Include(m => m.Genre);
              var searchedItems = query.Where(m => m.Name.Contains(search) || m.Genre.Name.Contains(search) || m.Year.ToString().Contains(search));
            return View(await searchedItems.ToListAsync());
           
        }
        
            return View( await movies.ToListAsync());
        
    }

    public IActionResult GeneratePdf(string linkedSearch)
    {
        var movies = _context.Movies.Include(m => m.Genre).OrderBy(m => m.Name).ToList();
        return new ViewAsPdf("GeneratePdf", movies)
        {
            PageOrientation = Rotativa.AspNetCore.Options.Orientation.Portrait,
            PageSize = Rotativa.AspNetCore.Options.Size.A4
        };
       
    }

index.cshtml

@model IEnumerable<MovieListApp.Models.Movie>

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

<h1>Index</h1>

<p>
    <a asp-action="Create">Add new movie</a>
</p>
<a asp-action="Index">Refresh</a>
@* Table Omitted for brevity *@
<form asp-action="Index" asp-controller="Movies" method="get">
    <p>
        Search:<input type="text" name="search" placeholder="name, Genre, year" />
        <input type="submit" value="Filtrar" />
    </p>
</form>

<a asp-action="GeneratePdf" asp-controller="Movies">Generate Pdf</a>

搜索结果..。

解决方案值得一提的是，pdf视图是用ROTATIV1.2版本生成的，GeneratePdf操作方法链接到视图.MoviesContrller

// GET: Movies
        public async Task<IActionResult> Index(string search)
        {
            ViewData["Search"] = search;
                var movies = _context.Movies.Include(m => m.Genre).OrderBy(m=>m.Name);
            if (!string.IsNullOrEmpty(search))
            {
                var query = _context.Movies.Include(m => m.Genre);
                  var searchedItems = query.Where(m => m.Name.Contains(search) || m.Genre.Name.Contains(search) || m.Year.ToString().Contains(search));
                return View(await searchedItems.ToListAsync());
               
            }
            
                return View( await movies.ToListAsync());
            
        }

        public async Task<IActionResult> GeneratePdf(string linkedSearch)
        {
            
            var movies = _context.Movies.Include(m => m.Genre).OrderBy(m => m.Name);
            if (!string.IsNullOrEmpty(linkedSearch))
            {
                var query = _context.Movies.Include(m => m.Genre);
                var searchedItems = query.Where(m => m.Name.Contains(linkedSearch) || m.Genre.Name.Contains(linkedSearch) || m.Year.ToString().Contains(linkedSearch));

                return new ViewAsPdf("GeneratePdf",await searchedItems.ToListAsync())
                {
                    PageOrientation = Rotativa.AspNetCore.Options.Orientation.Portrait,
                    PageSize = Rotativa.AspNetCore.Options.Size.A4
                };
            }

            return new ViewAsPdf("GeneratePdf", await movies.ToListAsync())
            {
                PageOrientation = Rotativa.AspNetCore.Options.Orientation.Portrait,
                PageSize = Rotativa.AspNetCore.Options.Size.A4
            };
        }

Index.cshtml

@model IEnumerable<MovieListApp.Models.Movie>

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

<h1>Index</h1>

<p>
    <a asp-action="Create">Add new movie</a>
</p>
<a asp-action="Index">Refresh</a>
<form asp-action="Index" asp-controller="Movies" method="get">
    <p>
        Search:<input type="text" name="search" placeholder="name, Genre, year" />
        <input type="submit" value="Filtrar" />
    </p>
</form>
@{
    <table class="table">
        <thead>
            <tr>
                <th>
                    @Html.DisplayNameFor(model => model.Name)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Year)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Rating)
                </th>
                <th>
                    <label>Genre</label>>
                </th>
                <th></th>
            </tr>
        </thead>
        <tbody>
            @foreach (var item in Model)
            {
                <tr>
                    <td>
                        @Html.DisplayFor(modelItem => item.Name)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.Year)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.Rating)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.Genre.Name)
                    </td>
                    <td>
                        <a asp-action="Edit" asp-route-id="@item.MovieId">Edit</a> |
                        <a asp-action="Details" asp-route-id="@item.MovieId">Details</a> |
                        <a asp-action="Delete" asp-route-id="@item.MovieId">Delete</a>
                    </td>
                </tr>
            }
        </tbody>
    </table>

}
<a asp-action="GeneratePdf" asp-controller="Movies" asp-route-linkedSearch="@ViewData["Search"]">Generate Pdf</a>

基于search https://i.stack.imgur.com/wj75M.png的差分pdf

另一个pdf基于另一个搜索 https://i.stack.imgur.com/75MDV.png

Answer 1

锚标记助手支持使用asp-route-{value}属性传递查询参数。但是首先，您需要将搜索值传递给视图。为此，您可以使用ViewData字典。

public async Task<IActionResult> Index(string search)
{ 
    // pass the search string to the view so that the anchor can pass it to the GeneratePdf action
    ViewData["Search"] = search;
    
    // rest of the code
}

然后在视图中：

<a asp-action="GeneratePdf" asp-controller="Movies" asp-route-linkedSearch="@ViewData["Search"]">Generate Pdf</a>

https://learn.microsoft.com/en-us/aspnet/core/mvc/views/tag-helpers/built-in/anchor-tag-helper?view=aspnetcore-6.0#asp-route-value