ASP.NET核心5移动虚电路-精选元素中的会话存储，带选件

Question

我想在我的select中添加Sesson Storage with options。我有4个选择。无论用户选择什么，我都希望该选择在当前会话中持续存在，或者直到用户再次更改该选项。

下面是我的控制器操作

public IActionResult Index(string sortOrder, string filterString)
        {
            //These lines of code creates the filtering for all the types
            ViewData["TypeSortParm"] = String.IsNullOrEmpty(sortOrder) ? "types" : "";
            ViewData["CurrentFilter"] = filterString;
            var types = from t in _context.LibraryItems
                        select t;
            if (!String.IsNullOrEmpty(filterString))
            {
                types = types.Where(t => t.Type.Contains(filterString));
            }

            switch (sortOrder)
            {
                case "types":
                    types = types.OrderByDescending(s => s.Type);
                    break;
                default:
                    types = types.OrderBy(s => s.Category);
                    break;
            }

            var libs = _context.LibraryItems.Include(c => c.Category).ToList();

            var viewModel = new CatagoriesAndLibraryViewModel
            {
                Categories = _context.Categories.ToList(),
                LibraryItems = (filterString != null) ? libs.Where(x => x.Type == filterString).ToList() : libs
            };

            return View(viewModel);
        }

这将添加一个过滤器函数。本节将过滤不同类型的对象。

这是我的剃刀页面

<form asp-action="Index" method="get">
    <div>
        <p>
            Find by Type: <select type="text" name="filterString" value="@ViewData["CurrentFilter"]" class="custom-select">
                <option selected>Select a type</option>
                <option value="Book">Book</option>
                <option value="AudioBook">AudioBook</option>
                <option value="ReferenceBook">Reference Book</option>
                <option value="DVD">DVD</option>
            </select>
            <hr />
            <input type="submit" value="Filter" class="btn btn-outline-success" /> |
            <a asp-action="Index" class="btn btn-outline-dark">Back to full list</a>
        </p>
    </div>
</form>

我如何才能使用户的类型选择在会话期间保持不变？

Answer 1

ConfigureServices中的AddSession。

services.AddDistributedMemoryCache();
services.AddSession(options =>
{
    options.IdleTimeout = TimeSpan.FromSeconds(10);
    options.Cookie.HttpOnly = true;
    options.Cookie.IsEssential = true;
});

配置中的UseSession。

app.UseSession();

有关更多详细信息，请参阅doc。