输入类型文本的相同名称和隐藏的输入类型

Question

我正在研究一本mvc书，它显示了搜索按钮的工作原理，它使用相同的名称输入类型文本和输入类型隐藏，我的问题是控制器中的操作如何理解提交时必须使用哪个搜索参数当我们有相同的名字＆＃34;搜索＆＃34;用于文本框和隐藏字段

搜索文本框位于＆＃34; _Layout.cshtml＆＃34;

   @using (Html.BeginForm("Index", "Products", FormMethod.Get, new { @class = "navbar-form navbar-left" }))
            {
                <div class="form-group">
                    @Html.TextBox("Search", null, new { @class = "form-control", @placeholder = "Search Products" })
                </div>
                <button type="submit" class="btn btn-default">Submit</button>
            }

和隐藏字段位于＆＃34; Index.cshtml＆＃34;

   @using (Html.BeginForm("Index", "Products", FormMethod.Get))
{
    <label>Filter by category:</label>
    @Html.DropDownListFor(vm => vm.Category, Model.CatFilterItems, "All");
    <input type="submit" value="Filter" />
    <input type="hidden" name="Search" id="Search" value="@Model.Search" />
}

获取参数的动作索引如下所示：

   public ActionResult Index(string category, string search)
    {
        //instantiate a new view model
        ProductIndexViewModel viewModel = new ProductIndexViewModel();

        //select the products
        var products = db.Products.Include(p => p.Category);

        //perform the search and save the search string to the viewModel
        if (!String.IsNullOrEmpty(search))
        {
            products = products.Where(p => p.Name.Contains(search) ||
            p.Description.Contains(search) ||
            p.Category.Name.Contains(search));
            viewModel.Search = search;
        }

        //group search results into categories and count how many items in each category
        viewModel.CatsWithCount = from matchingProducts in products
                                  where
                                  matchingProducts.CategoryID != null
                                  group matchingProducts by
           matchingProducts.Category.Name into
                                  catGroup
                                  select new CategoryWithCount()
                                  {
                                      CategoryName = catGroup.Key,
                                      ProductCount = catGroup.Count()
                                  };

        if (!String.IsNullOrEmpty(category))
        {
            products = products.Where(p => p.Category.Name == category);
        }

        viewModel.Products = products;
        return View(viewModel);
    }

取值