Question

在我的表单中，我已经尝试设置id = Model.SearchTerm，但是当我转到表单页面时它没有工作＆＃34;对象引用未设置为实例一个对象。＆＃34;这是有道理的，因为用户还没有输入搜索词。

例如，在我们的设施页面上，我们有多种方法可以找到设施。在这种情况下，当您按邮政编码进行搜索时，您会将网址设为http://localhost:50264/Facilities/SearchByZipCode。

以下表格：

@if (@ViewBag.ZipCodeSerachError != null)
{
    @ViewBag.ZipCodeSerachError
}
@using (Html.BeginForm("SearchByZipCode", "Facilities", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
    @Html.LabelFor(m => m.SearchTerm, "5 Digit Zip Code:")

    @Html.TextBoxFor(m => m.SearchTerm, new { @class = "form-control", maxlength = 5, id = "zipCodeSearch" })
    <br />
    @Html.LabelFor(m => m.Distance, "List facilities within:")

    @Html.DropDownList("Distance", ViewBag.ZipCodeDistanceList as IEnumerable<SelectListItem>, new { @class = "form-control" })
    <br />
    <button type="submit" class="btn btn-default">Search</button>
}

发布时，您会收到以下ActionResult：

[HttpPost]
public ActionResult SearchByZipCode(FacilitiesSearchViewModel.FacilitiesByZipCode vm)
{
    var zipCode = oandpService.GetZipCodes().FirstOrDefault(x => x.ZipCodeId == vm.SearchTerm);

    var facilities = new List<Facility>();

    if (zipCode == null)
    {
        ViewBag.ZipCodeSerachError = "An Invalid or Unknown US Zip Code was Entered!";
        facilities = new List<Facility>();
    }
    else
    {
        var zipCodeId = oandpService.GetZipCode(vm.SearchTerm);
        var zipCodes = oandpService.GetZipCodesByDistance(string.Format("{0} {1}", zipCodeId.ZipLongitude, zipCodeId.ZipLatitude), vm.Distance.GetValueOrDefault(0)).Select(x=> new ZipCodeWithDistance() { ZipCode = x.ZipCode, ZipLatitude = x.ZipLatitude, ZipLongitude = x.ZipLongitude, Distance = x.Distance}).ToList();

        facilities = oandpService.GetFacilitiesByZipCodes(zipCodes).OrderByDescending(x=>x.IsFeatured).ThenBy(x=>x.Name).ToList();
    }
    var results = new FacilitiesSearchViewModel.FacilitiesByZipCode
    {
        SearchTerm = vm.SearchTerm,
        Distance = vm.Distance,
        Facilities = facilities
    };

    return View("SearchByZipCode", results);
}

所以，问题是，如果有人搜索工具，我该如何制作呢？它会生成网址http://localhost:50264/Facilities/SearchByZipCode?Distance=50&ZipCode=32608

我想完成这项工作主要是因为我想让我们的SiteMap捕获SearchByZipCode，其中protectedRouteParameters等于＆＃34;距离，邮政编码＆＃34;。

感谢您的帮助。如果您需要更多信息，请告诉我们。

Answer 1

对于http://localhost:50264/Facilities/SearchByZipCode?Distance=50&ZipCode=32608，您需要 HttpGet 。

最简单的方法是使用distance和zipCode参数创建另一个方法重载。

[HttpGet]
public ActionResult SearchByZipCode(string distance, string zipCode)
{
   ...
}

Answer 2

你的需求url就像基于HttpGet（如querystring）

所以你需要在控制器中将你的方法设为HttpGet。

MVC 5 Html.BeginForm包含URL中的值

2 个答案: