如何通过锚标记帮助器传递值数组？ [英] How Do I Pass an Array of Values via Anchor Tag Helper?

问题描述

我正在使用 Asp.Net Core 2.1 页面

public async Task OnGetAsync([FromQuery(Name = "status")] string[] myValues)
{

}

我正试图从锚标签帮助程序中传递一系列值，但是我在 myValues 中收到的只是一项。如果我手动键入查询字符串以镜像 MyRoute？myValues = A& myValues = B ，它将按预期工作。我尝试了以下操作，但没有成功。

I'm trying to pass in an array of values from an anchor tag helper, but all I receive in myValues is one item. If I manually type out the query string to mirror MyRoute?myValues=A&myValues=B, it works as expected. I've tried the following with no success.

<a asp-page="/MyPage" asp-route-status="A" asp-route-status="B">Click</a>

<a asp-page="/MyPage" asp-route-status="new [] { A, B }">Click</a>

<a asp-page="/MyPage" asp-route-status="@(new [] { A, B })">Click</a>

@{  var list = new string[] { "A", "B" };}
<a asp-page="/MyPage" asp-route-status="@list">Click</a>

推荐答案

这似乎不可能-值传递给 asp-route-status 的值应该是字符串或值，然后无论如何都将其转换为字符串。您可以在源代码，其中 RouteValues 属性是< string，string> 的字典。

This doesn't appear to be possible - The value passed in to asp-route-status is expected to either be a string or a value that it is then converted to a string anyway. You can see this in the source code, where the RouteValues property is a dictionary of <string, string>.

我们来看第一个示例，如下所示：

Let's look at your first example, which looks like this:

<a asp-page="/MyPage" asp-route-status="A" asp-route-status="B">Click</a>

我正在使用Visual Studio及其所有的智能知识-当我使用此代码段时，我是通过绿色的波浪状和工具提示警告属性'asp-route-status'已经存在。 。最终结果是，实际上只有指定的第一个值才传递到查询字符串中。

I'm using Visual Studio with all its intellisense magic - when I use this code snippet, I am warned via a green squiggly and tooltip that the "Attribute 'asp-route-status' already exists.". The end result here is that only the first value specified is actually passed into the query-string.

使用任一有效数组方法，生成的<$ c值$ c> status 只是数组 System.String％5B％5D 的 ToString 。

With either of your valid array approaches, the generated value for status is simply a ToString of the array - System.String%5B%5D.

似乎要实现您想要的目标，您将需要使用传统的 UrlHelper 方法。看起来像这样：

It appears that in order to achieve what you want, you're going to need to fallback to the traditional UrlHelper approach. Here's what that looks like:

<a href="@Url.Page("/MyPage", new { status = new [] { "A", "B" } })">Click</a>

我发现此 Github问题，最近的评论（2017-11-24）询问如何使用标签帮助程序实现此功能，但至今尚未回答该问题（2018-08-10）。

I found this Github issue where the most recent comment (2017-11-24) asks about how to achieve this with a tag-helper, but the question has not been answered as of today (2018-08-10).

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