C# 如何将单选按钮绑定到控制器，以便动态呈现getRequest字符串？

我创建了单选按钮，该按钮将生成值“True”，该值稍后将传递给我创建的API

我现在想知道如何在我的项目设置中绑定视图和控制器：ASP.NET MVC（Umbraco）

@using (Html.BeginUmbracoForm("Index", "SokSurface", FormMethod.Get)) [...]

<div class="audiencefilter" style="display:flex;">

    <p>Målgrupp&nbsp;&nbsp;</p>
    <ul class="list-group list-group-horizontal">

        <li class="list-group-item btn btn-outline-primary">
            <input type="radio" id="allaudience" name="audience" checked="checked" value="true" />
            <label for="allaudience">Alla</label>
        </li>
        <li class="list-group-item btn btn-outline-primary">
            <input type="radio" id="juvenile" name="audience" value="true" />
            <label for="juvenile">Barn och ungdom</label>
        </li>
        <li class="list-group-item btn btn-outline-primary">
            <input type="radio" id="student" name="audience" value="true" />
            <label for="student">Student</label>
        </li>
        <li class="list-group-item btn btn-outline-primary">
            <input type="radio" id="adult" name="audience" value="true" />
            <label for="adult">Vuxna</label>
        </li>
    </ul>

</div>

<button type="submit" class="btn btn-outline-primary">Submit</Button>

public ActionResult Index(ContentModel model, string searchText)
{
    if (string.IsNullOrWhiteSpace(searchText))
        return View("Sok", new SokViewModel());

    string cleanSearchText = Regex.Replace(searchText, @"[^\w\s]", "").ToLower();

    FormCollection frm = new FormCollection();
    string audienceRadio = frm["audience"].ToString();
    string formatRadio = frm["format"].ToString();

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