在asp网络核心中获取ViewContext

Question

我在.NET 4.6中有一个像这样的HTML扩展名

public static string IsSelected( this HtmlHelper html, string controller = null, string action = null, string area = null ) {
    string cssClass = "active";
    string currentAction = (string)html.ViewContext.RouteData.Values[ "action" ];
    string currentController = (string)html.ViewContext.RouteData.Values[ "controller" ];
    string currentArea = html.ViewContext.RouteData.DataTokens[ "area" ] == null ? String.Empty : (string)html.ViewContext.RouteData.DataTokens[ "area" ];
    if ( String.IsNullOrEmpty( controller ) )
        controller = currentController;
    if ( String.IsNullOrEmpty( action ) )
        action = currentAction;
    if ( String.IsNullOrEmpty( area ) )
        area = currentArea;
    if ( controller.ToLower() == currentController.ToLower() && action.ToLower() == currentAction.ToLower() && area == currentArea ) {
        return cssClass;
    }
    else {
        return string.Empty;
    }
}

通过这个帮助程序，我能够在剃刀视图中编写这样的代码：

<li class="treeview @Html.IsSelected( controller: "mycontroller", action : string.Empty, area : string.Empty )">
    <a href="#">
        <i class="fa fa-list-alt"></i> <span>Menu 1</span>
        <span class="pull-right-container">
            <i class="fa fa-angle-right pull-right"></i>
        </span>
    </a>
    <ul class="treeview-menu">
        <li class="@Html.IsSelected( controller: "mycontroller", action : "myaction", area : string.Empty )">
            <a href="@Url.Action("myaction", "mycontroller" )">
                <i class="fa fa-retweet"></i>
                My Action &nbsp;
            </a>
        </li>
    </ul>
</li>

如何将此帮助程序转换为与 .NET Core 一起使用？我已经尝试使用IHtmlContent但我无法获得ViewContext.唯一的方法是标签助手？

Answer 1

也许很晚，但你可以通过以下方式获得它：

this.ViewContext

当您在 CSHTML 文件中时