asp.net-mvc - RouteValueDictonary routeValues 在 Html.BeginForm() 中有什么用

Question

@{
    ViewBag.Title = "About Us";
}

@using (Html.BeginForm(new RouteValueDictionary { {"Action","Index"}}))
{
<input type="submit" value="submit"/>
}

当我渲染

<form action="/Home/Index" method="post"><input type="submit" value="submit"/>

这是 RouteValueDictonary 的实际使用吗？如果是这样，我可以通过 HTML.BeginForm("About","Home") 做到这一点

有人可以解释一下RouteValueDictonary的实际用途吗？
任何帮助将不胜感激。

Answer 1

这在实现 ActionFilterAttribute 时也很有用。用于重定向目的。这个类的基本用法是定义Action姓名，Controller姓名和 Area姓名

public class MyActionFilter : ActionFilterAttribute
{
    public override void OnResultExecuting(ResultExecutingContext filtercontext)
    {
        filtercontext.Result = new RedirectToRouteResult
            (
                new RouteValueDictionary
                    (
                        new
                        {
                            controller = "ControllerName",
                            action = "ActionName",
                            area = "AreaName"
                        }
                    )
            );
        base.OnResultExecuting(filtercontext);
    }
}

您还可以发送如下所示的参数列表..

filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary
                        {
                            {"action", "ActionName"},
                            {"controller", "ControllerName"},
                            {"area", "Area Name"},
                            {"Parameter Name","Parameter Value"}
                        });