我如何为路由添加整数列表

var routeData = new RouteValueDictionary();

for (int i = 0; i < Model.GroupsId.Length; i++) {
    routeData.Add(\"GroupsId[\" + i + \"]\", Model.GroupsId[i]);
}

Url.Action(\"Index\", routeData)

GroupsId%5B0%5D=1213&GroupsId%5B0%5D=1214

GroupsId=1213&GroupsId=1214

var baseUrl = Url.Action(\"Index\", \"SomeController\", null, Request.Url.Scheme);
var uriBuilder = new UriBuilder(baseUrl);
uriBuilder.Query = string.Join(\"&\", Model.GroupsId.Select(x => \"groupsid=\" + x));
string url = uriBuilder.ToString();