AsP.Net MVC 5如何在视图中调用函数

我有ASP.Net MVC 5应用程序，我想从视图中调用方法该怎么做?

I have ASP.Net MVC 5 application I want to call a method from view how can I do it?

我的代码:

我的UsersList函数:

My UsersList function:

    public ActionResult UsersList()
    {

        var User_VM = new UserVM
        {
            MyUsers = context.Users.OrderBy(u => u.Email).Include(u => u.Roles).ToList()
        };

        return View(User_VM);

    }

UsersList视图:

UsersList View:

@foreach(var user in Model.MyUsers)
{
    <tr>
        <td>@user.Email</td>
        <td>
            @foreach(var r in user.Roles)
            {
                <p>
                    @Html.Action(GetRoleNameById(r.RoleId))
                </p>
            }
        </td>
    </tr>
}

和我在控制器中的功能:

and my function in controller:

   public ActionResult GetRoleNameById(string RoleId)
    {
        var RoleName = context.Roles.Where(r => r.Id == RoleId).FirstOrDefault();
        return Content(RoleName.ToString());
    }