C# 如何为局部视图使用控制器？

我有下面的模型

我需要左上角的用户配置文件是动态加载的，所以我将navigation.cshtml分为两个文件

Navigation.cshtml

<nav class="navbar-default navbar-static-side" role="navigation">
    <div class="sidebar-collapse">
        <ul class="nav" id="side-menu">
            <li class="nav-header">
                <!-- Top Navbar -->
                @Html.Partial("_Profile")

            </li>
            <li class="@Html.IsSelected(action: "Index")">
                <a href="@Url.Action("Index", "Home")"><i class="fa fa-laptop"></i> <span class="nav-label">Main page</span> </a>
            </li>
            <li class="@Html.IsSelected(action: "Minor")">
                <a href="@Url.Action("Minor", "Home")"><i class="fa fa-desktop"></i> <span class="nav-label">Minor page</span></a>
            </li>
        </ul>
    </div>
</nav>

@Html.Partial（“_Profile”）

和profile.cshtml

<div class="dropdown profile-element">
    <span>
        <img alt="image" class="img-circle" src="~/Images/profile_small.jpg" />
    </span>
    <a data-toggle="dropdown" class="dropdown-toggle" href="#">
        <span class="clear">
            <span class="block m-t-xs">
                <strong class="font-bold">David Williams</strong>
            </span> <span class="text-muted text-xs block">Art Director <b class="caret"></b></span>
        </span>
    </a>
    <ul class="dropdown-menu animated fadeInRight m-t-xs">
        <li><a href="@Url.Action("Profile", "AppViews")">Profile</a></li>
        <li><a href="@Url.Action("Contacts", "AppViews")">Contacts</a></li>
        <li><a href="@Url.Action("Inbox", "Mailbox")">Mailbox</a></li>
        <li class="divider"></li>
        <li><a href="@Url.Action("Login", "Pages")">Logout</a></li>
    </ul>
</div>
<div class="logo-element">
    IN+
</div>

在+

我有一个控制器，它将返回用户的名称

 public class UserProfileController : Controller
    {
        // GET: UserProfile
        public async Task<ActionResult> GetPropertiesForUser()
        {
            Uri serviceRoot = new Uri(SettingsHelper.AzureAdGraphApiEndPoint);
            var token = await AppToken.GetAppTokenAsync();

            ActiveDirectoryClient adClient = new ActiveDirectoryClient(
             serviceRoot,
             async () => await AppToken.GetAppTokenAsync());
            string userObjectID = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;

            Microsoft.Azure.ActiveDirectory.GraphClient.Application app = (Microsoft.Azure.ActiveDirectory.GraphClient.Application)adClient.Applications.Where(
                a => a.AppId == SettingsHelper.ClientId).ExecuteSingleAsync().Result;
            if (app == null)
            {
                throw new ApplicationException("Unable to get a reference to application in Azure AD.");
            }

            string requestUrl = string.Format("https://graph.windows.net/{0}/users/{1}?api-version=1.5", SettingsHelper.Tenant,ClaimsPrincipal.Current.Identities.First().Name);

            HttpClient hc = new HttpClient();
            hc.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(
                "Bearer", token);

            HttpResponseMessage hrm = await hc.GetAsync(new Uri(requestUrl));

            if (hrm.IsSuccessStatusCode)
            {
                string jsonresult = await hrm.Content.ReadAsStringAsync();
                return View("GetPropertiesForUser", new UserProfile
                {
                    DisplayName = jsonresult //I am still missing here to get the display name only
                });
            }
            else
            {
                return View();
            }
        }

    }

公共类UserProfileController:控制器
{
//获取：UserProfile
公共异步任务




公共类UserProfileController:控制器
{
公共异步任务

局部视图名称称为_Profile.cshtml
，而不是使用Html。局部视图可以使用Html.Action或Html.RenderAction，指向控制器操作。类似于：

<div class="dropdown profile-element">
    <span>
        <img alt="image" class="img-circle" src="~/Images/profile_small.jpg" />
    </span>
    <a data-toggle="dropdown" class="dropdown-toggle" href="#">
        <span class="clear">
            <span class="block m-t-xs">
                <strong class="font-bold">David Williams</strong>
            </span> <span class="text-muted text-xs block">Art Director <b class="caret"></b></span>
        </span>
    </a>
    <ul class="dropdown-menu animated fadeInRight m-t-xs">
        <li><a href="@Url.Action("Profile", "AppViews")">Profile</a></li>
        <li><a href="@Url.Action("Contacts", "AppViews")">Contacts</a></li>
        <li><a href="@Url.Action("Inbox", "Mailbox")">Mailbox</a></li>
        <li class="divider"></li>
        <li><a href="@Url.Action("Login", "Pages")">Logout</a></li>
    </ul>
</div>
<div class="logo-element">
    IN+
</div>

        <li class="nav-header">
            <!-- Top Navbar -->
            @Html.Action("GetPropertiesForUser")

您可以使用Html.Action或Html.RenderAction来代替Html.Partial，指向控制器操作。类似于：

        <li class="nav-header">
            <!-- Top Navbar -->
            @Html.Action("GetPropertiesForUser")

实际上，您需要一个ChildAction和部分视图，因为您希望GetPropertiesForUser操作使用profile.cshtml视图

public class UserProfileController : Controller
{
   [ChildActionOnly]
   public ActionResult GetPropertiesForUser()
   {
      // ...
     return PartialView(...);
   }
}

用法
或

实际上，您需要一个ChildAction和部分视图，因为您希望GetPropertiesForUser操作使用profile.cshtml视图

public class UserProfileController : Controller
{
   [ChildActionOnly]
   public ActionResult GetPropertiesForUser()
   {
      // ...
     return PartialView(...);
   }
}

用法
或

我读到一些渲染操作会导致服务器出现2次错误，对吗？@EstebanV请提供一个链接-没有额外的往返来渲染子操作。注意-不清楚您是否读到了错误的链接，还是完全错误。这里是注释。我读到一些渲染操作会导致服务器出现2次错误，是吗正确吗？@EstebanV请提供一个链接-没有额外的往返来呈现子操作。注意-不清楚您是否读取了错误的链接或它只是完全错误。此处，在注释上。子操作不能是异步的…VNext支持异步视图组件，但语法不同。子操作不能是异步的…VNext support异步查看组件，但语法不同。
@{ Html.RenderAction("GetPropertiesForUser", "UserProfile"); }