在Form Post之后使用更改的ViewModel更新视图

Question

我正在尝试更新MVC视图，以便在表单发布后显示消息，但无法使其正常工作。我是新手，所以我会欣赏一些关于我做错的几点建议。这不是表单验证，因为在表单发布和处理之后才会知道逻辑和响应消息。

控制器操作[HttpPost] public async Task<IActionResult> PlatformRecord(RecAction RecActionNotUSed)在Form POST上触发并执行一些代码隐藏逻辑 - 然后我需要使用Response更新View，这只是一个临时消息而不是存储在任何地方。

初始GET请求正常工作并显示消息，但在表单POST后无法弄清楚如何执行相同操作。

我尝试添加ModelState.Clear();但没有成功。此外，如果我重定向到初始视图，我会丢失响应消息，例如return RedirectToAction("PlatformRecord");表示我不再拥有RecAction.Response = "NEED TO SHOW THIS RESPOSNE MESSAGE AFTER FORM POST.";

我的代码如下

视图模型：

public class RecAction
{
    public RecUser RecUser { get; set; }
    public string Response { get; set; }
}

控制器：

public class RecordManagerController : Controller
{

    private readonly IOptions<ConnectionStrings> _connectionStrings;
    private readonly UserManager<AppRecationUser> _userManager;
    Public RecordManagerController(UserManager <AppRecationUser> UserManager, 
                                   IOptions <connectionStrings> connectionStrings)
    {
        _userManager = userManager;
        _connectionStrings = connectionStrings;
    }

    // GET: /<controller>/
    public IActionResult Index()
    {
        return View();
    }

    private Task<AppRecationUser> GetCurrentUserAsync()
    {
        return _userManager.GetUserAsync(HttpContext.User);
    }

    public async Task<IActionResult> PlatformRecord()
    {
        var RecordDataModel = new RecordDataModel(_connectionStrings.Value.DefaultConnection);
        var user = await GetCurrentUserAsync();
        RecAction RecAction = new RecAction();
        RecAction.RecUser = RecordDataModel.GetRecord(user.Email, "Platform");

        if (RecAction.RecUser.Record == null)
        {
            //Response Successfully Displayed
            RecAction.Response = "No Record found";
        }

        return View(RecAction);
    }


    [HttpPost]
    public async Task<IActionResult> PlatformRecord(RecAction RecActionNotUSed)
    {
        try
        {
            if (ModelState.IsValid)
            {
                var RecordDataModel = new RecordDataModel(_connectionStrings.Value.DefaultConnection);
                var user = await GetCurrentUserAsync();
                RecAction RecAction = new RecAction();
                RecAction.RecUser = RecordDataModel.GetRecord(user.Email, "Platform");
                RecSettings latestSettings = RecordDataModel.GetSettings();

                RecKeys RecKeys = RecordDataModel.GetKey();
                if (RecKeys.PrivateKey == null)
                {
                    ModelState.Clear();

                    //Rsponse not updating
                    RecAction.Response = "NEED TO SHOW THIS RESPOSNE MESSAGE AFTER FORM POST.";
                    return View(RecAction);
                }


                return RedirectToAction("PlatformRecord");
            }
            Else
            {
                //Need to return the same view for errors so the validation is not overwritten.
                return View();
            }

        }
        catch
        {
            // If we got this far, something failed, redisplay form
            return RedirectToAction("PlatformRecord");
        }
    }


}

查看：

@model ProjectXYZ.Models.RecordModels.RecAction
@{
    ViewData["Title"] = "PlatformRecord";
}

<h2>Platform Record</h2>

<form asp-controller="RecordManager" asp-action="PlatformRecord" asp-route-returnurl="@ViewData["ReturnUrl"]" method="post" class="form-horizontal" autocomplete="off">
    <p></p>
    <hr />
    <div class="form-group">
        <label asp-for="RecUser.Record" class="col-md-2 control-label"></label>
        <div class="col-md-10">
            <textarea asp-for="RecUser.Record" class="form-control" cols="1" rows="8" readonly></textarea>
        </div>
    </div>
    <div class="form-group">
        <label  class="col-md-2 control-label"></label>
        <div class="col-md-10">
            <input asp-for="Response" class="text-danger" readonly/>
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <button type="submit" class="btn btn-default">Request New Record</button>
        </div>
    </div>


</form>