c# - 即使在使用 TempData.Keep() asp.net core mvc 后也无法多次使用 TempData

问题描述

我有一个 mvc 项目，它将tempdata["username"] 在我的中间件中传递一个。但是在调试我的中间件时if(tempdata.ContainsKey("username")，我注意到它只进入了一次 if 语句，并且再也没有进入它。我阅读了这篇文章，它解释了如何使用TempData以及如何保持数据能够多次使用，但在我的情况下它不起作用。为了实现这一目标，我缺少什么东西吗？

在我的应用程序中，我有 4 个页面，在家庭控制器上，它会要求我输入用户名。当我这样做时，然后传递中间件中的临时数据并输入 if 语句。当继续使用 post 方法并在新页面上时，它不会保留任何值。所以基本上在第三次请求临时数据被删除。我该如何解决这个问题，以便它可以在我的所有页面中传递？

HomeController：

    public IActionResult Index()
    {
        // Gather IP

       var userip = Request.HttpContext.Connection.RemoteIpAddress;


        _logger.LogInformation("IP address of user logged in: {@IP-Address}", userip);

        // Call AddressService API

         var result = _addressServiceClient.SampleAsync().Result;
        _logger.Log(LogLevel.Information, "Home Page...");

        return View();
    }


        [HttpPost]
        public IActionResult AddressValidate(IFormCollection form)
        {
            // if radio button was checked, perform the following var request.

            // username

            username = form["UserName"];
            TempData["username"] = username;
            TempData.Keep("username");

            //HttpContext.Items["username"] = username;

            string status = form["Status"];

            _logger.LogInformation("Current user logged in: {@Username}", username);
          

            switch (status)
            {
                case "1":
                    _logger.LogInformation("Address entered was valid!");
                    break;
                case "2":
                    _logger.LogError("Address entered was invalid!");
                    ViewBag.Message = string.Format("You did not enter your address correctly! Please enter it again!");
                    return View("Index");
                case "3":
                    _logger.LogError("Invalid Address");
                    throw new Exception("Invalid Address");
                    
            }

            var request = new AddressRequest
            {

                StatusCode = Convert.ToInt32(status),
                Address = "2018 Main St New York City, NY, 10001"
            };


            var result = _addressServiceClient.ValidateAddress(request).Result;


            return RedirectToAction("SecIndex", "Second");
        }

middleware：

    public class CorrelationIdMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger _logger;
        private readonly ITempDataDictionaryFactory _tempDataDictionaryFactory;
        public CorrelationIdMiddleware(RequestDelegate next, ILoggerFactory loggerFactory, ITempDataDictionaryFactory tempDataDictionaryFactory)
        {
            _next = next;
            _logger = loggerFactory.CreateLogger<CorrelationIdMiddleware>();
            _tempDataDictionaryFactory = tempDataDictionaryFactory;
        }

        public async Task Invoke(HttpContext context)
        {
            string correlationId = null;
            string userName;
            var tempData = _tempDataDictionaryFactory.GetTempData(context);

            var key = context.Request.Headers.Keys.FirstOrDefault(n => n.ToLower().Equals("x-correlation-id"));
            if (!string.IsNullOrWhiteSpace(key))
            {
                correlationId = context.Request.Headers[key];
                _logger.LogInformation("Header contained CorrelationId: {@CorrelationId}", correlationId);
            }
            else
            {
                if (tempData.ContainsKey("username"))
                {
                    userName = tempData["username"].ToString();
                    context.Response.Headers.Append("X-username", userName);
                }

                correlationId = Guid.NewGuid().ToString();
                _logger.LogInformation("Generated new CorrelationId: {@CorrelationId}", correlationId);
            }
            context.Response.Headers.Append("x-correlation-id", correlationId);
            using (LogContext.PushProperty("CorrelationId", correlationId))
            {
                await _next.Invoke(context);
            }
        }
    }

标签： c#html.net-coreasp.net-core-mvcmiddleware

c# - 即使在使用 TempData.Keep() asp.net core mvc 后也无法多次使用 TempData

问题描述

解决方案

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