Asp.net mvc 仅在SpecFlow测试期间重定向时TempData为空

我正在使用SpecFlow、Selenium和ChromeDriver测试一个.NETCore2.2Web应用程序，我被我遇到的一些事情弄糊涂了

我使用TempData在发布数据的页面和显示数据的页面之间传递警报消息的数据。在本地部署到IIS进行调试等时，我会看到TempData，直到它被使用并以格式化消息的形式显示在页面上。但是，我在SpecFlow场景中有一个步骤，当由于TempData为空而未显示警报时失败。SpecFlow场景遵循手动测试期间采取的相同步骤

我正在从一个引用的XUnit/Specflow测试项目测试一个.NETCore2.2Web项目。使用以下相关依赖项：

• Microsoft.NetCore.App v2.2.0
• SpecFlow v3.0.225
• SpecFlow.xUnit v3.0.225
• Selenium.WebDriver v3.141.0
• Selenium.WebDriver.ChromeDriver v76.0.3809.12600

我已经确认，在本地调试应用程序时，TempData按预期填充了消息数据。调试测试表明，TempData在表单数据成功过帐时填充，但在重定向期间处理生成的OnGet时为空

以下是用于添加帐户的post处理程序：

public async Task<IActionResult> OnPostAsync()
{
    if (ModelState.IsValid)
    {
        var user = new IdentityUser { UserName = Account.UserName, Email = Account.EmailAddress };
        var result = await _userManager.CreateAsync(user);

        if (result.Succeeded)
        {

            Dictionary<string, string> SuccessAlert = new Dictionary<string, string>()
            {
                { "Type", "success" },
                { "Title", "Account Added" },
                { "Text",  "Account for user " + Account.UserName + " was added successfully."}
            };

            TempData["Alert"] = SuccessAlert;

            _logger.LogInformation($"account added successfully. Alert title: {SuccessAlert["Title"]}");

            return RedirectToPage("/Accounts/Index", new
            {
                area = "Administration"
            });
        }

        foreach (var error in result.Errors)
        {
            ModelState.AddModelError("", error.Description);
        }

    }

    Dictionary<string, string> ErrorAlert = new Dictionary<string, string>()
            {
                { "Type", "error" },
                { "Title", "Uh-oh!" },
                { "Text",  "Account for user " + Account.UserName + " was not added. See errors below."}
            };

    TempData["Alert"] = ErrorAlert;

    return Page();
}

2019-08-28 16:18:53.917 -04:00 First.Web.Areas.Administration.Accounts.AddAccountModel [Information] account added successfully. Alert title: Account Added
2019-08-28 16:19:08.587 -04:00 First.Web.Areas.Administration.Accounts.AccountsIndexModel [Information] AccountsIndexModel.OnGet
2019-08-28 16:19:08.588 -04:00 First.Web.Areas.Administration.Accounts.AccountsIndexModel [Information] Items in TempData: 1

以下是与上述代码中的日志记录相对应的日志文件片段

手动添加帐户的日志：

public async Task<IActionResult> OnPostAsync()
{
    if (ModelState.IsValid)
    {
        var user = new IdentityUser { UserName = Account.UserName, Email = Account.EmailAddress };
        var result = await _userManager.CreateAsync(user);

        if (result.Succeeded)
        {

            Dictionary<string, string> SuccessAlert = new Dictionary<string, string>()
            {
                { "Type", "success" },
                { "Title", "Account Added" },
                { "Text",  "Account for user " + Account.UserName + " was added successfully."}
            };

            TempData["Alert"] = SuccessAlert;

            _logger.LogInformation($"account added successfully. Alert title: {SuccessAlert["Title"]}");

            return RedirectToPage("/Accounts/Index", new
            {
                area = "Administration"
            });
        }

        foreach (var error in result.Errors)
        {
            ModelState.AddModelError("", error.Description);
        }

    }

    Dictionary<string, string> ErrorAlert = new Dictionary<string, string>()
            {
                { "Type", "error" },
                { "Title", "Uh-oh!" },
                { "Text",  "Account for user " + Account.UserName + " was not added. See errors below."}
            };

    TempData["Alert"] = ErrorAlert;

    return Page();
}

2019-08-28 16:18:53.917 -04:00 First.Web.Areas.Administration.Accounts.AddAccountModel [Information] account added successfully. Alert title: Account Added
2019-08-28 16:19:08.587 -04:00 First.Web.Areas.Administration.Accounts.AccountsIndexModel [Information] AccountsIndexModel.OnGet
2019-08-28 16:19:08.588 -04:00 First.Web.Areas.Administration.Accounts.AccountsIndexModel [Information] Items in TempData: 1

对于SpecFlow自动测试：

2019-08-28 17:19:02.014 -04:00 First.Web.Areas.Administration.Accounts.AddAccountModel [Information] account added successfully. Alert title: Account Added
2019-08-28 17:19:02.105 -04:00 First.Web.Areas.Administration.Accounts.AccountsIndexModel [Information] AccountsIndexModel.OnGet
2019-08-28 17:19:02.105 -04:00 First.Web.Areas.Administration.Accounts.AccountsIndexModel [Information] Items in TempData: 0

以下是SpecFlow场景：

Scenario: Add new account succeeds
    Given I have access to the "Administration" module
    When I navigate to the "Add Account" page
        And I submit an account with values
            | accountname | emailaddress         |
            | mcullen     | mcullen@mnhockey.com |
    Then I should be on the "Accounts" page
        And I should see a success message with
            | title         | description      |
            | Account Added | Account for user |

以及帐户提交步骤的步骤定义：

[When(@"I submit an account with values")]
public void WhenISubmitAnAccountWithValues(Table table)
{
    var accountName = "";
    var emailAddress = "";

    var row = table.Rows[0];

    row.TryGetValue("accountname", out accountName);
    row.TryGetValue("emailaddress", out emailAddress);

    _accountsAddPage.AccountNameField.SendKeys(accountName);
    _accountsAddPage.EmailAddressField.SendKeys(emailAddress);

    _accountsIndexPage = _accountsAddPage.Submit();

    _context.Set<string>("Accounts", "currentpage");
}

[当（@“我提交一个有值的帐户”）]
当submitanaccountwithvalues（表）时公共无效
{
var accountName=“”；
var emailAddress=“”；
var row=表。行[0]；
行.TryGetValue（“accountname”，out accountname）；
row.TryGetValue（“emailaddress”，out emailaddress）；
_accountsAddPage.AccountNameField.SendKeys（accountName）；
_accountsAddPage.EmailAddressField.SendKeys（emailAddress）；
_accountsIndexPage=_AccountsAdPage.Submit（）；
_设置（“账户”、“当前页面”）；
}

在对我的问题进行更多故障排除时，我发现ChromeDriver打开的浏览器没有被发送到响应头中的.AspNetCore.Mvc.CookieTempDataProvider cookie

为了解决这个问题，我在Startup.cs中添加了以下配置：

services.Configure<CookieTempDataProviderOptions>(options =>
{
    options.Cookie.IsEssential = true;
});

services.Configure（选项=>
{
options.Cookie.IsEssential=true；
});

或者，您也可以省略上述代码，并将非必要cookie所需的检查代码更改为false：

services.Configure<CookiePolicyOptions>(options =>
{
    // This lambda determines whether user consent for non-essential cookies is needed for a given request.
    options.CheckConsentNeeded = context => false;
    options.MinimumSameSitePolicy = SameSiteMode.None;
});

services.Configure（选项=>
{
//此lambda确定给定请求是否需要非必要cookie的用户同意。
options.checkApprovered=context=>false；
options.MinimumSameSitePolicy=SameSiteMode.None；
});

---

这是基于找到的文档。因为我的项目是针对intranet站点的，所以我不使用CookiePolicyMiddleware，上面的解决方案是合适的。

您确定

\u accountsAdPage.Submit（）

方法正在提交您认为是的页面吗？您好，Greg。这是因为我调试了测试以查看它，并且数据库反映了提交的新数据。