c# - 在 ASP.NET MVC 中使用上下文编辑 ASP.NET 用户后更新数据库-6ren

c# - 在 ASP.NET MVC 中使用上下文编辑 ASP.NET 用户后更新数据库

转载作者：太空宇宙更新时间：2023-11-03 19:38:05

我正在努力将新数据持久保存到数据库中，因为我找不到合适的 ApplicationDbContext 方法。首先，让我向您展示导致这种情况的步骤。以下方法显示了如何从 Db 中获取必要的字段以填充编辑 View 中的字段。

 public ActionResult UsersWithRoles()
    {
        var usersWithRoles = (from user in context.Users
                              select new
                              {
                                  UserId = user.Id,
                                  Username = user.UserName,
                                  Email = user.Email,
                                  RoleNames = (from userRole in user.Roles
                                               join role in context.Roles on userRole.RoleId
                                               equals role.Id
                                               select role.Name).ToList()
                              }).ToList().Select(p => new UserViewModels()

                              {
                                  UserId = p.UserId,
                                  Username = p.Username,
                                  Email = p.Email,
                                  Role = string.Join(",", p.RoleNames)
                              });


        return View(usersWithRoles);
    }

这很好用， View 看起来像这样:

没错。现在，如果我单击“保存”，这就是应该将新数据传递到数据库的方法:

 [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Edit(UserViewModels user)
    {
        if (ModelState.IsValid)
        {
            context.Update(user);
            await context.SaveChangesAsync();
            return null;
        }
        return null;

    }

在我遵循的教程中，使用了 context.Update - 但是，在我的例子中，它说 ApplicationDbContext 没有名为 的方法>更新。此外，返回 RedirectToAction 不起作用，因为

it can not convert System.Web.Mvc.RedirectToRouteResult to Microsoft.AspNetCore.Mvc.IActionResult

后面的方法应该怎么写才能正常工作？

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    <Content Include="Scripts\src\utils\setAttributes.js" />
    <Content Include="Scripts\src\utils\setStyles.js" />
    <Content Include="Scripts\src\utils\setupEventListeners.js" />
    <Content Include="Scripts\umd\popper-utils.js" />
    <Content Include="Scripts\umd\popper-utils.min.js" />
    <Content Include="Scripts\umd\popper.js" />
    <Content Include="Scripts\umd\popper.min.js" />
    <Content Include="Web.config" />
    <Content Include="Web.Debug.config">
      <DependentUpon>Web.config</DependentUpon>
    </Content>
    <Content Include="Web.Release.config">
      <DependentUpon>Web.config</DependentUpon>
    </Content>
    <Content Include="Views\Web.config" />
    <Content Include="Views\_ViewStart.cshtml" />
    <Content Include="Views\Shared\Error.cshtml" />
    <Content Include="Views\Shared\_Layout.cshtml" />
    <Content Include="Views\Home\About.cshtml" />
    <Content Include="Views\Home\Contact.cshtml" />
    <Content Include="Views\Home\Index.cshtml" />
    <Content Include="Views\Account\_ExternalLoginsListPartial.cshtml" />
    <Content Include="Views\Account\ConfirmEmail.cshtml" />
    <Content Include="Views\Account\ExternalLoginConfirmation.cshtml" />
    <Content Include="Views\Account\ExternalLoginFailure.cshtml" />
    <Content Include="Views\Account\ForgotPassword.cshtml" />
    <Content Include="Views\Account\ForgotPasswordConfirmation.cshtml" />
    <Content Include="Views\Account\Login.cshtml" />
    <Content Include="Views\Account\Register.cshtml" />
    <Content Include="Views\Account\ResetPassword.cshtml" />
    <Content Include="Views\Account\ResetPasswordConfirmation.cshtml" />
    <Content Include="Views\Account\SendCode.cshtml" />
    <Content Include="Views\Account\VerifyCode.cshtml" />
    <Content Include="Views\Manage\AddPhoneNumber.cshtml" />
    <Content Include="Views\Manage\ChangePassword.cshtml" />
    <Content Include="Views\Manage\Index.cshtml" />
    <Content Include="Views\Manage\ManageLogins.cshtml" />
    <Content Include="Views\Manage\SetPassword.cshtml" />
    <Content Include="Views\Manage\VerifyPhoneNumber.cshtml" />
    <Content Include="Views\Shared\Lockout.cshtml" />
    <Content Include="Views\Shared\_LoginPartial.cshtml" />
    <Content Include="Scripts\umd\popper.min.js.map" />
    <Content Include="Scripts\umd\popper.js.map" />
    <Content Include="Scripts\umd\popper.js.flow" />
    <Content Include="Scripts\umd\popper-utils.min.js.map" />
    <Content Include="Scripts\umd\popper-utils.js.map" />
    <Content Include="Scripts\README.md" />
    <Content Include="Scripts\popper.min.js.map" />
    <Content Include="Scripts\popper.js.map" />
    <Content Include="Scripts\popper-utils.min.js.map" />
    <Content Include="Scripts\popper-utils.js.map" />
    <Content Include="Views\ManageUsers\UsersWithRoles.cshtml" />
    <Content Include="Views\ManageUsers\Edit.cshtml" />
    <Content Include="Views\ManageUsers\CreateUser.cshtml" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="App_Data\" />
  </ItemGroup>
  <ItemGroup>

最佳答案

您正在将 ORM 生成的用户模型解析为自定义的 viewModel，要求用户对其进行编辑，然后期望您的数据库上下文自动将其转换回来并保存。您的数据库上下文没有关于如何将 View 模型转换回模型的自动概念。它只是一个抽象类映射到您的数据库。您必须自己明确地执行此操作或探索诸如自动映射器之类的选项以将两个类映射在一起。

关于您的高级对象的快速未经测试的示例

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(UserViewModels user)
{
    if (ModelState.IsValid)
    {

      var u = context.Users.where(a => a.Id == UserId).FirstOrDefault();
      if(u != null)
      {
        u.UserName = user.UserName
        so on.....
        await context.SaveChangesAsync();
        return RedirectToAction("CompleteActionName");
      }

        return RedirectToAction("UserNotFound", user);
    }
    return View(user);

}

关于c# - 在 ASP.NET MVC 中使用上下文编辑 ASP.NET 用户后更新数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59216479/

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c# - 在 ASP.NET MVC 中使用上下文编辑 ASP.NET 用户后更新数据库