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社区首页 >问答首页 >在使用ASP.NET MVC中的上下文编辑ASP.NET用户之后更新数据库

问在使用ASP.NET MVC中的上下文编辑ASP.NET用户之后更新数据库
EN

Stack Overflow用户
提问于 2019-12-06 15:59:28
回答 2查看 299关注 0票数 1

我很难将新数据持久化到数据库，因为我找不到合适的ApplicationDbContext方法。首先，让我向你们展示导致这一目标的步骤。下面的方法演示如何从Db中获取必要的字段，以填充Edit视图中的字段。

代码语言：javascript
运行
复制
 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，视图如下所示：

​

​

正确的。现在，如果我单击"Save"，这是应该将新数据传递给数据库的方法：

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

    }

在我所遵循的教程中，使用了context.Update --但是，在我的例子中，它说ApplicationDbContext没有一个名为Update的方法。此外，返回RedirectToAction也不起作用，因为

它不能将System.Web.Mvc.RedirectToRouteResult转换为Microsoft.AspNetCore.Mvc.IActionResult

如何编写后一种方法才能正常工作？

csproj信息：

代码语言：javascript
运行
复制
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c#
asp.net
asp.net-mvc
EN

Stack Overflow用户

发布于 2019-12-06 16:52:45

您正在将ORM生成的用户模型解析为一个自定义的viewModel，要求用户编辑它，然后期望您的DB上下文自动地将它转换回来并保存。对于如何将视图模型转换回模型，您的DB上下文没有自动的概念。它只是数据库上的抽象类映射。您必须自己显式地这样做，或者探索一些选项，比如自动映射器，以便将这两个类映射到一起。

关于高级对象的一个快速的未经测试的示例。

代码语言：javascript
运行
复制
[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);

}
票数 4
EN
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页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/59216479

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