6、vs2022_使用基架自动创建控制器和视图

 1、添加控制器

右键Controllers文件夹，选择添加使用EF的MVC控制器

 选择模型类和数据上下文

 自动生成的Controller，包含增删查改

  public class LoginController : Controller
    {
        private readonly DemoDbContext _context;

        public LoginController(DemoDbContext context)
        {
            _context = context;
        }

        public async Task<IActionResult> Index()
        {
              return View(await _context.logins.ToListAsync());
        }

        public async Task<IActionResult> Details(string id)
        {
            if (id == null || _context.logins == null)
            {
                return NotFound();
            }

            var login = await _context.logins.FirstOrDefaultAsync(m => m.loginId == id);
            if (login == null)
            {
                return NotFound();
            }

            return View(login);
        }

        public IActionResult Create()
        {
            return View();
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Create([Bind("loginId,loginPwd")] Login login)
        {
            if (ModelState.IsValid)
            {
                _context.Add(login);
                await _context.SaveChangesAsync();
                return RedirectToAction(nameof(Index));
            }
            return View(login);
        }

        public async Task<IActionResult> Edit(string id)
        {
            if (id == null || _context.logins == null)
            {
                return NotFound();
            }

            var login = await _context.logins.FindAsync(id);
            if (login == null)
            {
                return NotFound();
            }
            return View(login);
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Edit(string id, [Bind("loginId,loginPwd")] Login login)
        {
            if (id != login.loginId)
            {
                return NotFound();
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(login);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!LoginExists(login.loginId))
                    {
                        return NotFound();
                    }
                    else
                    {
                        throw;
                    }
                }
                return RedirectToAction(nameof(Index));
            }
            return View(login);
        }

        public async Task<IActionResult> Delete(string id)
        {
            if (id == null || _context.logins == null)
            {
                return NotFound();
            }

            var login = await _context.logins
                .FirstOrDefaultAsync(m => m.loginId == id);
            if (login == null)
            {
                return NotFound();
            }

            return View(login);
        }

        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> DeleteConfirmed(string id)
        {
            if (_context.logins == null)
            {
                return Problem("Entity set 'DemoDbContext.logins'  is null.");
            }
            var login = await _context.logins.FindAsync(id);
            if (login != null)
            {
                _context.logins.Remove(login);
            }
            
            await _context.SaveChangesAsync();
            return RedirectToAction(nameof(Index));
        }

        private bool LoginExists(string id)
        {
          return _context.logins.Any(e => e.loginId == id);
        }
    }

 自动生成的对应的视图文件

Index.cshtml

@model IEnumerable<Web_DEMO.Models.Login>

@{
    ViewData["Title"] = "Index";
}

<p>
    <a asp-action="Create">创建</a>
</p>
<table class="table">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.loginId)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.loginPwd)
            </th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.loginId)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.loginPwd)
                </td>
                <td>
                    <a asp-action="Edit" asp-route-id="@item.loginId">修改</a> |
                    <a asp-action="Details" asp-route-id="@item.loginId">明细</a> |
                    <a asp-action="Delete" asp-route-id="@item.loginId">删除</a>
                </td>
            </tr>
        }
    </tbody>
</table>

Create.cshtml

@model Web_DEMO.Models.Login

@{
    ViewData["Title"] = "Create";
}
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="Create">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="loginId" class="control-label"></label>
                <input asp-for="loginId" class="form-control" />
                <span asp-validation-for="loginId" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="loginPwd" class="control-label"></label>
                <input asp-for="loginPwd" class="form-control" />
                <span asp-validation-for="loginPwd" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

Edit.cshtml

@model Web_DEMO.Models.Login

@{
    ViewData["Title"] = "Edit";
}

<div class="row">
    <div class="col-md-4">
        <form asp-action="Edit">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <input type="hidden" asp-for="loginId" />
            <div class="form-group">
                <label asp-for="loginPwd" class="control-label"></label>
                <input asp-for="loginPwd" class="form-control" />
                <span asp-validation-for="loginPwd" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Save" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

Details.cshtml

@model Web_DEMO.Models.Login

@{
    ViewData["Title"] = "Details";
}

<h1>Details</h1>

<div>
    <h4>Login</h4>
    <hr />
    <dl class="row">
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.loginId)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.loginId)
        </dd>
    </dl>
        <dl class="row">
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.loginPwd)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.loginPwd)
        </dd>
    </dl>
</div>
<div>
    <a asp-action="Edit" asp-route-id="@Model?.loginId">Edit</a> |
    <a asp-action="Index">Back to List</a>
</div>

Delete.cshtml

@model Web_DEMO.Models.Login

@{
    ViewData["Title"] = "Details";
}

<h1>Details</h1>

<div>
    <h4>Login</h4>
    <hr />
    <dl class="row">
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.loginId)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.loginId)
        </dd>
    </dl>
        <dl class="row">
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.loginPwd)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.loginPwd)
        </dd>
    </dl>
</div>
<div>
    <a asp-action="Edit" asp-route-id="@Model?.loginId">Edit</a> |
    <a asp-action="Index">Back to List</a>
</div>