Asp.net mvc 4 从数据库中的表生成dropdownlist
我试图更精确地回答我的前一个问题,可以在这里找到,我得到了一些很好的答案,但不知道如何在我的情况下使用它 我得到了一些很好的答案,但不知道如何在我的情况下使用它 基本上我想有一个注册页面,其中包含Asp.net mvc 4 从数据库中的表生成dropdownlist,asp.net-mvc-4,drop-down-menu,model,controller,html.dropdownlistfor,Asp.net Mvc 4,Drop Down Menu,Model,Controller,Html.dropdownlistfor,我试图更精确地回答我的前一个问题,可以在这里找到,我得到了一些很好的答案,但不知道如何在我的情况下使用它 我得到了一些很好的答案,但不知道如何在我的情况下使用它 基本上我想有一个注册页面,其中包含 Email//来自我的AspNetUser(datamodel)类,数据库中也存在AspNetUsers表 UserName//来自我的AspNetUser(datamodel)类,数据库中也存在AspNetUsers表 Password//来自我的AspNetUser(datamodel)类,数据库
Email
//来自我的AspNetUser(datamodel)类,数据库中也存在AspNetUsers表UserName
//来自我的AspNetUser(datamodel)类,数据库中也存在AspNetUsers表Password
//来自我的AspNetUser(datamodel)类,数据库中也存在AspNetUsers表Role
//dropdownlist,来自Role(datamodel)类,数据库中也存在Roles表寄存器方法:
public class AccountController : Controller
{
//private readonly IDbContext dbContext;
//
// GET: /Account/
[HttpGet]
public ActionResult Login()
{
return View();
}
[HttpPost]
[AllowAnonymous]
public ActionResult Login(LoginModel model)
{
if(Membership.ValidateUser(model.UserName, model.Password))
{
FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
return RedirectToAction("Index", "Home");
}
ModelState.AddModelError("", "The user name or password provided is incorrect.");
return View(model);
}
[HttpGet]
public ActionResult Register()
{
string [] roles = Roles.GetAllRoles();
return View(roles);
}
[HttpPost]
public ActionResult Register(AspNetUser model)
{
return View();
}
}
在我的get方法中,我将角色
传递给view,现在我使用AspNetUser
作为view中的模型
@model Sorama.CustomAuthentiaction.Models.AspNetUser
@{
ViewBag.Title = "Register";
Layout = "~/Views/shared/_BootstrapLayout.empty.cshtml";
}
@section Styles{
<link href="@Url.Content("~/Content/bootstrap.css")" rel="stylesheet" type="text/css" />
}
<div class ="form-signin">
@using (Html.BeginForm("Login", "Account"))
{
@Html.ValidationSummary(true)
<h2 class="form-signin-heading"> Register </h2>
<div class ="input-block-level">@Html.TextBoxFor(model=>model.Email, new{@placeholder = "Email"})</div>
<div class ="input-block-level">@Html.TextBoxFor(model=>model.UserName, new{@placeholder = "UserName"})</div>
<div class ="input-block-level">@Html.PasswordFor(model=>model.Password, new{@placeholder ="Password"})</div>
<div class ="input-block-level">@Html.DropdownlistFor(.....//don't no how to generate dropdownlist)
<button class="btn btn-large btn-primary" type="submit">Sign In</button>
}
</div>
您最好有一个专门为此视图设计的视图模型。考虑视图中需要哪些信息,并定义视图模型:
public class RegisterViewModel
{
public string Email { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public string SelectedRole { get; set; }
public IEnumerable<SelectListItem> Roles { get; set; }
}
公共类RegisterViewModel
{
公共字符串电子邮件{get;set;}
公共字符串用户名{get;set;}
公共字符串密码{get;set;}
公共字符串SelectedRole{get;set;}
公共IEnumerable角色{get;set;}
}
从该视图模型中可以看到,要获得下拉列表,您需要两个属性:一个标量属性用于保存选定值,另一个集合属性用于保存可用值列表
然后:
public ActionResult Register()
{
string [] roles = Roles.GetAllRoles();
var model = new RegisterViewModel();
model.Roles = roles.Select(r => new SelectListItem
{
Value = r,
Text = r,
});
return View(model);
}
[HttpPost]
public ActionResult Register(RegisterViewModel model)
{
// the model.SelectedRole will contain the selected value from the dropdown
// here you could perform the necessary operations in order to create your user
// based on the information stored in the view model that is passed
// NOTE: the model.Roles property will always be null because in HTML,
// a <select> element is only sending the selected value and not the entire list.
// So if you intend to redisplay the same view here instead of redirecting
// makes sure you populate this Roles collection property the same way we did
// in the GET action
return Content("Thanks for registering");
}
public ActionResult寄存器()
{
字符串[]角色=角色。GetAllRoles();
var model=new RegisterViewModel();
model.Roles=Roles.Select(r=>newselectListItem
{
值=r,
Text=r,
});
返回视图(模型);
}
[HttpPost]
公共操作结果寄存器(RegisterViewModel模型)
{
//model.SelectedRole将包含从下拉列表中选择的值
//在这里,您可以执行必要的操作来创建您的用户
//基于存储在传递的视图模型中的信息
//注意:model.Roles属性将始终为null,因为在HTML中,
//元素仅发送选定值,而不是整个列表。
//因此,如果您打算在此处重新显示相同的视图,而不是重定向
//确保以与我们相同的方式填充此角色集合属性
//在行动中
返回内容(“感谢注册”);
}
最后是相应的观点:
@model RegisterViewModel
@{
ViewBag.Title = "Register";
Layout = "~/Views/shared/_BootstrapLayout.empty.cshtml";
}
@section Styles{
<link href="@Url.Content("~/Content/bootstrap.css")" rel="stylesheet" type="text/css" />
}
<div class ="form-signin">
@using (Html.BeginForm("Login", "Account"))
{
@Html.ValidationSummary(true)
<h2 class="form-signin-heading"> Register </h2>
<div class ="input-block-level">
@Html.TextBoxFor(model => model.Email, new { placeholder = "Email" })
</div>
<div class ="input-block-level">
@Html.TextBoxFor(model => model.UserName, new { placeholder = "UserName" })
</div>
<div class ="input-block-level">
@Html.PasswordFor(model => model.Password, new { placeholder = "Password" })
</div>
<div class ="input-block-level">
@Html.DropdownlistFor(model => model.SelectedRole, Model.Roles)
</div>
<button class="btn btn-large btn-primary" type="submit">Sign In</button>
}
</div>
@model RegisterViewModel
@{
ViewBag.Title=“寄存器”;
Layout=“~/Views/shared/\u BootstrapLayout.empty.cshtml”;
}
@剖面样式{
}
@使用(Html.BeginForm(“登录”、“帐户”))
{
@Html.ValidationSummary(true)
登记
@Html.TextBoxFor(model=>model.Email,新的{placeholder=“Email”})
@Html.TextBoxFor(model=>model.UserName,新的{placeholder=“UserName”})
@Html.PasswordFor(model=>model.Password,新的{placeholder=“Password”})
@DropdownlistFor(model=>model.SelectedRole,model.Roles)
登录
}
谢谢!!你的答案简直太棒了。如果在我的AspNetUser类公共虚拟ICollection角色{get{return{u Roles;}set{{u Roles=value;}}
中添加这个会更好吗?其中{u角色被设置为ICollection=new Collection()
我不知道你说的这个AspNetUser
是什么。只应将视图模型传递给视图。我已在编辑中添加了AspNetUser类。基于这个类,将它作为模型传递给view是好的,还是仍然建议使用register模型?我的意思是,如果我在我的httpPost方法中使用AspNetUser,或者我应该坚持使用基于视图的注册模型,这可能也是个好主意吗?我还没有完全理解。你应该一直使用视图模型。控制器操作将视图模型传递到视图或从视图获取视图模型。从我所看到的这个AspNetUser类是一些只应该由服务层使用的域模型。对于特定的寄存器视图,它有无数无用的东西。
@model RegisterViewModel
@{
ViewBag.Title = "Register";
Layout = "~/Views/shared/_BootstrapLayout.empty.cshtml";
}
@section Styles{
<link href="@Url.Content("~/Content/bootstrap.css")" rel="stylesheet" type="text/css" />
}
<div class ="form-signin">
@using (Html.BeginForm("Login", "Account"))
{
@Html.ValidationSummary(true)
<h2 class="form-signin-heading"> Register </h2>
<div class ="input-block-level">
@Html.TextBoxFor(model => model.Email, new { placeholder = "Email" })
</div>
<div class ="input-block-level">
@Html.TextBoxFor(model => model.UserName, new { placeholder = "UserName" })
</div>
<div class ="input-block-level">
@Html.PasswordFor(model => model.Password, new { placeholder = "Password" })
</div>
<div class ="input-block-level">
@Html.DropdownlistFor(model => model.SelectedRole, Model.Roles)
</div>
<button class="btn btn-large btn-primary" type="submit">Sign In</button>
}
</div>