DropDownListFor结合模型 [英] DropDownListFor binding to model

问题描述

我是新来asp.net MVC和尽管一些搜索不能成功地让我的头围绕在视图下拉列表。

具体我创建一个项目，首先是实体框架code。

我有要求用户有选择地挑选他们有牌照类型的表单。

和帮助或援助将大大AP preciated。我期待在视图中创建一个DropDownListFor帮手，使下拉列表中LicenceType。

有关许可证类型的GRCMember模型部分是：

 公共类GRCMember
{
    [专栏（类型名=INT）]
    公众诠释？ LicenceTypeId {搞定;组; }
}
 

该牌照类型型号是：

 公共类LicenceType
{
    公众诠释LicenceTypeId {搞定;组; }
    [StringLength（150）]
    [专栏（类型名=nvarchar的）]
    公共字符串类型{搞定;组; }
    [专栏（类型名=位）]
    公共BOOL？蛰伏{搞定;组; }
    公共虚拟的ICollection＆LT; GRCMember＆GT; GRCMembers {搞定;组; }
}
 

相关寄存器视图模型部分：

 公共类RegisterViewModel
{
    [显示（NAME =牌照类型）]
    公众诠释？ SelectedLicenceTypeId {搞定;组; }
}
 

的get控制器的方法是：

  [使用AllowAnonymous]
[HTTPGET]
公众的ActionResult寄存器（）
{
    返回查看（）;
}
 

最后下拉视图的部分：

  @model GRCWebApp.Models.RegisterViewModel
＆LT; D​​IV CLASS =COL-MD-3 COL-MD-偏移1＆GT;
    @ Html.LabelFor（型号=＆GT; model.SelectedLicenceTypeId，htmlAttributes：新{@class =控制标签}）
    @ Html.EditorFor（型号=＆GT; model.SelectedLicenceTypeId，新{htmlAttributes = {新@class =表格控}}）
    @ Html.ValidationMessageFor（型号=＆GT; model.SelectedLicenceTypeId，新{@class =TEXT-危险}）
＆LT; / DIV＆GT;
 

解决方案

让我们假设你有两个实体称为Person和城市。然后，你会为了填充模型中的这两个实体使用视图模型如下图所示：

PersonViewModel：

 公众人物的人获得{;组; }
公共IEnumerable的＆LT;城市＆GT;城市{搞定;组; }
 

当然，控制器返回视图模型：

控制器：

 公开的ViewResult的Create（）
{
    PersonViewModel模式=新PersonViewModel
    {
        人=新的Person（）
        城市= repository.Cities.ToList（）
    };
    返回查看（模型）;
}
 

你应该通过视图模型到您的视图，然后使用DROPDOWNLIST，如下图所示：

查看：

  @model Project.WebUI.Models.PersonViewModel
...
@ Html.LabelFor（M = GT; m.Person.City）
@ Html.DropDownListFor（M =＆GT; m.Person.City，新的SelectList（Model.CitiesCityID，CITYNAME），----选择----）
 

希望这有助于...

I am new to asp.net mvc and despite several searches can't get my head successfully around drop down lists in a view.

Specifically I'm creating a project that is entity framework code first.

I have a form that requires the user to optionally pick the Licence Type they have.

And help or assistance would be greatly appreciated. I'm looking to create a DropDownListFor helper in the view to enable the drop down list for LicenceType.

The GRCMember model section relating to licence type is:

public class GRCMember
{
    [Column(TypeName = "int")]
    public int? LicenceTypeId { get; set; }
}

The Licence Type Model is:

public class LicenceType
{
    public int LicenceTypeId { get; set; }
    [StringLength(150)]
    [Column(TypeName = "nvarchar")]
    public String Type { get; set; }
    [Column(TypeName = "bit")]
    public bool? Dormant { get; set; }
    public virtual ICollection<GRCMember> GRCMembers { get; set; }
}

The associated Register View Model section is:

public class RegisterViewModel
{
    [Display(Name = "Licence Type")]
    public int? SelectedLicenceTypeId { get; set; }
}

The get controller method is:

[AllowAnonymous]
[HttpGet]
public ActionResult Register()
{
    return View();
}

And finally the drop down section of the view is:

@model GRCWebApp.Models.RegisterViewModel
<div class="col-md-3 col-md-offset-1">
    @Html.LabelFor(model => model.SelectedLicenceTypeId, htmlAttributes: new { @class = "control-label" })
    @Html.EditorFor(model => model.SelectedLicenceTypeId, new { htmlAttributes = new { @class = "form-control" } })
    @Html.ValidationMessageFor(model => model.SelectedLicenceTypeId, "", new { @class = "text-danger" })
</div>

解决方案

Let's assume that you have two entities called Person and City. Then you would use a ViewModel in order to populate these two entities in a model as shown below:

PersonViewModel:

public Person Person { get; set; }
public IEnumerable<City> Cities { get; set; }

The controller of course returns the ViewModel:

Controller:

public ViewResult Create()
{
    PersonViewModel model = new PersonViewModel
    {
        Person = new Person (),
        Cities = repository.Cities.ToList()
    };
    return View(model);
}

You should pass the ViewModel to your View and then use the Dropdownlist as shown below:

View:

@model Project.WebUI.Models.PersonViewModel
...
@Html.LabelFor(m => m.Person.City)
@Html.DropDownListFor(m => m.Person.City, new SelectList(Model.Cities, "CityID", "CityName"), "---- Select ----")

Hope this helps...

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