Question

我目前正在开发一个项目，需要为一个客户端添加多个地址。我有三个型号：这是我的班级图表的链接：http://sdrv.ms/1fWioA2

人物模型：

public class Person
{    
    public Person()
    {
        this.Adresses = new HashSet<Address>();
    }

    public int PersonID { get; set; }

    [Required(ErrorMessage = "Name is required")]
    public string Name { get; set; }

    [Required(ErrorMessage = "Email Address is required")]
    [DisplayName("Email Address")]
    //[RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}",
    //ErrorMessage = "Email is is not valid.")]
    [DataType(DataType.EmailAddress)]
    public string Email { get; set; }

    public string Mobile { get; set; }
    public string Phone { get; set; }
    public string Fax { get; set; }

    public virtual ICollection<Address> Adresses { get; set; }
}

地址：

public class Address
{
    [HiddenInput(DisplayValue = false)]
    public int ID { get; set; }
    public string Street { get; set; }
    public string Building  { get; set; }

    public int PersonID { get; set; }
    public int CityID { get; set; }

    public virtual City City { get; set; }
    public virtual Person Person { get; set; }
}

我创建了modelview以绑定到我的Create视图：

public class PersonViewModel
{
    public Person Person { get; set; }
    public ICollection<Address> Adresses { get; set; }
}

我的问题是如何将viewmodel绑定到create视图，以便能够为同一个Person保存多个地址？

Answer 1

为此，请在/Shared/Editor中创建一个名为Address.cshtml的编辑器模板：

@model Address

<div class="address">
@Html.HiddenFor(model => model.ID)
@Html.HiddenFor(model => model.PersonID)
@Html.HiddenFor(model => model.CityID)
@Html.TextBoxFor(model => model.Street) <br />
@Html.TextBoxFor(model => model.Building  ) <br />
</div>

现在，在您的View中，您需要做的就是：

@Html.EditorFor(v => v.Addresses)

这将创建如下的表单字段：

<input type="hidden" name="address[0].Id" />
<input type="hidden" name="address[0].PersonId" />
<input type="hidden" name="address[0].CityId" />
<input type="text" name="address[0].Street" />
<input type="text" name="address[0].Building" />
<input type="hidden" name="address[1].Id" />
<input type="hidden" name="address[1].PersonId" />
<input type="hidden" name="address[1].CityId" />
<input type="text" name="address[1].Street" />
<input type="text" name="address[1].Building" />

模型绑定将看到这些字段符合ASP.Net Wire Format，并将这些字段的值绑定到一组地址中。参考：http://www.hanselman.com/blog/ASPNETWireFormatForModelBindingToArraysListsCollectionsDictionaries.aspx

如果您使用Javascript开始摆弄字段，请小心。如果动态添加或删除地址块，则必须确保将索引重置为从零开始，并且索引始终递增1。

Answer 2

我建议您使用基于客户端的方法使用knockout作为示例：服务器端：

 public class HomeController : Controller
{
    //
    // GET: /Home/

    public ActionResult Index()
    {
        var model = new
        {
            person = new { firstName = "123", secondName = "" },
            addresses = new dynamic[1] { new { street = "", building = "", selectedCityId = "" } },
            cities = new dynamic[2] { new { cityName = "Kiev", cityId = "1" }, new { cityName = "Moskow", cityId = "2" } }

        };
        return View(model);
    }

    public ActionResult Save(YourType model)
    {
        ..... 
    }

}

客户方：

@{
Layout = null;
}
@using Newtonsoft.Json;

<!DOCTYPE html>

<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
<div style="margin-left:100px">
    <p>First name:</p>
    <input data-bind="value:person.firstName" />

    <p>Second name:</p>
    <input data-bind="value:person.secondName" />
    <h3>Addresses</h3>
    <div data-bind="foreach:addresses">
        <p>
            Street
        </p>
        <input data-bind="value:street" />
        <p>
            Building
        </p>
        <input data-bind="value:building" />
        <p>
            City
        </p>
        <select data-bind="options: $parent.cities, optionsText: 
           'cityName',optionsValue:'cityId',
              value: selectedCityId , optionsCaption: 'Choose...'"></select>
        <div>
            <div style="float:left;">
                <button data-bind="click:$parent.add">
                    Add
                </button>
            </div>
            <div style="float:left;">
                <button data-bind="click: $parent.remove">
                    Delete
                </button>
            </div>
        </div>
        <div style="clear:both"></div>
    </div>
    <button style="width:100px"data-bind="click:save">
        Save
    </button>

 </div>
 <script src="~/Scripts/jquery-1.8.2.js"></script>
 <script src="~/Scripts/knockout-3.0.0.js"></script>
 <script src="~/Scripts/knockout.mapping-latest.js"></script>
 <script type="text/javascript">
    //This create javascript object from your model
    var personModel=@Html.Raw(JsonConvert.SerializeObject(Model))
    //Parse javascript object to knockout viewModel
    var viewModel=ko.mapping.fromJS(personModel);
    // Create new address
    function Address(){
        this.selectedCityId=ko.observable("");
        this.street=ko.observable("");
        this.building=ko.observable("");
    }
    //Add new address
    viewModel.add=function(){
        viewModel.addresses.push(new Address());

    };
    //Remove address
    viewModel.remove =function(item){
        if(viewModel.addresses().length>1){
            viewModel.addresses.remove(item)
        }         
    };
    //save model
    viewModel.save=function(){
        unmapped=ko.mapping.toJSON(viewModel);
        $.post('/home/save',unmapped)
    };

    ko.applyBindings(viewModel);
</script>
</body>
</html>

这里有一些链接http://blog.stevensanderson.com/2010/07/12/editing-a-variable-length-list-knockout-style/也使用这种方法。

create action方法中的一对多关系

2 个答案: