Question

我有公司，国家和州级课程。国家与国家有关州和国家是公司的外键

问题公司视图将州和国家/地区显示为单独的下拉列表。 但我希望当我选择State时，相应的Country应该更改，反之亦然。这在MVC5 EF模型中是否可行。

公司类

public class Company
{
    public int CompanyID { get; set; }
    [Required]
    [StringLength(100,MinimumLength=3)]
    public string Name { get; set; }
    [StringLength(200)]
    public string Address { get; set; }
    public int? StateID { get; set; }
    public virtual State State { get; set; }
    public int? CountryID { get; set;}
    public virtual Country Country { get; set; }
    public int CompanyTypeID { get; set; }
    public virtual CompanyType CompanyType { get; set; }

}

国家/地区

public class Country
{
    public int CountryID { get; set; }
    [Required]
    [StringLength(100)]
    public string Name { get; set; }
    public virtual ICollection<State> States { get; set; }
    public virtual ICollection<Company> Companies { get; set; }
}

州级

public class State
{
    public int StateID { get; set; }
    [Required]
    [StringLength(100)]
    public string Name { get; set; }
    public int CountryID { get; set; }
    public virtual Country Country { get; set; }

    public virtual ICollection<Company> Companies { get; set; }

}

我有脚手架并生成视图和公司视图以供参考

@using (Html.BeginForm()) {
@Html.AntiForgeryToken()

<div class="form-horizontal">
    <h4>Company</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.Address, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Address, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Address, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.StateID, "StateID", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownList("StateID", null, htmlAttributes: new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.StateID, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.CountryID, "CountryID", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownList("CountryID", null, htmlAttributes: new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.CountryID, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.CompanyTypeID, "CompanyTypeID", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownList("CompanyTypeID", null, htmlAttributes: new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.CompanyTypeID, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="Create" class="btn btn-default" />
        </div>
    </div>
</div> } <div> @Html.ActionLink("Back to List", "Index")

@section Scripts {@ Scripts.Render（＆＃34;〜/ bundles / jqueryval＆＃34;）}

任何帮助将不胜感激

Answer 1

您需要的是级联下拉列表。以下是CodeProject的示例。

http://www.codeproject.com/Articles/258172/Simple-Implementation-of-MVC-Cascading-Ajax-Drop-D

Answer 2

这在MVC5 EF模型中是否可行。

是。但是你需要做这项工作（或获得（购买）控制权来为你做这件事。）

限制不是MVC，而是默认的HTML控件没有依赖于另一个的概念。在国家/地区下拉更改时编写代码以更改State下拉内容（这可能包括按所选国家/地区过滤状态列表），或者获取第三方控制权（这是常见的要求，因此很多控制¹）。

¹但Stack Overflow没有提供工具建议。

帐户的ASP.NET MVC5实体框架组字段（国家/地区）

公司类

2 个答案: