问题描述

我正在使用 C# 和 .NET Framework 4.6.1 开发一个 ASP.NET MVC 5 应用程序.

I'm developing an ASP.NET MVC 5 application, with C# and .NET Framework 4.6.1.

我有这个查看:

@model MyProject.Web.API.Models.AggregationLevelConfViewModel

[...]

@Html.DropDownListFor(m => m.Configurations[0].HelperCodeType, (SelectList)Model.HelperCodeTypeItems, new { id = "Configurations[0].HelperCodeType" })

ViewModel 是:

public class AggregationLevelConfViewModel
{
    private readonly List<GenericIdNameType> codeTypes;
    private readonly List<GenericIdNameType> helperCodeTypes;

    public IEnumerable<SelectListItem> CodeTypeItems
    {
        get { return new SelectList(codeTypes, "Id", "Name"); }
    }

    public IEnumerable<SelectListItem> HelperCodeTypeItems
    {
        get { return new SelectList(helperCodeTypes, "Id", "Name"); }
    }

    public int ProductionOrderId { get; set; }

    public string ProductionOrderName { get; set; }

    public IList<Models.AggregationLevelConfiguration> Configurations { get; set; }

    public AggregationLevelConfViewModel()
    {
        // Load CodeTypes to show it as a DropDownList
        byte[] values = (byte[])Enum.GetValues(typeof(CodeTypes));

        codeTypes = new List<GenericIdNameType>();
        helperCodeTypes = new List<GenericIdNameType>();

        for (int i = 0; i < values.Length; i++)
        {
            GenericIdNameType cType = new GenericIdNameType()
            {
                Id = values[i].ToString(),
                Name = EnumHelper.GetDescription((CodeTypes)values[i])
            };

            if (((CodeTypes)values[i]) != CodeTypes.NotUsed)
                codeTypes.Add(cType);

            helperCodeTypes.Add(cType);
        }
    }
}

而Models.AggregationLevelConfiguration是:

public class AggregationLevelConfiguration
{
    public byte AggregationLevelConfigurationId { get; set; }
    public int ProductionOrderId { get; set; }
    public string Name { get; set; }
    public byte CodeType { get; set; }
    public byte HelperCodeType { get; set; }
    public int PkgRatio { get; set; }
    public int RemainingCodes { get; set; }
}

我需要在这些属性中设置选定的值:

I need to set selected value in these properties:

public IEnumerable<SelectListItem> CodeTypeItems
{
    get { return new SelectList(codeTypes, "Id", "Name"); }
}

public IEnumerable<SelectListItem> HelperCodeTypeItems
{
    get { return new SelectList(helperCodeTypes, "Id", "Name"); }
}

但我无法在 new SelectList(codeTypes, "Id", "Name"); 或 new SelectList(helperCodeTypes, "Id", "Name"); 中设置它 因为选择的值在 Configurations 数组中:字段 AggregationLevelConfiguration.CodeType 和 AggregationLevelConfiguration.HelperCodeType.

But I can't set it in new SelectList(codeTypes, "Id", "Name"); or new SelectList(helperCodeTypes, "Id", "Name"); because the selected value are in Configurations array: fields AggregationLevelConfiguration.CodeType and AggregationLevelConfiguration.HelperCodeType.

我想我必须在视图中设置选定的值，但我不知道该怎么做.

I think I have to set selected value in the View, but I don't know how to do it.

如何设置选定的值?

推荐答案

不幸的是，@Html.DropDownListFor() 在循环渲染控件时的行为与其他帮助程序略有不同.这之前已在 CodePlex 上报告为问题(不确定是错误还是限制)

Unfortunately @Html.DropDownListFor() behaves a little differently than other helpers when rendering controls in a loop. This has been previously reported as an issue on CodePlex (not sure if its a bug or just a limitation)

有 2 个选项可以解决这个问题，以确保根据模型属性选择正确的选项

The are 2 option to solve this to ensure the correct option is selected based on the model property

选项 1(使用 EditorTemplate)

为集合中的类型创建一个自定义 EditorTemplate.在/Views/Shared/EditorTemplates/AggregationLevelConfiguration.cshtml中创建一个partial(注意名称必须与类型的名称匹配

Create a custom EditorTemplate for the type in the collection. Create a partial in /Views/Shared/EditorTemplates/AggregationLevelConfiguration.cshtml (note the name must match the name of the type

@model yourAssembly.AggregationLevelConfiguration
@Html.DropDownListFor(m => m.HelperCodeType, (SelectList)ViewData["CodeTypeItems"])
.... // other properties of AggregationLevelConfiguration

然后在主视图中，将 SelectList 作为 additionalViewData

and then in the main view, pass the SelectList to the EditorTemplate as additionalViewData

@using (Html.BeginForm())
{
  ...
  @Html.EditorFor(m => m.Configurations , new { CodeTypeItems = Model.CodeTypeItems })
  ...

选项2(在每次迭代中生成一个新的SelectList并设置selectedValue)

Option 2 (generate a new SelectList in each iteration and set the selectedValue)

在此选项中，您的属性 CodeTypeItems 应该是 IEnumerable，而不是 SelectList(或者只是制作 codeTypes 一个公共财产).然后在主视图中

In this option your property CodeTypeItems should to be IEnumerable<GenericIdNameType>, not a SelectList (or just make codeTypes a public property). Then in the main view

@Html.DropDownListFor(m => m.Configurations[0].HelperCodeType, new SelectList(Model.CodeTypeItems, "Id", "Name", Model.Configurations[0].HelperCodeType)

旁注:没有必要使用 new { id = "Configurations[0].HelperCodeType" - DropDownListFor() 方法已经生成了 id属性

Side note: there is no need to use new { id = "Configurations[0].HelperCodeType" - the DropDownListFor() method already generated that id attribute

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