asp.net-mvc-3 - 如何从 ModelMetadata 检索 GroupName 数据注释

Question

System.ComponentModel.DataAnnotations 中的 DisplayAttribute 有一个 GroupName 属性，它允许您在 UI 控件中将字段逻辑分组在一起(例如 WPF/WinForms 中的属性网格)。

我正在尝试在 ASP.NET MVC3 应用程序中访问此元数据，本质上是为了创建属性网格。如果我的模型看起来像这样:

public class Customer
{
    [ReadOnly]
    public int Id { get;set; }

    [Display(Name = "Name", Description = "Customer's name", GroupName = "Basic")]
    [Required(ErrorMessage = "Please enter the customer's name")]
    [StringLength(255)]
    public string Name { get;set; }

    [Display(Name = "Email", Description = "Customer's primary email address", GroupName = "Basic")]
    [Required]
    [StringLength(255)]
    [DataType(DataType.Email)]
    public string EmailAddress { get;set; }

    [Display(Name = "Last Order", Description = "The date when the customer last placed an order", GroupName = "Status")]
    public DateTime LastOrderPlaced { get;set; }

    [Display(Name = "Locked", Description = "Whether the customer account is locked", GroupName = "Status")]
    public bool IsLocked { get;set; }
}

我的观点如下:

@model Customer

<div class="edit-customer">
    @foreach (var property in ViewData.ModelMetadata.Properties.Where(p => !p.IsReadOnly).OrderBy(p => p.Order))
    {
        <div class="editor-row">
            @Html.DevExpress().Label(settings =>
                {
                    settings.AssociatedControlName = property.PropertyName;
                    settings.Text = property.DisplayName;
                    settings.ToolTip = property.Description;
                }).GetHtml()
            <span class="editor-field">
                @Html.DevExpress().TextBox(settings =>
                    {
                        settings.Name = property.PropertyName;
                        settings.Properties.NullText = property.Watermark;
                        settings.Width = 200;
                        settings.Properties.ValidationSettings.RequiredField.IsRequired = property.IsRequired;
                        settings.ShowModelErrors = true;
                    }).Bind(ViewData[property.PropertyName]).GetHtml()
            </span>
        </div>
    }
</div>

然后，表单根据元数据很好地布局，标签、工具提示、水印等都从模型的元数据中提取出来； 但是，我希望能够将这些项目分组在一起，例如在 <fieldset> 中每组。有谁知道如何从元数据中获取 GroupName，而不需要为 ModelMetadata 编写扩展方法？

Answer 1

GroupName未被 DataAnnotationsModelMetadataProvider 解析。所以没有办法直接从 ModelMetadata 中获取它。对象，即使有扩展方法。

您可以实现自己的提供程序来扩展现有提供程序以添加对 GroupName 的支持，Brad Wilson explains in his blog .

您还可以编写自己的属性，而不是使用 Display(GroupName = )并实现IMetadataAware将组名添加到 ModelMetadata.AdditionalValues 的界面.