如何在发布时从 EnumDropDownListFor 获取显示文本？

Question

有没有办法从枚举的 EnumDropDownListFor 助手获取 DisplayName (Text)？

枚举：

public enum PartnersGroup
{
   [Display(Name="Partner_SystemsGroup",ResourceType=typeof(Global) )]
    SystemsGroup,
   [Display(Name="Partner_SoftwarePartners",ResourceType=typeof(Global))]
    SoftwarePartners,
   [Display(Name="Partner_IntegrationPartners",ResourceType=typeof(Global))]
    IntegrationPartners,

}

模型

public class Partner
{
    public PartnersGroup PartnersGroup { get; set; }
}

控制器

// GET: Partners/Create
public ActionResult Create()
{
    ----
    return View();
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Partner partner)
{
    if (ModelState.IsValid)
    {
        // here model does not show language based text(shown in dropdown in view). Getting Enum value like "IntegrationPartners".
        // In model parner.ParnerGroup shows IntegrationPartners, but it should be "Integration Partners" in English or "Partenaires d'intégration" in French.
         // Save to DB
    }        
}

视图（创建）正在按预期显示键的基于语言的资源值。 它工作正常。

 @Html.EnumDropDownListFor(model => model.PartnersGroup)

请问有什么帮助吗？

Answer 1

您可以为 Enum 编写一个扩展方法来返回一个 Enum 值的Display值：

public static class DataAnnotationHelpers
{
    public static string GetDisplayValue(this Enum instance)
    {
        var fieldInfo = instance.GetType().GetMember(instance.ToString()).Single();
        var descriptionAttributes = fieldInfo.GetCustomAttributes(typeof(DisplayAttribute), false) as DisplayAttribute[];
        if (descriptionAttributes == null) return instance.ToString();
        return (descriptionAttributes.Length > 0) ? descriptionAttributes[0].GetName() : instance.ToString();

    }

}

并像这样使用它：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Partner partner)
{
    if (ModelState.IsValid)
    {
         var localizedDisplayName = partner.PartnersGroup.GetDisplayValue();
         // Save to DB
    }        
}

Answer 2

近似的解决方案是在合作伙伴类中添加 PartnersGroupString 属性 getter，以便将枚举转换为它们的本地化字符串。 看下面的代码

public class Partner
{
   public PartnersGroup PartnersGroup { get; set; }

   [doNotGenerateIntoDatabase]
   public string PartnersGroupString { 
  get{ 
        return  
               Strings.ResourceManager.GetString("PartnersGroup_" + this.PartnersGroup);}
   }

}

那么你可以在你的控制器中使用这个属性... model.PartnersGroupString