对派生的mvc模型使用单一视图 [英] Using a single view for derived mvc models

问题描述

我有一个基本模型类NotificationBase和两个派生模型GeneralNotification和ReleaseNotification.

I have a base model class, NotificationBase, and two derived models, GeneralNotification and ReleaseNotification.

public class NotificationBase
{
        public int Id { get; set; }

        [Required]
    [StringLength(50, ErrorMessage="Title must not exceed 50 characters.")]
    public string Title { get; set; }

    [Required(ErrorMessage="Type is required.")]
    public int TypeId { get; set; }

    [Required(ErrorMessage="Importance is required.")]
    public int ImportanceId { get; set; }

    public DateTime Created {get; set; }

    [Required(ErrorMessage="Start date is required.")]        
    public DateTime StartDate { get; set; }

    [Required(ErrorMessage="End date is required")]
    public DateTime EndDate { get; set; }

    [AllowHtml]
    [Required(ErrorMessage="Details are required")]
    public string Details { get; set; }                

}

public class GeneralNotification : NotificationBase
{
    [Required(ErrorMessage="Message is required.")]
    [StringLength(50, ErrorMessage = "Message must be maximum 50 chararacters long.")]
    public string Message { get; set; } 
}

  public class ReleaseNotification : NotificationBase
{
    [Required(ErrorMessage="Version is required.")]
    public string Version { get; set; }
}

我正在尝试使用单个编辑视图来编辑两种派生的通知类型.

I'm trying to use a single edit view to edit both derived notification types.

此视图具有NotificationBase类型的模型.

This view has a model of type NotificationBase.

问题是我无法将派生类型的添加属性显示在编辑视图中.发送基本类型的模型意味着我一路上会失去派生类型的额外属性.

The problem is I can't get the added properties of the derived types to be displayed in the edit view. Sending a model of the base type means I lose along the way the extra properties of the derived types.

是否有解决方法，或者我只需要为每个派生模型制作单独的视图?

Is there a workaround, or I just have to make separate views for each derived model ?

推荐答案

您可以在视图中添加几个条件.假设您的视图是使用基类强类型化的:

You can add a couple of conditions to your view. Suppose your view is strongly typed with base class:

@model NotificationBase

您可以检查每个子类并添加相应的字段(下面的未调试代码！):

You can check for each subclass and add corresponding fields (untested code below!):

@if (Model is GeneralNotification)
{
    Html.TextBoxFor(m => ((GeneralNotification) m).Message);
}

第二个子类型当然也是如此:

The same goes for second subtype of course:

@if (Model is ReleaseNotification)
{
    Html.TextBoxFor(m => ((ReleaseNotification) m).Version);
}

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