“简单形式"的asp.net mvc模型继承 [英] asp.net mvc model inheritance for "simple forms"

问题描述

您将如何实现这一点?

我有以下模型:

class Something
{
     public string Label { get; set; }
     public DateTime Date1 { get; set; }
}

class SomethingStage2 : Something
{
     public DateTime Date2 { get; set; }
}

class SomethingStage3 : SomethingStage2
{
     public DateTime Date3 { get; set; }
}

以及以下编辑器模板:

EditorTemplates\Something

EditorTemplates\Something

<%@ Control Language="C#" Inherits="ViewUserControl<Something>" %>
<%= Html.Hidden( "TypeName", Model.GetType() ) %>
<%= Html.EditorFor( x => x.Label ) %>
<%= Html.EditorFor( x => x.Date1 ) %>

EditorTemplates\SomethingStage2

EditorTemplates\SomethingStage2

<%@ Control Language="C#" Inherits="ViewUserControl<SomethingStage2>" %>
<% Html.RenderPartial("EditorTemplates/Something.ascx" %>
<%= Html.EditorFor( x => x.Date2 ) %>

EditorTemplates\SomethingStage3

EditorTemplates\SomethingStage3

<%@ Control Language="C#" Inherits="ViewUserControl<SomethingStage3>" %>
<% Html.RenderPartial("EditorTemplates/SomethingStage2.ascx" %>
<%= Html.EditorFor( x => x.Date3 ) %>

为了更新，我有以下控制器方法:

For updating, I have the following controller method :

public ActionResult Update( Something model );

从技术上讲，它运行良好.

Technically, it works very well.

更新:为了处理模型的不同子类，我借用了这个想法:http://www.codinginstinct.com/2010/03/aspnet-mvc-and-convention-based-forms.html

Update : for handling the different subclasses of the model, I've borrowed this idea : http://www.codinginstinct.com/2010/03/aspnet-mvc-and-convention-based-forms.html

public class CustomModelBinder : DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var typeName = bindingContext.ValueProvider.GetValue("TypeName");
        var type = Type.GetType(reportFormTypeName.AttemptedValue);
        var model = bindingContext.ModelMetadata.Model;
        bindingContext.ModelMetadata = new ModelMetadata(ModelMetadataProviders.Current, 
            bindingContext.ModelMetadata.ContainerType,
            () => model, type , bindingContext.ModelMetadata.PropertyName);

        return base.BindModel(controllerContext, bindingContext);
    }
}

更新:如果 Date3 应该在 Label 和 Date1 之间，这种方法当然行不通.这就是为什么它适用于简单的表格.这是一个很大的节省时间，

Update : If Date3 should go between Label and Date1, this approach won't work, of course. That's why it is for simple forms. And it is a big time saver,

对于简单的情况，编辑表单很简单，这种方法是否正确?我只是想知道这样做是否正确".如果没有，您将如何实施?

Is this approach correct, for simple cases, where edit forms are straightforward ? I'm just wondering if it is "right" to do it this way. If not, how would you implement this ?

推荐答案

您会遇到一个问题.

在您的操作中:public ActionResult Update(Something model); 如果您调用 UpdateModel(model)，则只会绑定基类中的字段.
例如，如果 model 是 SomethingStage2 Label 并且 Date1 将被绑定但 Date2> 不会.

In your action: public ActionResult Update( Something model ); if you call UpdateModel(model) only the fields in the base class will be bound.
For example, if model is a SomethingStage2 Label and Date1 will be bound but Date2 will not.

这是因为 Try/UpdateModel 对编译时类型而不是运行时类型进行操作.
我也遇到了这个问题.我在这里发布了解决方案:
接口上的MVC 2 UpdateModel，是否应该忽略ModelBinderAttribute?

This is because Try/UpdateModel operates on the compile time type and not the runtime type.
I ran into this issue as well. I posted the solution here:
MVC 2 UpdateModel on Interface, Should ModelBinderAttribute be ignored?

(我假设您所有 Html.EditorFor 语句中缺少的右括号都是拼写错误)

(I'm assuming the missing closing parens in all of your Html.EditorFor statements are typos)

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