简单的形式QUOT;为＆QUOT asp.net mvc模式的继承; [英] asp.net mvc model inheritance for "simple forms"

问题描述

你将如何实现这一点？

How would you implement this ?

我有以下型号：

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; }
}

和下面编辑模板：

EditorTemplates \\东西

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 ) %>

有关更新，我有以下的控制器方法：

For updating, I have the following controller method :

public ActionResult Update( Something model );

从技术上讲，它工作得很好。

Technically, it works very well.

更新：处理模型的不同的子类，我已经借了这样的想法：
的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应该标签和日期1间去，这种做法是行不通的，当然。这就是为什么它是简单的形式。它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,

<击>这是正确的做法，对于简单的情况下，如果编辑表单很简单？我只是想知道，如果它是正确的做这种方式。如果没有，你将如何实现这一点？

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

有一个问题，你会在运行。

There is one problem you will run in to.

在你的行动：公众的ActionResult更新（有什么模型）; 如果你调用的UpdateModel（模型）只在基类字段将被约束。结果
例如，如果模式是 SomethingStage2 标签和日期1 将被绑定，但日期2 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.

这是因为尝试/的UpdateModel 运行在编译时的类型，而不是运行时类型。结果
我就遇到了这个问题为好。我在这里张贴的解决方案：结果
<一href=\"http://stackoverflow.com/questions/3257867/mvc-2-updatemodel-on-interface-should-modelbinderattribute-be-ignored\">http://stackoverflow.com/questions/3257867/mvc-2-updatemodel-on-interface-should-modelbinderattribute-be-ignored

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:
http://stackoverflow.com/questions/3257867/mvc-2-updatemodel-on-interface-should-modelbinderattribute-be-ignored

（我假设在你所有的 Html.EditorFor 语句缺少一个右括号有错别字）

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

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