自定义模型绑定从DefaultModelBinder继承 [英] Custom Model Binder inheriting from DefaultModelBinder
问题描述
我试图建立MVC 4自定义模型绑定将从 DefaultModelBinder
继承。我想它在拦截任何接口的任何的结合水平,并试图从名为 AssemblyQualifiedName
一个隐藏字段加载所需的类型。
I'm attempting to build a custom model binder for MVC 4 that will inherit from DefaultModelBinder
. I'd like it to intercept any interfaces at any binding level and attempt to load the desired type from a hidden field called AssemblyQualifiedName
.
下面是我到目前为止(简体):
Here's what I have so far (simplified):
public class MyWebApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
ModelBinders.Binders.DefaultBinder = new InterfaceModelBinder();
}
}
public class InterfaceModelBinder : DefaultModelBinder
{
public override object BindModel(ControllerContext controllerContext,
ModelBindingContext bindingContext)
{
if (bindingContext.ModelType.IsInterface
&& controllerContext.RequestContext.HttpContext.Request.Form.AllKeys.Contains("AssemblyQualifiedName"))
{
ModelBindingContext context = new ModelBindingContext(bindingContext);
var item = Activator.CreateInstance(
Type.GetType(controllerContext.RequestContext.HttpContext.Request.Form["AssemblyQualifiedName"]));
Func<object> modelAccessor = () => item;
context.ModelMetadata = new ModelMetadata(new DataAnnotationsModelMetadataProvider(),
bindingContext.ModelMetadata.ContainerType, modelAccessor, item.GetType(), bindingContext.ModelName);
return base.BindModel(controllerContext, context);
}
return base.BindModel(controllerContext, bindingContext);
}
}
例Create.cshtml文件(简体):
Example Create.cshtml file (simplified):
@model Models.ScheduledJob
@* Begin Form *@
@Html.Hidden("AssemblyQualifiedName", Model.Job.GetType().AssemblyQualifiedName)
@Html.Partial("_JobParameters")
@* End Form *@
以上部分 _JobParameters.cshtml
着眼于 Model.Job
的属性并建立编辑控件,类似于 @ Html.EditorFor()
,但也有一些额外的标记。在 ScheduledJob.Job
属性类型 IJob
(接口)。
The above partial _JobParameters.cshtml
looks at the Model.Job
's properties and builds the edit controls, similar to @Html.EditorFor()
, but with some extra markup. The ScheduledJob.Job
property is of type IJob
(interface).
例ScheduledJobsController.cs(简体):
Example ScheduledJobsController.cs (simplified):
[HttpPost]
public ActionResult Create(ScheduledJob scheduledJob)
{
//scheduledJob.Job here is not null, but has only default values
}
当我保存的形式,它除$ P $点对象的类型正确,并得到一个新的实例,但对象的属性不被设置为它们的相应的值。
When I save the form, it interprets the object type correctly and gets a new instance, but the properties of the object are not being set to their appropriate values.
还有什么我需要做的这告诉默认联接管财产指定类型的绑定?
What else do I need to do to this to tell the default binder to take over the property binding of the specified type?
推荐答案
<一个href=\"http://ivonna.biz/blog/2012/2/2/custom-aspnet-model-binders-series,-part-3-subclassing-your-models.aspx\">This文章给我看,我是模型绑定过于复杂。下面code工作:
This article showed me that I was over-complicating the model binder. The following code works:
public class InterfaceModelBinder : DefaultModelBinder
{
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
if (bindingContext.ModelType.IsInterface)
{
Type desiredType = Type.GetType(
EncryptionService.Decrypt(
(string)bindingContext.ValueProvider.GetValue("AssemblyQualifiedName").ConvertTo(typeof(string))));
bindingContext.ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(null, desiredType);
}
return base.BindModel(controllerContext, bindingContext);
}
}
这篇关于自定义模型绑定从DefaultModelBinder继承的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!