ModelBinder的未调用 [英] ModelBinder is not invoked

问题描述

previous问题，我实现了一个映射 / API / V1 /部件/ 1,2,3 到

Per my previous question, I implemented a model binder that maps /api/v1/widgets/1,2,3 to

// WidgetsController.cs: 
public ActionResult Show(IEnumerable<int> idArgs)
{

}

这是工作了一段时间，但现在是没有任何更长的时间。 我ModelBinder的甚至没有被所有调用。：当我的行为被调用时， idArgs 的空列表的价值，即使我设置其在路由，这表明，我认为默认的模型绑定认为它是从什么地方得到的值默认值空。自上周以来，我做的时候，它正在唯一的变化是，previously，我呼吁我的行动 ShowMany。从那以后，我把它重命名为显示。谁能帮我弄清楚为什么没有被调用我的ModelBinder的？

This was working for a while, but now it is not any longer. My ModelBinder is not even being invoked at all. When my action is invoked, idArgs has a value of the empty list, even if I set its default value to null in the route, which suggests to me that the default model binder thinks it's getting a value from somewhere. The only change I've made since last week when it was working is that previously, I had called my action ShowMany. Since then, I renamed it to Show. Can anyone help me figure out why my ModelBinder is not being invoked?

在的global.asax.cs，我有

In global.asax.cs, I have

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    RegisterRoutes(RouteTable.Routes);
    ValueProviderFactories.Factories.Add(new JsonValueProviderFactory());

    ModelBinders.Binders.Add(typeof(IEnumerable<int>), new IEnumerableOfIntCSVModelBinder());
}

和路线看起来像这样（我已经验证正在使用这条路线）：

And the route looks like this (I have verified that this route is being used):

context.MapRoute(
    "show",
    "api/{controller}/{idArgs}",
    new { action = "show" },
    new { httpMethod = new HttpMethodConstraint("GET"), idArgs = @"^(\d+,)+\d+,?$" }
);

---

编辑：我试图搞乱一些与搞乱航线，以及注释掉 JsonValueProvider ，我依然得到一个空数组。在我的控制器，我可以做

---

I've tried messing messing with the routes some more, as well as commenting out the JsonValueProvider, and I'm still getting an empty array. In my controller, I can do

var ids = RouteData.Values["idArgs"];

和得到字符串1,2,3。如果只有框架将它传递给我的ModelBinder的，我会ModelBinder的把它变成了的IEnumerable 。

and get the string "1,2,3". If only the framework would pass this to my ModelBinder, my ModelBinder would turn it into the IEnumerable.

我使用AutoFac。有没有可能是AutoFac注入空数组到我的控制器的方法？我已经没有问题，这样在其他地方（我们在这个项目中使用AutoFac无处不在。）

I am using AutoFac. Is it possible that AutoFac is injecting an empty array into my controller method? I haven't had problems like this in other places (and we use AutoFac everywhere in this project.)

EDIT2 ：我也试过装潢均 idArgs 操作参数，以及与控制器 [ModelBinder的（typeof运算（ IEnumerableOfIntCSVModelBinder））] ，但这没有影响。

Edit2: I also tried decorating both the idArgs action parameter, and the controller with [ModelBinder(typeof(IEnumerableOfIntCSVModelBinder))], but this had no effect.

推荐答案

我看到你有一个 JsonValueProviderFactory 中加入你的的Application_Start 。也许有东西在这个工厂$ P $的实施pvents被击中模型绑定？

I see that you have a JsonValueProviderFactory added in your Application_Start. Maybe there is something in the implementation of this factory that prevents the model binder from being hit?

另外你已经证明了网址 / API / V1 /部件/ 1,2,3 没有任何关系的路由定义，你有 RESTAPI / {控制器} / {} idArgs。

Also the url you have shown /api/v1/widgets/1,2,3 has no relation to the route definition that you have "restapi/{controller}/{idArgs}".

这篇关于ModelBinder的未调用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！