具有自定义参数转换的 ASP.NET MVC 控制器操作? [英] ASP.NET MVC controller actions with custom parameter conversion?

问题描述

我想设置一个 ASP.NET MVC 路由，如下所示:

I want to set up a ASP.NET MVC route that looks like:

routes.MapRoute(
  "Default", // Route name
  "{controller}/{action}/{idl}", // URL with parameters
  new { controller = "Home", action = "Index", idl = UrlParameter.Optional } // Parameter defaults
);

路由看起来像这样的请求...

That routes requests that look like this...

Example/GetItems/1,2,3

...到我的控制器操作:

...to my controller action:

public class ExampleController : Controller
{
    public ActionResult GetItems(List<int> id_list)
    {
        return View();
    }
}

问题是，我应该设置什么来将 idl url 参数从 string 转换为 List<int> 并调用适当的控制器操作?

The question is, what do I set up to transform the idl url parameter from a string into List<int> and call the appropriate controller action?

我在这里看到了一个 相关问题，它使用了 OnActionExecuting 预处理一个字符串，但没有改变类型.我不认为这对我有用，因为当我在控制器中覆盖 OnActionExecuting 并检查 ActionExecutingContext 参数时，我看到 ActionParameters 字典已经有一个带有 null 值的 idl 键 - 大概是从字符串到 List<int> 的尝试转换......这是路由的一部分我想要控制.

I have seen a related question here that used OnActionExecuting to preprocess a string, but did not change the type. I don't think that will work for me here, because when I override OnActionExecuting in my controller and inspect the ActionExecutingContext parameter, I see that the ActionParameters dictionary already has an idl key with a null value- presumably, an attempted cast from string to List<int>... this is the part of the routing I want to be in control of.

这可能吗?

推荐答案

一个不错的版本是实现你自己的 Model Binder.您可以在 这里找到一个示例

A nice version is to implement your own Model Binder. You can find a sample here

我试着给你一个想法:

public class MyListBinder : IModelBinder
{   
     public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
     {   
        string integers = controllerContext.RouteData.Values["idl"] as string;
        string [] stringArray = integers.Split(',');
        var list = new List<int>();
        foreach (string s in stringArray)
        {
           list.Add(int.Parse(s));
        }
        return list;  
     }  
}


public ActionResult GetItems([ModelBinder(typeof(MyListBinder))]List<int> id_list) 
{ 
    return View(); 
} 

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