asp.net mvc 路由id参数 [英] asp.net mvc routing id parameter

问题描述

我正在使用 asp.net mvc 开发一个网站.我有路线

I am working on a website in asp.net mvc. I have a route

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

这是默认路由.我有一个方法

which is the default route. And I have a method

public ActionResult ErrorPage(int errorno)
{
    return View();
}

现在，如果我想用 http://something/mycontroller/Errorpage/1 运行此代码它不起作用.但是如果我将参数名称从 errorno 更改为 id有用.

Now if I want to run this code with http://something/mycontroller/Errorpage/1 it doesn't work. But if I change the parameter name to id from errorno it works.

此方法是否必须具有相同的参数名称?或者我是否需要为这种情况创建单独的路由?

Is it compulsory to have same parameter name for this method? Or do I need to create separate routes for such situations?

推荐答案

因此，您有一个名为 errorno 的参数，并且您希望它具有来自参数 id 的值>.这显然是绑定问题.

So, you have a parameter named errorno, and you want it to have a value from parameter id. This is obviously the binding problem.

如何解决:

1. 为模型绑定器创建一个类:

1. create a class for model binder:

public class ParameterBinder : IModelBinder
{
    public string ActualParameter { get; private set; }

    public ParameterBinder(string actualParameter)
    {
        this.ActualParameter = actualParameter;
    }

    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        object id = controllerContext.RouteData.Values[this.ActualParameter];
        return id;
    }
}

为自定义模型绑定创建自定义属性:

create a custom attribute for custom model binding:

[AttributeUsage(AttributeTargets.Parameter)]
public class BindParameterAttribute : CustomModelBinderAttribute
{
    public string ActualParameter { get; private set; }

    public BindParameterAttribute(string actualParameter)
    {
        this.ActualParameter = actualParameter;
    }

    public override IModelBinder GetBinder()
    {
        return new ParameterBinder(this.ActualParameter);
    }
}

根据需要将新属性应用于您的操作参数:

apply the new attribute to your action parameters as needed:

public ActionResult ErrorPage(
[BindParameter("id")]
int errorno)
{
    return View();
}

现在您的 errorno 将具有作为 id 传递给您的 url 的值.

Now your errorno will have the value, which was passed as id for your url.

注意:您可以从上面的示例中删除参数 id，如果您确定只需要为 id 解决它.

Note: you can remove the paramter id from the example above, if you are sure you need it solved only for id.

离开这种方式也将允许您绑定其他参数.

Leaving this way will allow you bind other parameters too.

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