路由到同名但参数不同的动作 [英] Routing to the actions with same names but different parameters

问题描述

我有这组路线:

        routes.MapRoute(
            "IssueType",
            "issue/{type}",
            new { controller = "Issue", action = "Index" }
        );

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

这是控制器类:

public class IssueController : Controller
{
    public ActionResult Index()
    {
        // todo: redirect to concrete type
        return View();
    }

    public ActionResult Index(string type)
    {
        return View();
    }
}

为什么，当我请求 http://host/issue 我得到 当前的操作请求'索引' 在控制器类型 'IssueController' 上的以下操作方法之间存在歧义:
我希望第一个方法应该在没有参数时起作用，而第二个方法应该在指定参数时起作用.

why, when i request http://host/issue i get The current request for action 'Index' on controller type 'IssueController' is ambiguous between the following action methods:
I expect that first one method should act when there is no parameters, and second one when some parameter specified.

我哪里做错了?

UPD:可能重复:你能在 ASP.NET MVC 中重载控制器方法吗?

UPD 2:由于上面的链接 - 没有任何合法的方法可以使动作重载，是吗?

UPD 2: due to the link above - there is no any legal way to make action overloading, is it?

UPD 3:动作方法不能基于参数重载 (c) http://msdn.microsoft.com/en-us/library/system.web.mvc.controller%28VS.100%29.aspx

UPD 3: Action methods cannot be overloaded based on parameters (c) http://msdn.microsoft.com/en-us/library/system.web.mvc.controller%28VS.100%29.aspx

推荐答案

我会有一个查找有效类型变量的 Index 方法

I would have one Index method that looks for a valid type variable

    public class IssueController : Controller  
{  
    public ActionResult Index(string type)  
    {  
        if(string.isNullOrEmpty(type)){
            return View("viewWithOutType");}
        else{
            return View("viewWithType");} 
    }
}

如何创建一个自定义属性来查找特定请求值，如这篇文章 堆栈溢出

How about creating a custom attribute that looks for a specific request value as in this post StackOverflow

[RequireRequestValue("someInt")] 
public ActionResult MyMethod(int someInt) { /* ... */ } 

[RequireRequestValue("someString")] 
public ActionResult MyMethod(string someString) { /* ... */ } 

public class RequireRequestValueAttribute : ActionMethodSelectorAttribute { 
    public RequireRequestValueAttribute(string valueName) { 
        ValueName = valueName; 
    } 
    public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) { 
        return (controllerContext.HttpContext.Request[ValueName] != null); 
    } 
    public string ValueName { get; private set; } 
} 

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